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#include <map>
#include <stdio.h>
 
int main() {
    std::map<int,int> x = {{1,2},{3,4}};
    printf("%d", x.end() - x.begin())
    return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:6:36: error: no match for ‘operator-’ in ‘x.std::map<_Key, _Tp, _Compare, _Alloc>::end<int, int, std::less<int>, std::allocator<std::pair<const int, int> > >() - x.std::map<_Key, _Tp, _Compare, _Alloc>::begin<int, int, std::less<int>, std::allocator<std::pair<const int, int> > >()’
prog.cpp:6:36: note: candidates are:
In file included from /usr/include/c++/4.7/bits/stl_algobase.h:68:0,
                 from /usr/include/c++/4.7/bits/stl_tree.h:63,
                 from /usr/include/c++/4.7/map:60,
                 from prog.cpp:1:
/usr/include/c++/4.7/bits/stl_iterator.h:1113:5: note: template<class _Iterator> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_Iterator>&, const std::move_iterator<_Iterator>&)
/usr/include/c++/4.7/bits/stl_iterator.h:1113:5: note:   template argument deduction/substitution failed:
prog.cpp:6:36: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::move_iterator<_Iterator>’
In file included from /usr/include/c++/4.7/bits/stl_algobase.h:68:0,
                 from /usr/include/c++/4.7/bits/stl_tree.h:63,
                 from /usr/include/c++/4.7/map:60,
                 from prog.cpp:1:
/usr/include/c++/4.7/bits/stl_iterator.h:1106:5: note: template<class _IteratorL, class _IteratorR> decltype ((__x.base() - __y.base())) std::operator-(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)
/usr/include/c++/4.7/bits/stl_iterator.h:1106:5: note:   template argument deduction/substitution failed:
prog.cpp:6:36: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::move_iterator<_IteratorL>’
In file included from /usr/include/c++/4.7/bits/stl_algobase.h:68:0,
                 from /usr/include/c++/4.7/bits/stl_tree.h:63,
                 from /usr/include/c++/4.7/map:60,
                 from prog.cpp:1:
/usr/include/c++/4.7/bits/stl_iterator.h:381:5: note: template<class _IteratorL, class _IteratorR> decltype ((__y.base() - __x.base())) std::operator-(const std::reverse_iterator<_IteratorL>&, const std::reverse_iterator<_IteratorR>&)
/usr/include/c++/4.7/bits/stl_iterator.h:381:5: note:   template argument deduction/substitution failed:
prog.cpp:6:36: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::reverse_iterator<_IteratorL>’
In file included from /usr/include/c++/4.7/bits/stl_algobase.h:68:0,
                 from /usr/include/c++/4.7/bits/stl_tree.h:63,
                 from /usr/include/c++/4.7/map:60,
                 from prog.cpp:1:
/usr/include/c++/4.7/bits/stl_iterator.h:329:5: note: template<class _Iterator> typename std::reverse_iterator::difference_type std::operator-(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
/usr/include/c++/4.7/bits/stl_iterator.h:329:5: note:   template argument deduction/substitution failed:
prog.cpp:6:36: note:   ‘std::map<int, int>::iterator {aka std::_Rb_tree_iterator<std::pair<const int, int> >}’ is not derived from ‘const std::reverse_iterator<_Iterator>’
prog.cpp:7:5: error: expected ‘;’ before ‘return’

Standard output is empty