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#include <iostream>
#include <map>
#include <string>
 
using namespace std;
 
int main() {
	map<string, long> myMap;
 
	string key = "value";
	map<string, unsigned int>::iterator it = myMap.find(key);
 
	if(it == myMap.end())
	    myMap.insert(pair<string, unsigned int> (key, 1));
	else
	{
	    int prev_value = it->second;
	    prev_value++;
	    myMap.insert(pair<string, unsigned int> (key, prev_value));
	}
 
	cout << "first: " << crbegin(myMap)->first << " second: " << crbegin(myMap)->second << endl;
}

prog.cpp: In function 'int main()':
prog.cpp:11:53: error: conversion from 'std::map<std::basic_string<char>, long int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, long int> >}' to non-scalar type 'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' requested
  map<string, unsigned int>::iterator it = myMap.find(key);
                                                     ^
prog.cpp:13:8: error: no match for 'operator==' (operand types are 'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' and 'std::map<std::basic_string<char>, long int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, long int> >}')
  if(it == myMap.end())
        ^
In file included from /usr/include/c++/5/map:60:0,
                 from prog.cpp:2:
/usr/include/c++/5/bits/stl_tree.h:233:7: note: candidate: bool std::_Rb_tree_iterator<_Tp>::operator==(const _Self&) const [with _Tp = std::pair<const std::basic_string<char>, unsigned int>; std::_Rb_tree_iterator<_Tp>::_Self = std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >]
       operator==(const _Self& __x) const _GLIBCXX_NOEXCEPT
       ^
/usr/include/c++/5/bits/stl_tree.h:233:7: note:   no known conversion for argument 1 from 'std::map<std::basic_string<char>, long int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, long int> >}' to 'const _Self& {aka const std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >&}'
In file included from /usr/include/c++/5/iosfwd:40:0,
                 from /usr/include/c++/5/ios:38,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/postypes.h:216:5: note: candidate: template<class _StateT> bool std::operator==(const std::fpos<_StateT>&, const std::fpos<_StateT>&)
     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
     ^
/usr/include/c++/5/bits/postypes.h:216:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::fpos<_StateT>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:64:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/stl_pair.h:214:5: note: candidate: template<class _T1, class _T2> constexpr bool std::operator==(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
     ^
/usr/include/c++/5/bits/stl_pair.h:214:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::pair<_T1, _T2>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/stl_iterator.h:292:5: note: candidate: template<class _Iterator> bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
     operator==(const reverse_iterator<_Iterator>& __x,
     ^
/usr/include/c++/5/bits/stl_iterator.h:292:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::reverse_iterator<_Iterator>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/stl_iterator.h:342:5: note: candidate: template<class _IteratorL, class _IteratorR> bool std::operator==(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
     operator==(const reverse_iterator<_IteratorL>& __x,
     ^
/usr/include/c++/5/bits/stl_iterator.h:342:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::reverse_iterator<_Iterator>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/stl_iterator.h:1065:5: note: candidate: template<class _IteratorL, class _IteratorR> bool std::operator==(const std::move_iterator<_Iterator>&, const std::move_iterator<_IteratorR>&)
     operator==(const move_iterator<_IteratorL>& __x,
     ^
/usr/include/c++/5/bits/stl_iterator.h:1065:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::move_iterator<_Iterator>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/stl_iterator.h:1071:5: note: candidate: template<class _Iterator> bool std::operator==(const std::move_iterator<_Iterator>&, const std::move_iterator<_Iterator>&)
     operator==(const move_iterator<_Iterator>& __x,
     ^
/usr/include/c++/5/bits/stl_iterator.h:1071:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::move_iterator<_Iterator>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/string:41:0,
                 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:1:
/usr/include/c++/5/bits/allocator.h:128:5: note: candidate: template<class _T1, class _T2> bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_T2>&)
     operator==(const allocator<_T1>&, const allocator<_T2>&)
     ^
