Error 2146 in visual studio 2012 c++

Question

I was using an older version of visual studio before and now I switched to visual studio 2012 and I'm getting an error in my code. It says:

error C2146: syntax error : missing ')' before identifier 'r'

How can I fix it...I've been looking for a solution for a very long time. The error is in the first line of the code...

template <class T1, class T2> inline void va_copy(T1& r, const T2& v) 
{
    r[0] = v[0];
    r[1] = v[1];
    r[2] = v[2];
}

Answer 1

va_copy is a macro defined in stdarg.h and that's the reason why you're getting that error. You can prevent the preprocessor from expanding the macro by adding a pair of parenthesis () to the function name

#include <iostream>
#include <stdarg.h>

template <class T1, class T2> inline void (va_copy)(T1& r, const T2& v)
{
    r[0] = v[0];
    r[1] = v[1];
    r[2] = v[2];
}

int main() {
    int a[] = { 32, 33, 34 };
    const int b[] = { 22, 23, 24 };
    (va_copy)(a, b);
}