Crow：run的流程1 准备阶段

前面已经介绍了Crow如何添加路由，添加插件，以及路由和插件的运行的机制，那么Crow本身是怎么运行起来的呢？

template<typename... Middlewares>
class Crow
{
    ...
    template<typename... Middlewares>
    using App = Crow<Middlewares...>;
    using SimpleApp = Crow<>;
};

Crow类声明了两个别名，App用于带有插件的，SimpleApp用于不带插件的

template<typename... Middlewares>
class Crow
{
    ...
    Crow()
    {}

    /// Construct Crow with a subset of middleware
    template<typename... Ts>
    Crow(Ts&&... ts):
      middlewares_(make_middleware_tuple(std::forward<Ts>(ts)...))
    {}
    
    ...
    std::tuple<Middlewares...> middlewares_;
};

Crow的构造函数，使用模版参数初始化

参考