Man page - sdl_windowpos_isundefined(3)

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Manual

SDL_WINDOWPOS_ISUNDEFINED(3) SDL3 FUNCTIONS SDL_WINDOWPOS_ISUNDEFINED(3)

SDL_WINDOWPOS_ISUNDEFINED - A macro to test if the window position is marked as "undefined."

Defined in SDL3/SDL_video.h

#include "SDL3/SDL.h"
#define SDL_WINDOWPOS_ISUNDEFINED(X)    (((X)&0xFFFF0000) == SDL_WINDOWPOS_UNDEFINED_MASK)

This macro is available since SDL 3.2.0.

SDL 3.2.10 Simple Directmedia Layer