How to disable a warning within a C++ macro

Question

In Visual C++ you can temporarily disable a warning by using pragma:

#pragma warning(suppress: 4307)

How can I disable a warning within a macro, e.g., when I cause an "integral constant overflow" warning like this:

#define TIMES_A_MILLION(x) x * 1000000
int value = TIMES_A_MILLION(4711);

I don't want to repeat the warning at every place where the macro is used, but want the suppression to be part of the macro it self.

It is obviously not possible to do like this:

#define TIMES_A_MILLION(x) \
#pragma warning(suppress: 4307) \
  x * 1000000

Answer 1

In your case you have to use the extension __pragma

__pragma

instead of

#pragma