View Compilation Error

0_0_4164470_751.cpp: In function `int main()':
0_0_4164470_751.cpp:14: error: no match for 'operator==' in '(&str)->std::basic_string<_CharT, _Traits, _Alloc>::begin [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]() == "5"'
0_0_4164470_751.cpp:20: error: no match for 'operator==' in '(&str)->std::basic_string<_CharT, _Traits, _Alloc>::end [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]() == "5"'