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#include <iostream>
#include <vector>
#include <random>
 
// Set population size
 
const int population_size = 10;
const int number_of_variables = 4;
 
 
class cChromo
{
 
	public:
	 std::vector<int> myVariables(number_of_variables );
 
	 void Rand()
	 {
	 	std::random_device rd;    
std::mt19937 rng(rd());    // random-number engine (Mersenne-Twister in this case)
std::uniform_int_distribution<int> uni(-10, 10); 
	 	for (int i = 0; i < number_of_variables; ++i)
{
    myVariables.push_back(  uni(rng) );
}
	 }
	 void Show()
	 {
	 	std::cout << "Chromo: ";
	 	for( auto v : myVariables )
	 		std::cout << " ";
	 	std::cout << "\n";
	 }
 
};
 
int main()
{
// Generate random number
 
std::random_device rd;    
std::mt19937 rng(rd());    // random-number engine (Mersenne-Twister in this case)
std::uniform_int_distribution<int> uni(-10, 10); 
 
// Set gene values.
 
std::vector< std::vector<int>>chromosome;
 
 
for( int kp = 0; kp < population_size; kp++ )
{
	std::vector<int>variables;
for (int i = 0; i < number_of_variables; ++i)
{
    double rand_num = uni(rng);
    variables.push_back (rand_num);
 
}
chromosome.push_back( variables );
}
 
for( auto c : chromosome )
{
	for( auto v : c )
	{
		std::cout << v << " ";
	}
	std::cout << "\n";
}
 
 
 
std::cout << "OOD\n";
 
std::vector< cChromo > Population( population_size );
 
