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