View Compilation Error

0_0_19677100_17438.cpp: In function 'int main()':
0_0_19677100_17438.cpp:62:17: error: cannot bind 'std::ostream {aka std::basic_ostream<char>}' lvalue to 'std::basic_ostream<char>&&'
     cout << a + b << endl;
                 ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/iostream:39:0,
                 from 0_0_19677100_17438.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/ostream:602:5: note: initializing argument 1 of 'std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Tp = bigint]'
     operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
     ^