无轮询的SDL2事件回调

EventWatch Filter 不轮询新事件?

#include <SDL2/SDL.h>
#include <iostream>

 int SDLCALL watch(void *userdata, SDL_Event* event) {
        std::cout << event->type << "\n";
    return 1; // or 0
}

int main( ){
    SDL_Window *window {SDL_CreateWindow("Window", 100, 100, 400, 400, 0)};
    SDL_Renderer* renderer {SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED)};

    SDL_SetEventFilter(watch, NULL);

    function.Call("main"); // non-C++ function with endless loop

    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 0;
}

这已经是一个无止境的循环 "main" watch(..)