binary function compile error

[dekeenfrance]

Hi,

I wrote a binary function based on existing template:

template <class T> struct percentage : binary_function <T,T,double> {
  double operator() (const T& x, const T& y) const
    {return x*1.0/(x+y);}
};

I call it in form of percentage<int>() When I compile, it's indicated:

error C2143: syntax error : missing ',' before '<'

I use VC 2012.

I am confused. Could anyone please tell me where is the error? Thanks!

[Peter87]

At what line do you get this error on?

[dekeenfrance]

the first line of the template. Do I need a special header to compile it?

[ajh32]

You will need:

#include <algorithm>

using namespace std;

To use the binary_function

[Peter87]

std::binary_function is defined in the <functional> header.

[dekeenfrance]

Thanks for the replies. I added std:: and that works. Just forgot this thing... Thanks! :)