| 1 | // Copyright (C) 2020 Mikhail Svetkin <mikhail.svetkin@gmail.com> |
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| 2 | // Copyright (C) 2019 The Qt Company Ltd. |
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| 3 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only |
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| 4 | |
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| 5 | #ifndef QHTTPSERVERVIEWTRAITS_H |
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| 6 | #define QHTTPSERVERVIEWTRAITS_H |
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| 7 | |
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| 8 | #include <QtHttpServer/qhttpserverviewtraits_impl.h> |
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| 9 | |
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| 10 | QT_BEGIN_NAMESPACE |
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| 11 | |
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| 12 | class QHttpServerRequest; |
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| 13 | class QHttpServerResponse; |
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| 14 | |
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| 15 | namespace QtPrivate { |
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| 16 | |
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| 17 | template <typename ViewHandler, bool DisableStaticAssert> |
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| 18 | struct AfterRequestViewTraitsHelper : ViewTraits<ViewHandler, DisableStaticAssert> { |
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| 19 | using VTraits = ViewTraits<ViewHandler, DisableStaticAssert>; |
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| 20 | using FunctionTraits = typename VTraits::FTraits; |
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| 21 | |
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| 22 | static_assert(DisableStaticAssert || |
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| 23 | FunctionTraits::ArgumentCount == 2 || |
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| 24 | FunctionTraits::ArgumentCount == 1, |
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| 25 | "ViewHandler arguments error: " |
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| 26 | "afterRequest can only accept QHttpServerResponse and QHttpServerRequest" ); |
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| 27 | |
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| 28 | static_assert(DisableStaticAssert || |
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| 29 | std::is_same<typename FunctionTraits::ReturnType, |
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| 30 | QHttpServerResponse>::value, |
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| 31 | "ViewHandler return type error: " |
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| 32 | "Return type can only be QHttpServerResponse" ); |
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| 33 | |
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| 34 | template<int I> |
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| 35 | struct ArgumentChecker { |
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| 36 | using IsRequest = typename VTraits::template Special<I, const QHttpServerRequest &>; |
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| 37 | static_assert(IsRequest::AssertCondition, |
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| 38 | "ViewHandler arguments error: " |
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| 39 | "QHttpServerRequest can only be passed as a const reference" ); |
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| 40 | |
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| 41 | using IsResponse = typename VTraits::template Special<I, QHttpServerResponse &&>; |
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| 42 | static_assert(IsResponse::AssertCondition, |
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| 43 | "ViewHandler arguments error: " |
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| 44 | "QHttpServerResponse can only be passed as an rvalue reference" ); |
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| 45 | |
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| 46 | using IsSpecial = CheckAny<IsRequest, IsResponse>; |
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| 47 | |
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| 48 | static constexpr bool Valid = IsSpecial::Valid; |
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| 49 | static constexpr bool StaticAssert = IsSpecial::StaticAssert; |
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| 50 | }; |
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| 51 | |
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| 52 | struct Arguments { |
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| 53 | template<int ... I> |
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| 54 | struct ArgumentsReturn { |
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| 55 | template<int Idx> |
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| 56 | using Arg = ArgumentChecker<Idx>; |
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| 57 | static constexpr bool Valid = (Arg<I>::Valid && ...); |
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| 58 | static constexpr bool StaticAssert = (Arg<I>::StaticAssert && ...); |
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| 59 | using Last = Arg<FunctionTraits::ArgumentIndexMax>; |
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| 60 | static constexpr std::size_t Count = FunctionTraits::ArgumentCount; |
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| 61 | }; |
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| 62 | |
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| 63 | template<int ... I> |
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| 64 | static constexpr ArgumentsReturn<I...> eval(QtPrivate::IndexesList<I...>) noexcept |
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| 65 | { |
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| 66 | return ArgumentsReturn<I...>{}; |
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| 67 | } |
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| 68 | }; |
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| 69 | }; |
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| 70 | |
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| 71 | } // namespace QtPrivate |
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| 72 | |
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| 73 | template <typename ViewHandler, bool DisableStaticAssert = false> |
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| 74 | struct QHttpServerAfterRequestViewTraits |
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| 75 | { |
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| 76 | using Helpers = typename QtPrivate::AfterRequestViewTraitsHelper<ViewHandler, DisableStaticAssert>; |
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| 77 | using Arguments = decltype(Helpers::Arguments::eval(typename Helpers::ArgumentIndexes{})); |
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| 78 | }; |
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| 79 | |
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| 80 | QT_END_NAMESPACE |
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| 81 | |
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| 82 | #endif // QHTTPSERVERVIEWTRAITS_H |
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| 83 | |
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