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View Compilation Error

0_0_19739621_12256.cpp: In function 'int main()':
0_0_19739621_12256.cpp:45:8: error: reference to 'is_empty' is ambiguous
     if(is_empty()) printf("Invalid.\n");
        ^
0_0_19739621_12256.cpp:10:6: note: candidates are: bool is_empty()
 bool is_empty(){
      ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/move.h:57:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algobase.h:64,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/char_traits.h:39,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ios:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/istream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/sstream:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/complex:45,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/ccomplex:38,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:52,
                 from 0_0_19739621_12256.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:632:12: note:                 template<class _Tp> struct std::is_empty
     struct is_empty
            ^


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