View Compilation Error

0_0_30573104_13959.cpp: In function 'long long int doit()':
0_0_30573104_13959.cpp:43:21: error: reference to 'function' is ambiguous
             if(n>1) function(n);
                     ^
0_0_30573104_13959.cpp:26:6: note: candidates are: void function(int)
 void function(int n)
      ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/x86_64-w64-mingw32/bits/stdc++.h:70:0,
                 from 0_0_30573104_13959.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/functional:1834:11: note:                 template<class _Signature> class std::function
     class function;
           ^