110 lines
4.3 KiB
C++
110 lines
4.3 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2020 Mikhail Svetkin <mikhail.svetkin@gmail.com>
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** Copyright (C) 2019 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtHttpServer module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:GPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 or (at your option) any later version
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** approved by the KDE Free Qt Foundation. The licenses are as published by
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** the Free Software Foundation and appearing in the file LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QHTTPSERVERVIEWTRAITS_H
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#define QHTTPSERVERVIEWTRAITS_H
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#include <QtHttpServer/qhttpserverviewtraits_impl.h>
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QT_BEGIN_NAMESPACE
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class QHttpServerRequest;
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class QHttpServerResponse;
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namespace QtPrivate {
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template <typename ViewHandler, bool DisableStaticAssert>
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struct AfterRequestViewTraitsHelper : ViewTraits<ViewHandler, DisableStaticAssert> {
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using VTraits = ViewTraits<ViewHandler, DisableStaticAssert>;
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using FunctionTraits = typename VTraits::FTraits;
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static_assert(DisableStaticAssert ||
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FunctionTraits::ArgumentCount == 2 ||
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FunctionTraits::ArgumentCount == 1,
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"ViewHandler arguments error: "
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"afterRequest can only accept QHttpServerResponse and QHttpServerRequest");
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static_assert(DisableStaticAssert ||
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std::is_same<typename FunctionTraits::ReturnType,
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QHttpServerResponse>::value,
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"ViewHandler return type error: "
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"Return type can only be QHttpServerResponse");
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template<int I>
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struct ArgumentChecker {
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using IsRequest = typename VTraits::template Special<I, const QHttpServerRequest &>;
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static_assert(IsRequest::AssertCondition,
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"ViewHandler arguments error: "
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"QHttpServerRequest can only be passed as a const reference");
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using IsResponse = typename VTraits::template Special<I, QHttpServerResponse &&>;
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static_assert(IsResponse::AssertCondition,
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"ViewHandler arguments error: "
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"QHttpServerResponse can only be passed as a universal reference");
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using IsSpecial = CheckAny<IsRequest, IsResponse>;
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static constexpr bool Valid = IsSpecial::Valid;
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static constexpr bool StaticAssert = IsSpecial::StaticAssert;
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};
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struct Arguments {
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template<int ... I>
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struct ArgumentsReturn {
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template<int Idx>
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using Arg = ArgumentChecker<Idx>;
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static constexpr bool Valid = QtPrivate::StaticMath::And::eval(Arg<I>::Valid...);
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static constexpr bool StaticAssert = QtPrivate::StaticMath::And::eval(
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Arg<I>::StaticAssert...);
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using Last = Arg<FunctionTraits::ArgumentIndexMax>;
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static constexpr std::size_t Count = FunctionTraits::ArgumentCount;
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};
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template<int ... I>
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static constexpr ArgumentsReturn<I...> eval(QtPrivate::IndexesList<I...>) noexcept
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{
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return ArgumentsReturn<I...>{};
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}
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};
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};
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} // namespace QtPrivate
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template <typename ViewHandler, bool DisableStaticAssert = false>
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struct QHttpServerAfterRequestViewTraits
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{
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using Helpers = typename QtPrivate::AfterRequestViewTraitsHelper<ViewHandler, DisableStaticAssert>;
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using Arguments = decltype(Helpers::Arguments::eval(typename Helpers::ArgumentIndexes{}));
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};
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QT_END_NAMESPACE
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#endif // QHTTPSERVERVIEWTRAITS_H
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