Crow  0.3
A C++ microframework for the web
middleware_context.h
1#pragma once
2
3#include "crow/utility.h"
4#include "crow/http_request.h"
5#include "crow/http_response.h"
6
7namespace crow
8{
9 namespace detail
10 {
11
12
13 template <typename ... Middlewares>
15 : public black_magic::pop_back<Middlewares...>::template rebind<partial_context>
16 , public black_magic::last_element_type<Middlewares...>::type::context
17 {
18 using parent_context = typename black_magic::pop_back<Middlewares...>::template rebind<::crow::detail::partial_context>;
19 template <int N>
20 using partial = typename std::conditional<N == sizeof...(Middlewares)-1, partial_context, typename parent_context::template partial<N>>::type;
21
22 template <typename T>
23 typename T::context& get()
24 {
25 return static_cast<typename T::context&>(*this);
26 }
27 };
28
29
30
31 template <>
33 {
34 template <int>
36 };
37
38
39
40 template <int N, typename Context, typename Container, typename CurrentMW, typename ... Middlewares>
41 bool middleware_call_helper(Container& middlewares, request& req, response& res, Context& ctx);
42
43
44
45 template <typename ... Middlewares>
46 struct context : private partial_context<Middlewares...>
47 //struct context : private Middlewares::context... // simple but less type-safe
48 {
49 template <int N, typename Context, typename Container>
50 friend typename std::enable_if<(N==0)>::type after_handlers_call_helper(Container& middlewares, Context& ctx, request& req, response& res);
51 template <int N, typename Context, typename Container>
52 friend typename std::enable_if<(N>0)>::type after_handlers_call_helper(Container& middlewares, Context& ctx, request& req, response& res);
53
54 template <int N, typename Context, typename Container, typename CurrentMW, typename ... Middlewares2>
55 friend bool middleware_call_helper(Container& middlewares, request& req, response& res, Context& ctx);
56
57 template <typename T>
58 typename T::context& get()
59 {
60 return static_cast<typename T::context&>(*this);
61 }
62
63 template <int N>
64 using partial = typename partial_context<Middlewares...>::template partial<N>;
65 };
66 }
67}
Definition: utility.h:320
Definition: utility.h:366
Definition: middleware_context.h:48
Definition: middleware_context.h:17
An HTTP request.
Definition: http_request.h:27
HTTP response.
Definition: http_response.h:24