Man page - sdl_mouse_touchid(3)

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Manual

SDL_MOUSE_TOUCHID(3) SDL3 FUNCTIONS SDL_MOUSE_TOUCHID(3)

SDL_MOUSE_TOUCHID - The SDL_TouchID
for touch events simulated with mouse input.

Defined in SDL3/SDL_touch.h

#include "SDL3/SDL.h"
#define SDL_MOUSE_TOUCHID ((SDL_TouchID)-1)

This macro is available since SDL 3.2.0.

SDL 3.2.10 Simple Directmedia Layer