View Compilation Error

0_0_24835806_28614.cpp: In function 'int main()':
0_0_24835806_28614.cpp:45:21: error: reference to 'function' is ambiguous
   struct node wxd = function(n);
                     ^
0_0_24835806_28614.cpp:12:13: note: candidates are: node function(int)
 struct node 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_24835806_28614.cpp:1:
GCC4.9.2/x86_64-w64-mingw32/include/c++/functional:1834:11: note:                 template<class _Signature> class std::function
     class function;
           ^