View Compilation Error

0_0_29469238_18214.cpp: In function 'int run()':
0_0_29469238_18214.cpp:48:20: error: reference to 'hash' is ambiguous
             x[i] = hash(str);
                    ^
0_0_29469238_18214.cpp:28:5: note: candidates are: int hash(std::string)
 int hash(string str)
     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/basic_string.h:3068:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/string:52,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/random:40,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62,
                 from 0_0_29469238_18214.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/functional_hash.h:58:12: note:                 template<class _Tp> struct std::hash
     struct hash;
            ^