/usr/include/c++/5/bits/allocator.h:128:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::allocator<_CharT>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/string:41:0,
                 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:1:
/usr/include/c++/5/bits/allocator.h:134:5: note: candidate: template<class _Tp> bool std::operator==(const std::allocator<_CharT>&, const std::allocator<_CharT>&)
     operator==(const allocator<_Tp>&, const allocator<_Tp>&)
     ^
/usr/include/c++/5/bits/allocator.h:134:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::allocator<_CharT>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/string:52:0,
                 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:1:
/usr/include/c++/5/bits/basic_string.h:4902:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/usr/include/c++/5/bits/basic_string.h:4902:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/string:52:0,
                 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:1:
/usr/include/c++/5/bits/basic_string.h:4909:5: note: candidate: template<class _CharT> typename __gnu_cxx::__enable_if<std::__is_char<_Tp>::__value, bool>::__type std::operator==(const std::basic_string<_CharT>&, const std::basic_string<_CharT>&)
     operator==(const basic_string<_CharT>& __lhs,
     ^
/usr/include/c++/5/bits/basic_string.h:4909:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::basic_string<_CharT>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/string:52:0,
                 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:1:
/usr/include/c++/5/bits/basic_string.h:4923:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
     operator==(const _CharT* __lhs,
     ^
/usr/include/c++/5/bits/basic_string.h:4923:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   mismatched types 'const _CharT*' and 'std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/string:52:0,
                 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:1:
/usr/include/c++/5/bits/basic_string.h:4935:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> bool std::operator==(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
     operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
     ^
/usr/include/c++/5/bits/basic_string.h:4935:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/bits/ios_base.h:46:0,
                 from /usr/include/c++/5/ios:42,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/system_error:284:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_code&)
   operator==(const error_code& __lhs, const error_code& __rhs) noexcept
   ^
/usr/include/c++/5/system_error:284:3: note:   no known conversion for argument 1 from 'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' to 'const std::error_code&'
/usr/include/c++/5/system_error:289:3: note: candidate: bool std::operator==(const std::error_code&, const std::error_condition&)
   operator==(const error_code& __lhs, const error_condition& __rhs) noexcept
   ^
/usr/include/c++/5/system_error:289:3: note:   no known conversion for argument 1 from 'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' to 'const std::error_code&'
/usr/include/c++/5/system_error:296:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_code&)
   operator==(const error_condition& __lhs, const error_code& __rhs) noexcept
   ^
/usr/include/c++/5/system_error:296:3: note:   no known conversion for argument 1 from 'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' to 'const std::error_condition&'
/usr/include/c++/5/system_error:303:3: note: candidate: bool std::operator==(const std::error_condition&, const std::error_condition&)
   operator==(const error_condition& __lhs,
   ^
/usr/include/c++/5/system_error:303:3: note:   no known conversion for argument 1 from 'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' to 'const std::error_condition&'
In file included from /usr/include/c++/5/bits/locale_facets.h:48:0,
                 from /usr/include/c++/5/bits/basic_ios.h:37,
                 from /usr/include/c++/5/ios:44,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/streambuf_iterator.h:204:5: note: candidate: template<class _CharT, class _Traits> bool std::operator==(const std::istreambuf_iterator<_CharT, _Traits>&, const std::istreambuf_iterator<_CharT, _Traits>&)
     operator==(const istreambuf_iterator<_CharT, _Traits>& __a,
     ^
/usr/include/c++/5/bits/streambuf_iterator.h:204:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::istreambuf_iterator<_CharT, _Traits>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/map:60:0,
                 from prog.cpp:2:
/usr/include/c++/5/bits/stl_tree.h:324:5: note: candidate: template<class _Val> bool std::operator==(const std::_Rb_tree_iterator<_Tp>&, const std::_Rb_tree_const_iterator<_Val>&)
     operator==(const _Rb_tree_iterator<_Val>& __x,
