C++中异常内部的异常

try {
    // 抛出异常
    throw std::runtime_error("Error 1");
} catch (const std::exception& e) {
    try {
        // 再次抛出异常
        throw std::runtime_error("Error 2");
    } catch (const std::exception& e) {
        // 处理异常
        std::cerr << "Caught exception: " << e.what()<< std::endl;
    }
}

try {
    // 抛出异常
    throw std::runtime_error("Error 1");
} catch (const std::exception& e) {
    try {
        // 再次抛出异常
        throw std::runtime_error("Error 2");
    } catch (const std::exception& e) {
        // 处理异常
        std::cerr << "Caught exception: " << e.what()<< std::endl;
        // 重新抛出原来的异常
        throw;
    }
}