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#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
 
class foo
{
    int a;
    public:
    foo(int _a):a(_a){}
};
 
int main() {
    foo f1(5),f2(10);
    vector<foo> vec = {f1,f2};
    f1==f2;
    //vec.erase(remove(vec.begin(),vec.end(),f1),vec.end()); // remove f1 (error)
    return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:16:7: error: no match for 'operator==' (operand types are 'foo' and 'foo')
     f1==f2;
       ^
In file included from /usr/include/c++/5/random:51:0,
                 from /usr/include/c++/5/bits/stl_algo.h:66,
                 from /usr/include/c++/5/algorithm:62,
                 from prog.cpp:3:
/usr/include/c++/5/bits/random.tcc:2030:5: note: candidate: template<class _RealType1> bool std::operator==(const std::normal_distribution<_RealType>&, const std::normal_distribution<_RealType>&)
     operator==(const std::normal_distribution<_RealType>& __d1,
     ^
/usr/include/c++/5/bits/random.tcc:2030:5: note:   template argument deduction/substitution failed:
prog.cpp:16:9: note:   'foo' is not derived from 'const std::normal_distribution<_RealType>'
     f1==f2;
         ^
In file included from /usr/include/c++/5/vector:64:0,
                 from prog.cpp:2:
/usr/include/c++/5/bits/stl_vector.h:1511:5: note: candidate: template<class _Tp, class _Alloc> bool std::operator==(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)
     operator==(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
     ^
/usr/include/c++/5/bits/stl_vector.h:1511:5: note:   template argument deduction/substitution failed:
prog.cpp:16:9: note:   'foo' is not derived from 'const std::vector<_Tp, _Alloc>'
     f1==f2;
         ^
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:16:9: note:   'foo' is not derived from 'const std::istreambuf_iterator<_CharT, _Traits>'
     f1==f2;
         ^
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: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 'foo' to 'const std::error_condition&'
/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 'foo' to 'const std::error_condition&'
/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 'foo' to 'const std::error_code&'
/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 'foo' to 'const std::error_code&'
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:16:9: note:   'foo' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
     f1==f2;
         ^
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:16:9: note:   mismatched types 'const _CharT*' and 'foo'
     f1==f2;
         ^
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:16:9: note:   'foo' is not derived from 'const std::basic_string<_CharT>'
     f1==f2;
         ^
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:16:9: note:   'foo' is not derived from 'const std::basic_string<_CharT, _Traits, _Alloc>'
     f1==f2;
         ^
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:16:9: note:   'foo' is not derived from 'const std::allocator<_CharT>'
     f1==f2;
         ^
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:16:9: note:   'foo' is not derived from 'const std::allocator<_CharT>'
     f1==f2;
         ^
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:16:9: note:   'foo' is not derived from 'const std::move_iterator<_Iterator>'
     f1==f2;
         ^
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:16:9: note:   'foo' is not derived from 'const std::move_iterator<_Iterator>'
     f1==f2;
         ^
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:16:9: note:   'foo' is not derived from 'const std::reverse_iterator<_Iterator>'
     f1==f2;
         ^
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:16:9: note:   'foo' is not derived from 'const std::reverse_iterator<_Iterator>'
     f1==f2;
         ^
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:16:9: note:   'foo' is not derived from 'const std::pair<_T1, _T2>'
     f1==f2;
         ^
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:16:9: note:   'foo' is not derived from 'const std::fpos<_StateT>'
     f1==f2;
         ^

Standard output is empty