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View Compilation Error

0_0_16848384_24478.cpp: In function 'int main()':
0_0_16848384_24478.cpp:12:16: error: no matching function for call to 'std::basic_istream<char>::getline(std::string&)'
 cin.getline(str);
                ^
0_0_16848384_24478.cpp:12:16: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:40:0,
                 from 0_0_16848384_24478.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:618:5: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::getline(std::basic_istream<_CharT, _Traits>::char_type*, std::streamsize, std::basic_istream<_CharT, _Traits>::char_type) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::char_type = char; std::streamsize = long long int]
     basic_istream<char>::
     ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:618:5: note:   candidate expects 3 arguments, 1 provided
GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:427:7: note: std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::getline(std::basic_istream<_CharT, _Traits>::char_type*, std::streamsize) [with _CharT = char; _Traits = std::char_traits<char>; std::basic_istream<_CharT, _Traits>::__istream_type = std::basic_istream<char>; std::basic_istream<_CharT, _Traits>::char_type = char; std::streamsize = long long int]
       getline(char_type* __s, streamsize __n)
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:427:7: note:   candidate expects 2 arguments, 1 provided


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