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#include <iostream>
#include <fstream>
#include <stdlib.h>
#include <time.h>
#include <random>
 
using namespace std;
 
int main()
{
    random_device rd;
    mt19937 gen(rd());
    uniform_int_distribution<> dis(100000, 999999);
    ofstream gen;
    gen.open ("brojevi.txt");
    for (int i = 0; i < 50; i++)
    {
		int randomX = dis(gen);
    	gen << randomX;
    	gen << " ";
    }
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:14:14: error: conflicting declaration ‘std::ofstream gen’
     ofstream gen;
              ^~~
prog.cpp:12:13: note: previous declaration as ‘std::mt19937 gen’
     mt19937 gen(rd());
             ^~~
prog.cpp:15:9: error: ‘std::mt19937 {aka class std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ has no member named ‘open’
     gen.open ("brojevi.txt");
         ^~~~
prog.cpp:19:10: error: no match for ‘operator<<’ (operand types are ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ and ‘int’)
      gen << randomX;
      ~~~~^~~~~~~~~~
In file included from /usr/include/c++/6/string:52:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:5340:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator<<(basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5340:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/bits/ios_base.h:46:0,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/system_error:209:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::error_code&)
     operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
     ^~~~~~~~
/usr/include/c++/6/system_error:209:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:497:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)
     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
     ^~~~~~~~
/usr/include/c++/6/ostream:497:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:502:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)
     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
     ^~~~~~~~
/usr/include/c++/6/ostream:502:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:508:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, char)
     operator<<(basic_ostream<char, _Traits>& __out, char __c)
     ^~~~~~~~
/usr/include/c++/6/ostream:508:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<char, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:514:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, signed char)
     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
     ^~~~~~~~
/usr/include/c++/6/ostream:514:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<char, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:519:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, unsigned char)
     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
     ^~~~~~~~
/usr/include/c++/6/ostream:519:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<char, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:539:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
     ^~~~~~~~
/usr/include/c++/6/ostream:539:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/ostream:638:0,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/ostream.tcc:321:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const char*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
     ^~~~~~~~
/usr/include/c++/6/bits/ostream.tcc:321:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:556:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char*)
     operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
     ^~~~~~~~
/usr/include/c++/6/ostream:556:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<char, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:569:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const signed char*)
     operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
     ^~~~~~~~
/usr/include/c++/6/ostream:569:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<char, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:574:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const unsigned char*)
     operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
     ^~~~~~~~
/usr/include/c++/6/ostream:574:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<char, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:628:5: note: candidate: template<class _CharT, class _Traits, class _Tp> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&)
     operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     ^~~~~~~~
/usr/include/c++/6/ostream:628:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:49:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.h:1269:5: note: candidate: template<class _RandomNumberEngine, long unsigned int __w, class _UIntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::independent_bits_engine<_RandomNumberEngine, __w, _UIntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.h:1269:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:477:5: note: candidate: template<class _UIntType1, long unsigned int __w1, long unsigned int __n1, long unsigned int __m1, long unsigned int __r1, _UIntType1 __a1, long unsigned int __u1, _UIntType1 __d1, long unsigned int __s1, _UIntType1 __b1, long unsigned int __t1, _UIntType1 __c1, long unsigned int __l1, _UIntType1 __f1, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::mersenne_twister_engine<_UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:477:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:877:5: note: candidate: template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::uniform_int_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:877:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:936:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::uniform_real_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:936:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2123:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::cauchy_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2123:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:998:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::bernoulli_distribution&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:998:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1898:5: note: candidate: template<class _RealType1, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::normal_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1898:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1080:5: note: candidate: template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::geometric_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1080:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2444:5: note: candidate: template<class _RealType1, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::gamma_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2444:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1731:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::exponential_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1731:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2522:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::weibull_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2522:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2598:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::extreme_value_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2598:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:156:5: note: candidate: template<class _UIntType, _UIntType __a, _UIntType __c, _UIntType __m, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::linear_congruential_engine<_UIntType, __a, __c, __m>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:156:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:632:5: note: candidate: template<class _UIntType, long unsigned int __w, long unsigned int __s, long unsigned int __r, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::subtract_with_carry_engine<_UIntType, __w, __s, __r>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:632:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:702:5: note: candidate: template<class _RandomNumberEngine, long unsigned int __p, long unsigned int __r, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::discard_block_engine<_RandomNumberEngine, __p, __r>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:702:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:831:5: note: candidate: template<class _RandomNumberEngine, long unsigned int __k, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::shuffle_order_engine<_RandomNumberEngine, __k>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:831:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1195:5: note: candidate: template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::negative_binomial_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1195:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1400:5: note: candidate: template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::poisson_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1400:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1667:5: note: candidate: template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::binomial_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1667:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1963:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::lognormal_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1963:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2036:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::chi_squared_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2036:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2200:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::fisher_f_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2200:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2275:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::student_t_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2275:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2734:5: note: candidate: template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::discrete_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2734:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2944:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::piecewise_constant_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2944:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:3160:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::piecewise_linear_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:3160:5: note:   template argument deduction/substitution failed:
