diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/http_connection.h | 96 |
1 files changed, 84 insertions, 12 deletions
diff --git a/include/http_connection.h b/include/http_connection.h index 212f1cd..d9ccb21 100644 --- a/include/http_connection.h +++ b/include/http_connection.h @@ -21,32 +21,104 @@ namespace crow { namespace detail { + template <typename MW> + struct check_before_handle_arity_3_const + { + template <typename T, + void (T::*)(request&, response&, typename MW::context&) const = &T::before_handle + > + struct get + { }; + }; + + template <typename MW> + struct check_before_handle_arity_3 + { + template <typename T, + void (T::*)(request&, response&, typename MW::context&) = &T::before_handle + > + struct get + { }; + }; + + template <typename MW> + struct check_after_handle_arity_3_const + { + template <typename T, + void (T::*)(request&, response&, typename MW::context&) const = &T::after_handle + > + struct get + { }; + }; + + template <typename MW> + struct check_after_handle_arity_3 + { + template <typename T, + void (T::*)(request&, response&, typename MW::context&) = &T::after_handle + > + struct get + { }; + }; + + template <typename T> + struct is_before_handle_arity_3_impl + { + template <typename C> + static std::true_type f(typename check_before_handle_arity_3_const<T>::template get<C>*); + + template <typename C> + static std::true_type f(typename check_before_handle_arity_3<T>::template get<C>*); + + template <typename C> + static std::false_type f(...); + + public: + static const bool value = decltype(f<T>(nullptr))::value; + }; + + template <typename T> + struct is_after_handle_arity_3_impl + { + template <typename C> + static std::true_type f(typename check_after_handle_arity_3_const<T>::template get<C>*); + + template <typename C> + static std::true_type f(typename check_after_handle_arity_3<T>::template get<C>*); + + template <typename C> + static std::false_type f(...); + + public: + static const bool value = decltype(f<T>(nullptr))::value; + }; + template <typename MW, typename Context, typename ParentContext> - void before_handler_call(MW& mw, request& req, response& res, Context& ctx, ParentContext& parent_ctx, - decltype(std::declval<MW>().before_handle(std::declval<request&>(), std::declval<response&>(), std::declval<typename MW::context&>()))* dummy = 0) + typename std::enable_if<!is_before_handle_arity_3_impl<MW>::value>::type + before_handler_call(MW& mw, request& req, response& res, Context& ctx, ParentContext& parent_ctx) { - mw.before_handle(req, res, ctx.template get<MW>()); + mw.before_handle(req, res, ctx.template get<MW>(), ctx); } template <typename MW, typename Context, typename ParentContext> - void before_handler_call(MW& mw, request& req, response& res, Context& ctx, ParentContext& parent_ctx, - decltype(std::declval<MW>().before_handle(std::declval<request&>(), std::declval<response&>(), std::declval<typename MW::context&>(), std::declval<Context&>))* dummy = 0) + typename std::enable_if<is_before_handle_arity_3_impl<MW>::value>::type + before_handler_call(MW& mw, request& req, response& res, Context& ctx, ParentContext& parent_ctx) { - mw.before_handle(req, res, ctx.template get<MW>(), parent_ctx); + mw.before_handle(req, res, ctx.template get<MW>()); } template <typename MW, typename Context, typename ParentContext> - void after_handler_call(MW& mw, request& req, response& res, Context& ctx, ParentContext& parent_ctx, - decltype(std::declval<MW>().before_handle(std::declval<request&>(), std::declval<response&>(), std::declval<typename MW::context&>()))* dummy = 0) + typename std::enable_if<!is_after_handle_arity_3_impl<MW>::value>::type + after_handler_call(MW& mw, request& req, response& res, Context& ctx, ParentContext& parent_ctx) { - mw.after_handle(req, res, ctx.template get<MW>()); + mw.after_handle(req, res, ctx.template get<MW>(), ctx); } template <typename MW, typename Context, typename ParentContext> - void after_handler_call(MW& mw, request& req, response& res, Context& ctx, ParentContext& parent_ctx, - decltype(std::declval<MW>().before_handle(std::declval<request&>(), std::declval<response&>(), std::declval<typename MW::context&>(), std::declval<Context&>))* dummy = 0) + typename std::enable_if<is_after_handle_arity_3_impl<MW>::value>::type + after_handler_call(MW& mw, request& req, response& res, Context& ctx, ParentContext& parent_ctx) { - mw.after_handle(req, res, ctx.template get<MW>(), parent_ctx); + mw.after_handle(req, res, ctx.template get<MW>()); } template <int N, typename Context, typename Container, typename CurrentMW, typename ... Middlewares> |