for( auto c : Population )
{
	c.Rand();
}
 
for( auto c : Population )
{
	c.Show();
}
 
 
return 0;
}

prog.cpp:16:32: error: 'number_of_variables' is not a type
   std::vector<int> myVariables(number_of_variables );
                                ^
prog.cpp: In member function 'void cChromo::Rand()':
prog.cpp:25:5: error: '((cChromo*)this)->cChromo::myVariables' does not have class type
     myVariables.push_back(  uni(rng) );
     ^
prog.cpp: In member function 'void cChromo::Show()':
prog.cpp:31:18: error: invalid initialization of reference of type 'std::vector<int> (cChromo::*&&)(int)' from expression of type '<unresolved overloaded function type>'
    for( auto v : myVariables )
                  ^
prog.cpp:31:18: error: no matching function for call to 'begin(std::vector<int> (cChromo::*&)(int))'
In file included from /usr/include/c++/5/string:51:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:2:
/usr/include/c++/5/bits/range_access.h:87:5: note: candidate: template<class _Tp, unsigned int _Nm> constexpr _Tp* std::begin(_Tp (&)[_Nm])
     begin(_Tp (&__arr)[_Nm])
     ^
/usr/include/c++/5/bits/range_access.h:87:5: note:   template argument deduction/substitution failed:
prog.cpp:31:18: note:   mismatched types '_Tp [_Nm]' and 'std::vector<int> (cChromo::*)(int)'
    for( auto v : myVariables )
                  ^
In file included from /usr/include/c++/5/string:51:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:2:
/usr/include/c++/5/bits/range_access.h:58:5: note: candidate: template<class _Container> decltype (__cont.begin()) std::begin(const _Container&)
     begin(const _Container& __cont) -> decltype(__cont.begin())
     ^
/usr/include/c++/5/bits/range_access.h:58:5: note:   template argument deduction/substitution failed:
/usr/include/c++/5/bits/range_access.h: In substitution of 'template<class _Container> decltype (__cont.begin()) std::begin(const _Container&) [with _Container = std::vector<int> (cChromo::*)(int)]':
prog.cpp:31:18:   required from here
/usr/include/c++/5/bits/range_access.h:58:5: error: request for member 'begin' in '__cont', which is of non-class type 'std::vector<int> (cChromo::* const)(int)'
/usr/include/c++/5/bits/range_access.h:48:5: note: candidate: template<class _Container> decltype (__cont.begin()) std::begin(_Container&)
     begin(_Container& __cont) -> decltype(__cont.begin())
     ^
/usr/include/c++/5/bits/range_access.h:48:5: note:   template argument deduction/substitution failed:
/usr/include/c++/5/bits/range_access.h: In substitution of 'template<class _Container> decltype (__cont.begin()) std::begin(_Container&) [with _Container = std::vector<int> (cChromo::*)(int)]':
prog.cpp:31:18:   required from here
/usr/include/c++/5/bits/range_access.h:48:5: error: request for member 'begin' in '__cont', which is of non-class type 'std::vector<int> (cChromo::*)(int)'
In file included from /usr/include/c++/5/bits/range_access.h:36:0,
                 from /usr/include/c++/5/string:51,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:2:
/usr/include/c++/5/initializer_list:89:5: note: candidate: template<class _Tp> constexpr const _Tp* std::begin(std::initializer_list<_Tp>)
     begin(initializer_list<_Tp> __ils) noexcept
     ^
/usr/include/c++/5/initializer_list:89:5: note:   template argument deduction/substitution failed:
prog.cpp:31:18: note:   mismatched types 'std::initializer_list<_Tp>' and 'std::vector<int> (cChromo::*)(int)'
    for( auto v : myVariables )
                  ^
prog.cpp:31:18: error: no matching function for call to 'end(std::vector<int> (cChromo::*&)(int))'
In file included from /usr/include/c++/5/string:51:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:2:
/usr/include/c++/5/bits/range_access.h:97:5: note: candidate: template<class _Tp, unsigned int _Nm> constexpr _Tp* std::end(_Tp (&)[_Nm])
     end(_Tp (&__arr)[_Nm])
     ^
/usr/include/c++/5/bits/range_access.h:97:5: note:   template argument deduction/substitution failed:
prog.cpp:31:18: note:   mismatched types '_Tp [_Nm]' and 'std::vector<int> (cChromo::*)(int)'
    for( auto v : myVariables )
                  ^
In file included from /usr/include/c++/5/string:51:0,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:2:
/usr/include/c++/5/bits/range_access.h:78:5: note: candidate: template<class _Container> decltype (__cont.end()) std::end(const _Container&)
     end(const _Container& __cont) -> decltype(__cont.end())
     ^
/usr/include/c++/5/bits/range_access.h:78:5: note:   template argument deduction/substitution failed:
/usr/include/c++/5/bits/range_access.h: In substitution of 'template<class _Container> decltype (__cont.end()) std::end(const _Container&) [with _Container = std::vector<int> (cChromo::*)(int)]':
prog.cpp:31:18:   required from here
/usr/include/c++/5/bits/range_access.h:78:5: error: request for member 'end' in '__cont', which is of non-class type 'std::vector<int> (cChromo::* const)(int)'
/usr/include/c++/5/bits/range_access.h:68:5: note: candidate: template<class _Container> decltype (__cont.end()) std::end(_Container&)
     end(_Container& __cont) -> decltype(__cont.end())
     ^
/usr/include/c++/5/bits/range_access.h:68:5: note:   template argument deduction/substitution failed:
/usr/include/c++/5/bits/range_access.h: In substitution of 'template<class _Container> decltype (__cont.end()) std::end(_Container&) [with _Container = std::vector<int> (cChromo::*)(int)]':
prog.cpp:31:18:   required from here
/usr/include/c++/5/bits/range_access.h:68:5: error: request for member 'end' in '__cont', which is of non-class type 'std::vector<int> (cChromo::*)(int)'
In file included from /usr/include/c++/5/bits/range_access.h:36:0,
                 from /usr/include/c++/5/string:51,
                 from /usr/include/c++/5/bits/locale_classes.h:40,
                 from /usr/include/c++/5/bits/ios_base.h:41,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:2:
/usr/include/c++/5/initializer_list:99:5: note: candidate: template<class _Tp> constexpr const _Tp* std::end(std::initializer_list<_Tp>)
     end(initializer_list<_Tp> __ils) noexcept
     ^
/usr/include/c++/5/initializer_list:99:5: note:   template argument deduction/substitution failed:
prog.cpp:31:18: note:   mismatched types 'std::initializer_list<_Tp>' and 'std::vector<int> (cChromo::*)(int)'
    for( auto v : myVariables )
                  ^

Standard output is empty