c++ - 类内部的错误处理

Question

假设我在类构造函数中有这段代码:

if(SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
    std::cerr << "Couldn't init SDL2 video" << std::endl;
    std::cerr << SDL_GetError() << std::endl;
}

我如何使用 try、throw、catch 来处理错误而不是 if、cerr？我是否应该使用检查错误的成员函数(返回 bool 值)，然后使用 try、throw、catch 来处理错误？

构造函数:

GLWindow::GLWindow(int width, int height, std::string name) {
    // Init SDL Video
    if(SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
    std::cerr << "Couldn't init SDL2 video" << std::endl;
    std::cerr << SDL_GetError() << std::endl;
    }

    // Forward compatibility
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);

    // Main window
    glWindow = SDL_CreateWindow(name.c_str(), SDL_WINDOWPOS_CENTERED,
        SDL_WINDOWPOS_CENTERED, width, height, SDL_WINDOW_OPENGL);

    // Check if Main window is created
    if(glWindow == NULL) {
        std::cerr << "Couldn't create main window" << std::endl;
        std::cerr << SDL_GetError() << std::endl;
    }

    // GL Context for Main Window
    glContext = SDL_GL_CreateContext(glWindow);

    // Check if GL Context is created
    if(glContext == NULL) {
        std::cerr << "Couldn't create GL context for main window" << std::endl;
        std::cerr << SDL_GetError() << std::endl;
    }
}

Answer 1

我相信你可以做这样的事情:

try {
    if (SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
        throw std::runtime_error("Couldn't init 2D video");
    }
}

catch(const std::runtime_error &e) {
    std::cout << e.what() << std::endl;
    std::cout << SDL_GetError() << std::endl;
}