prog.cpp:19:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << randomX;
             ^~~~~~~
prog.cpp:20:10: error: no match for ‘operator<<’ (operand types are ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ and ‘const char [2]’)
      gen << " ";
      ~~~~^~~~~~
In file included from /usr/include/c++/6/string:52:0,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/basic_string.h:5340:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
     operator<<(basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/basic_string.h:5340:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/bits/ios_base.h:46:0,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/system_error:209:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::error_code&)
     operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
     ^~~~~~~~
/usr/include/c++/6/system_error:209:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:497:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)
     operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
     ^~~~~~~~
/usr/include/c++/6/ostream:497:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:502:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)
     operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
     ^~~~~~~~
/usr/include/c++/6/ostream:502:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:508:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, char)
     operator<<(basic_ostream<char, _Traits>& __out, char __c)
     ^~~~~~~~
/usr/include/c++/6/ostream:508:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<char, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:514:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, signed char)
     operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
     ^~~~~~~~
/usr/include/c++/6/ostream:514:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<char, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:519:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, unsigned char)
     operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
     ^~~~~~~~
/usr/include/c++/6/ostream:519:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<char, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:539:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
     ^~~~~~~~
/usr/include/c++/6/ostream:539:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/ostream:638:0,
                 from /usr/include/c++/6/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/6/bits/ostream.tcc:321:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const char*)
     operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
     ^~~~~~~~
/usr/include/c++/6/bits/ostream.tcc:321:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:556:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char*)
     operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
     ^~~~~~~~
/usr/include/c++/6/ostream:556:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<char, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:569:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const signed char*)
     operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
     ^~~~~~~~
/usr/include/c++/6/ostream:569:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<char, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:574:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const unsigned char*)
     operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
     ^~~~~~~~
/usr/include/c++/6/ostream:574:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<char, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/iostream:39:0,
                 from prog.cpp:1:
/usr/include/c++/6/ostream:628:5: note: candidate: template<class _CharT, class _Traits, class _Tp> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&)
     operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     ^~~~~~~~
/usr/include/c++/6/ostream:628:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:49:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.h:1269:5: note: candidate: template<class _RandomNumberEngine, long unsigned int __w, class _UIntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::independent_bits_engine<_RandomNumberEngine, __w, _UIntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.h:1269:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:477:5: note: candidate: template<class _UIntType1, long unsigned int __w1, long unsigned int __n1, long unsigned int __m1, long unsigned int __r1, _UIntType1 __a1, long unsigned int __u1, _UIntType1 __d1, long unsigned int __s1, _UIntType1 __b1, long unsigned int __t1, _UIntType1 __c1, long unsigned int __l1, _UIntType1 __f1, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::mersenne_twister_engine<_UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:477:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:877:5: note: candidate: template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::uniform_int_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:877:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:936:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::uniform_real_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:936:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2123:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::cauchy_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2123:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:998:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::bernoulli_distribution&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:998:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1898:5: note: candidate: template<class _RealType1, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::normal_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1898:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1080:5: note: candidate: template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::geometric_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1080:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2444:5: note: candidate: template<class _RealType1, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::gamma_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2444:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1731:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::exponential_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1731:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2522:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::weibull_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2522:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2598:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::extreme_value_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2598:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:156:5: note: candidate: template<class _UIntType, _UIntType __a, _UIntType __c, _UIntType __m, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::linear_congruential_engine<_UIntType, __a, __c, __m>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:156:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:632:5: note: candidate: template<class _UIntType, long unsigned int __w, long unsigned int __s, long unsigned int __r, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::subtract_with_carry_engine<_UIntType, __w, __s, __r>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:632:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:702:5: note: candidate: template<class _RandomNumberEngine, long unsigned int __p, long unsigned int __r, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::discard_block_engine<_RandomNumberEngine, __p, __r>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:702:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:831:5: note: candidate: template<class _RandomNumberEngine, long unsigned int __k, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::shuffle_order_engine<_RandomNumberEngine, __k>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:831:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1195:5: note: candidate: template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::negative_binomial_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1195:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1400:5: note: candidate: template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::poisson_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1400:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1667:5: note: candidate: template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::binomial_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1667:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:1963:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::lognormal_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:1963:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2036:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::chi_squared_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2036:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2200:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::fisher_f_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2200:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2275:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::student_t_distribution<_RealType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2275:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2734:5: note: candidate: template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::discrete_distribution<_IntType>&)
     operator<<(std::basic_ostream<_CharT, _Traits>& __os,
     ^~~~~~~~
/usr/include/c++/6/bits/random.tcc:2734:5: note:   template argument deduction/substitution failed:
prog.cpp:20:13: note:   ‘std::mt19937 {aka std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
      gen << " ";
             ^~~
In file included from /usr/include/c++/6/random:51:0,
                 from prog.cpp:5:
/usr/include/c++/6/bits/random.tcc:2944:5: note: candidate: template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const

Standard output is empty