Minimal SDL2 app example

main.cpp

#include <iostream>
#include <exception>
#include <SDL.h>
using namespace std;

class Exception : public exception {
	string msg;
public:
	Exception(string amsg) : msg(amsg) {}
	const char* what() const noexcept {
		return msg.c_str();
	}
};

class App {
	const int DEFAULT_WINDOW_WIDTH = 640;
	const int DEFAULT_WINDOW_HEIGHT = 480;
	SDL_Window *window;
	SDL_Event event;
	bool running = true;
public:
	App();
	~App();
	void init();
	void run();
	void finish();
};

App::App() {}

App::~App() {
	SDL_DestroyWindow(window);	
	SDL_Quit();
}

void App::init() {
	if (SDL_Init(SDL_INIT_VIDEO) < 0) {
		throw Exception(SDL_GetError());
	}
	window = SDL_CreateWindow(
		"Simple Editor", 
		SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
		DEFAULT_WINDOW_WIDTH, DEFAULT_WINDOW_HEIGHT,
		SDL_WINDOW_SHOWN
	);
	if (window == NULL) {
		throw Exception(SDL_GetError());
	}
}

void App::finish() {
	running = false;
}

void App::run() {
	while (running) {
		while (SDL_PollEvent(&event)) {
			if (event.type == SDL_QUIT) {
				finish();
			}
		}
	}
}

int main() {
	App app;
	try {
		app.init();
		app.run();
	} catch(const exception &e) {
		cout << e.what() << endl;
		return 1;
	} catch(...) {
		cout << "Unknow error." << endl;
		return 1;
	}
	return 0;
}