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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 QHTTPSERVERROUTERVIEWTRAITS_H
#define QHTTPSERVERROUTERVIEWTRAITS_H
#include <QtHttpServer/qhttpserverviewtraits_impl.h>
QT_BEGIN_NAMESPACE
class QHttpServerRequest;
class QHttpServerResponder;
namespace QtPrivate {
template<typename ViewHandler, bool DisableStaticAssert>
struct RouterViewTraitsHelper : ViewTraits<ViewHandler, DisableStaticAssert> {
using VTraits = ViewTraits<ViewHandler, DisableStaticAssert>;
using FunctionTraits = typename VTraits::FTraits;
template<int I>
struct ArgumentChecker : FunctionTraits::template Arg<I> {
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 IsResponder = typename VTraits::template Special<I, QHttpServerResponder &&>;
static_assert(IsResponder::AssertCondition,
"ViewHandler arguments error: "
"QHttpServerResponder can only be passed as a universal reference");
using IsSpecial = CheckAny<IsRequest, IsResponder>;
struct IsSimple {
static constexpr bool Value = !IsSpecial::Value &&
I < FunctionTraits::ArgumentCount &&
FunctionTraits::ArgumentIndexMax != -1;
static constexpr bool Valid = FunctionTraits::template Arg<I>::Defined;
static constexpr bool StaticAssert =
DisableStaticAssert || !Value || Valid;
static_assert(StaticAssert,
"ViewHandler arguments error: "
"Type is not registered, please use the Q_DECLARE_METATYPE macro "
"to make it known to Qt's meta-object system");
};
using CheckOk = CheckAny<IsSimple, IsSpecial>;
static constexpr bool Valid = CheckOk::Valid;
static constexpr bool StaticAssert = CheckOk::StaticAssert;
};
struct Arguments {
template<int ... I>
struct ArgumentsReturn {
template<int Idx>
using Arg = ArgumentChecker<Idx>;
template<int Idx>
static constexpr int metaTypeId() noexcept
{
using Type = typename FunctionTraits::template Arg<Idx>::CleanType;
return qMetaTypeId<
typename std::conditional<
QMetaTypeId2<Type>::Defined,
Type,
void>::type>();
}
static constexpr std::size_t Count = FunctionTraits::ArgumentCount;
static constexpr std::size_t CapturableCount =
StaticMath::Sum::eval(
static_cast<std::size_t>(FunctionTraits::template Arg<I>::Defined)...);
static constexpr std::size_t PlaceholdersCount = Count - CapturableCount;
static constexpr bool Valid = StaticMath::And::eval(Arg<I>::Valid...);
static constexpr bool StaticAssert =
StaticMath::And::eval(Arg<I>::StaticAssert...);
using Indexes = typename QtPrivate::IndexesList<I...>;
using CapturableIndexes =
typename QtPrivate::Indexes<CapturableCount>::Value;
using PlaceholdersIndexes =
typename QtPrivate::Indexes<PlaceholdersCount>::Value;
using Last = Arg<FunctionTraits::ArgumentIndexMax>;
};
template<int ... I>
static constexpr ArgumentsReturn<I...> eval(QtPrivate::IndexesList<I...>) noexcept
{
return ArgumentsReturn<I...>{};
}
};
template<int CaptureOffset>
struct BindType {
template<typename ... Args>
struct FunctionWrapper {
using Type = std::function<typename FunctionTraits::ReturnType (Args...)>;
};
template<int Id>
using OffsetArg = typename FunctionTraits::template Arg<CaptureOffset + Id>::Type;
template<int ... Idx>
static constexpr typename FunctionWrapper<OffsetArg<Idx>...>::Type
eval(QtPrivate::IndexesList<Idx...>) noexcept;
};
};
} // namespace QtPrivate
template <typename ViewHandler, bool DisableStaticAssert = false>
struct QHttpServerRouterViewTraits
{
using Helpers = typename QtPrivate::RouterViewTraitsHelper<ViewHandler, DisableStaticAssert>;
using ReturnType = typename Helpers::FunctionTraits::ReturnType;
using Arguments = decltype(Helpers::Arguments::eval(typename Helpers::ArgumentIndexes{}));
using BindableType = decltype(
Helpers::template BindType<Arguments::CapturableCount>::eval(
typename Arguments::PlaceholdersIndexes{}));
};
QT_END_NAMESPACE
#endif // QHTTPSERVERROUTERVIEWTRAITS_H
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