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#pragma once
#include "http_request.h"
#include "http_response.h"
#include "utility.h"
namespace crow
{
namespace detail
{
template <typename... Middlewares>
struct PartialContext
: public black_magic::PopBack<Middlewares...>::template rebind<
PartialContext>,
public black_magic::LastElementType<Middlewares...>::type::Context
{
using parent_context = typename black_magic::PopBack<
Middlewares...>::template rebind<::crow::detail::PartialContext>;
template <size_t N>
using partial = typename std::conditional<
N == sizeof...(Middlewares) - 1, PartialContext,
typename parent_context::template partial<N>>::type;
template <typename T> typename T::Context& get()
{
return static_cast<typename T::Context&>(*this);
}
};
template <> struct PartialContext<>
{
template <size_t> using partial = PartialContext;
};
template <size_t N, typename Context, typename Container, typename CurrentMW,
typename... Middlewares>
bool middlewareCallHelper(Container& middlewares, Request& req, Response& res,
Context& ctx);
template <typename... Middlewares>
struct Context : private PartialContext<Middlewares...>
// struct Context : private Middlewares::context... // simple but less type-safe
{
template <size_t N, typename Context, typename Container>
friend typename std::enable_if<(N == 0)>::type
afterHandlersCallHelper(Container& middlewares, Context& ctx,
Request& req, Response& res);
template <size_t N, typename Context, typename Container>
friend typename std::enable_if<(N > 0)>::type
afterHandlersCallHelper(Container& middlewares, Context& ctx,
Request& req, Response& res);
template <size_t N, typename Context, typename Container,
typename CurrentMW, typename... Middlewares2>
friend bool middlewareCallHelper(Container& middlewares, Request& req,
Response& res, Context& ctx);
template <typename T> typename T::Context& get()
{
return static_cast<typename T::Context&>(*this);
}
template <size_t N>
using partial =
typename PartialContext<Middlewares...>::template partial<N>;
};
} // namespace detail
} // namespace crow
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