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