     ^
/usr/include/c++/5/bits/stl_tree.h:324:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, long int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, long int> >}' is not derived from 'const std::_Rb_tree_const_iterator<_Val>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/map:60:0,
                 from prog.cpp:2:
/usr/include/c++/5/bits/stl_tree.h:1273:5: note: candidate: template<class _Key, class _Val, class _KeyOfValue, class _Compare, class _Alloc> bool std::operator==(const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&, const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>&)
     operator==(const _Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/5/bits/stl_tree.h:1273:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/tuple:39:0,
                 from /usr/include/c++/5/bits/stl_map.h:63,
                 from /usr/include/c++/5/map:61,
                 from prog.cpp:2:
/usr/include/c++/5/array:240:5: note: candidate: template<class _Tp, unsigned int _Nm> bool std::operator==(const std::array<_Tp, _Nm>&, const std::array<_Tp, _Nm>&)
     operator==(const array<_Tp, _Nm>& __one, const array<_Tp, _Nm>& __two)
     ^
/usr/include/c++/5/array:240:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::array<_Tp, _Nm>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/bits/stl_map.h:63:0,
                 from /usr/include/c++/5/map:61,
                 from prog.cpp:2:
/usr/include/c++/5/tuple:915:5: note: candidate: template<class ... _TElements, class ... _UElements> constexpr bool std::operator==(const std::tuple<_Args1 ...>&, const std::tuple<_Args2 ...>&)
     operator==(const tuple<_TElements...>& __t,
     ^
/usr/include/c++/5/tuple:915:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::tuple<_Args1 ...>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/map:61:0,
                 from prog.cpp:2:
/usr/include/c++/5/bits/stl_map.h:1073:5: note: candidate: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator==(const std::map<_Key, _Tp, _Compare, _Alloc>&, const std::map<_Key, _Tp, _Compare, _Alloc>&)
     operator==(const map<_Key, _Tp, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/5/bits/stl_map.h:1073:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::map<_Key, _Tp, _Compare, _Alloc>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/map:62:0,
                 from prog.cpp:2:
/usr/include/c++/5/bits/stl_multimap.h:974:5: note: candidate: template<class _Key, class _Tp, class _Compare, class _Alloc> bool std::operator==(const std::multimap<_Key, _Tp, _Compare, _Alloc>&, const std::multimap<_Key, _Tp, _Compare, _Alloc>&)
     operator==(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
     ^
/usr/include/c++/5/bits/stl_multimap.h:974:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const std::multimap<_Key, _Tp, _Compare, _Alloc>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/i386-linux-gnu/c++/5/bits/c++allocator.h:33:0,
                 from /usr/include/c++/5/bits/allocator.h:46,
                 from /usr/include/c++/5/string:41,
                 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:1:
/usr/include/c++/5/ext/new_allocator.h:139:5: note: candidate: template<class _Tp> bool __gnu_cxx::operator==(const __gnu_cxx::new_allocator<_Tp>&, const __gnu_cxx::new_allocator<_Tp>&)
     operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
     ^
/usr/include/c++/5/ext/new_allocator.h:139:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const __gnu_cxx::new_allocator<_Tp>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/stl_iterator.h:827:5: note: candidate: template<class _Iterator, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)
     operator==(const __normal_iterator<_Iterator, _Container>& __lhs,
     ^
/usr/include/c++/5/bits/stl_iterator.h:827:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const __gnu_cxx::__normal_iterator<_Iterator, _Container>'
  if(it == myMap.end())
                     ^
In file included from /usr/include/c++/5/bits/stl_algobase.h:67:0,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/bits/stl_iterator.h:820:5: note: candidate: template<class _IteratorL, class _IteratorR, class _Container> bool __gnu_cxx::operator==(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)
     operator==(const __normal_iterator<_IteratorL, _Container>& __lhs,
     ^
/usr/include/c++/5/bits/stl_iterator.h:820:5: note:   template argument deduction/substitution failed:
prog.cpp:13:21: note:   'std::map<std::basic_string<char>, unsigned int>::iterator {aka std::_Rb_tree_iterator<std::pair<const std::basic_string<char>, unsigned int> >}' is not derived from 'const __gnu_cxx::__normal_iterator<_IteratorL, _Container>'
  if(it == myMap.end())
                     ^

Standard output is empty