# SDL_WINDOWPOS_ISUNDEFINED A macro to test if the window position is marked as "undefined." ## Header File Defined in [<SDL3/SDL_video.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_video.h) ## Syntax ```c #define SDL_WINDOWPOS_ISUNDEFINED(X) (((X)&0xFFFF0000) == SDL_WINDOWPOS_UNDEFINED_MASK) ``` ## Macro Parameters | | | | ----- | -------------------------- | | **X** | the window position value. | ## Version This macro is available since SDL 3.2.0. ---- [CategoryAPI](CategoryAPI), [CategoryAPIMacro](CategoryAPIMacro), [CategoryVideo](CategoryVideo)