(This is the legacy documentation for SDL2, the previous stable version; SDL3 is the current stable version.)

SDL_SetAssertionHandler

Set an application-defined assertion handler.

Header File

Syntax

void SDL_SetAssertionHandler(
                    SDL_AssertionHandler handler,
                    void *userdata);

Function Parameters

SDL_AssertionHandler	handler	the SDL_AssertionHandler function to call when an assertion fails or NULL for the default handler.
void *	userdata	a pointer that is passed to `handler`.

Remarks

This function allows an application to show its own assertion UI and/or force the response to an assertion failure. If the application doesn't provide this, SDL will try to do the right thing, popping up a system-specific GUI dialog, and probably minimizing any fullscreen windows.

This callback may fire from any thread, but it runs wrapped in a mutex, so it will only fire from one thread at a time.

This callback is NOT reset to SDL's internal handler upon SDL_Quit()!

Version

This function is available since SDL 2.0.0.