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moneroexamples 2016-04-06 14:53:37 +08:00
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ext/crow/middleware_context.h Normal file
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#pragma once
#include "utility.h"
#include "http_request.h"
#include "http_response.h"
namespace crow
{
namespace detail
{
template <typename ... Middlewares>
struct partial_context
: public black_magic::pop_back<Middlewares...>::template rebind<partial_context>
, public black_magic::last_element_type<Middlewares...>::type::context
{
using parent_context = typename black_magic::pop_back<Middlewares...>::template rebind<::crow::detail::partial_context>;
template <int N>
using partial = typename std::conditional<N == sizeof...(Middlewares)-1, partial_context, typename parent_context::template partial<N>>::type;
template <typename T>
typename T::context& get()
{
return static_cast<typename T::context&>(*this);
}
};
template <>
struct partial_context<>
{
template <int>
using partial = partial_context;
};
template <int N, typename Context, typename Container, typename CurrentMW, typename ... Middlewares>
bool middleware_call_helper(Container& middlewares, request& req, response& res, Context& ctx);
template <typename ... Middlewares>
struct context : private partial_context<Middlewares...>
//struct context : private Middlewares::context... // simple but less type-safe
{
template <int N, typename Context, typename Container>
friend typename std::enable_if<(N==0)>::type after_handlers_call_helper(Container& middlewares, Context& ctx, request& req, response& res);
template <int N, typename Context, typename Container>
friend typename std::enable_if<(N>0)>::type after_handlers_call_helper(Container& middlewares, Context& ctx, request& req, response& res);
template <int N, typename Context, typename Container, typename CurrentMW, typename ... Middlewares2>
friend bool middleware_call_helper(Container& middlewares, request& req, response& res, Context& ctx);
template <typename T>
typename T::context& get()
{
return static_cast<typename T::context&>(*this);
}
template <int N>
using partial = typename partial_context<Middlewares...>::template partial<N>;
};
}
}