SDL_IN_BYTECAP - Man Page

Defined in SDL3/SDL_stdinc.h

#include "SDL3/SDL.h"

#define SDL_IN_BYTECAP(x) _In_bytecount_(x)

If we were to annotate memcpy :

void *memcpy(void *dst, SDL_IN_BYTECAP(len) const void *src, size_t len);

This notes that src should be len bytes in size and is only read by the function. The compiler or other analysis tools can warn when this doesn't appear to be the case.

On compilers without this annotation mechanism, this is defined to nothing.

This macro is available since SDL 3.2.0.