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/****************************************************************************
**
** 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 <QtCore/qglobal.h>
#include <QtCore/qmetatype.h>
#include <QtCore/qnamespace.h>
#include <QtCore/qobjectdefs.h>
#include <functional>
#include <tuple>
#include <type_traits>
QT_BEGIN_NAMESPACE
class QHttpServerRequest;
class QHttpServerResponder;
template <typename ViewHandler>
struct QHttpServerRouterViewTraits : QHttpServerRouterViewTraits<decltype(&ViewHandler::operator())> {};
template <typename ClassType, typename Ret, typename ... Args>
struct QHttpServerRouterViewTraits<Ret(ClassType::*)(Args...) const>
{
static constexpr const int ArgumentCount = sizeof ... (Args);
template <int I>
struct Arg {
using OriginalType = typename std::tuple_element<I, std::tuple<Args...>>::type;
using Type = typename QtPrivate::RemoveConstRef<OriginalType>::Type;
static constexpr int metaTypeId() noexcept {
return qMetaTypeId<
typename std::conditional<
!QMetaTypeId2<Type>::Defined,
void,
Type>::type>();
}
};
private:
// Tools used to check position of special arguments (QHttpServerResponder, QHttpServerRequest)
// and unsupported types
template<bool Last, typename Arg>
static constexpr bool checkArgument() noexcept
{
static_assert(Last || !std::is_same<Arg, const QHttpServerRequest &>::value,
"ViewHandler arguments error: "
"QHttpServerRequest can only be the last argument");
static_assert(Last || !std::is_same<Arg, QHttpServerResponder &&>::value,
"ViewHandler arguments error: "
"QHttpServerResponder can only be the last argument");
static_assert(!std::is_same<Arg, QHttpServerRequest &&>::value,
"ViewHandler arguments error: "
"QHttpServerRequest can only be passed as a const reference");
static_assert(!std::is_same<Arg, QHttpServerRequest &>::value,
"ViewHandler arguments error: "
"QHttpServerRequest can only be passed as a const reference");
static_assert(!std::is_same<Arg, const QHttpServerRequest *>::value,
"ViewHandler arguments error: "
"QHttpServerRequest can only be passed as a const reference");
static_assert(!std::is_same<Arg, QHttpServerRequest const*>::value,
"ViewHandler arguments error: "
"QHttpServerRequest can only be passed as a const reference");
static_assert(!std::is_same<Arg, QHttpServerRequest *>::value,
"ViewHandler arguments error: "
"QHttpServerRequest can only be passed as a const reference");
static_assert(!std::is_same<Arg, QHttpServerResponder &>::value,
"ViewHandler arguments error: "
"QHttpServerResponder can only be passed as a universal reference");
static_assert(!std::is_same<Arg, const QHttpServerResponder *const>::value,
"ViewHandler arguments error: "
"QHttpServerResponder can only be passed as a universal reference");
static_assert(!std::is_same<Arg, const QHttpServerResponder *>::value,
"ViewHandler arguments error: "
"QHttpServerResponder can only be passed as a universal reference");
static_assert(!std::is_same<Arg, QHttpServerResponder const*>::value,
"ViewHandler arguments error: "
"QHttpServerResponder can only be passed as a universal reference");
static_assert(!std::is_same<Arg, QHttpServerResponder *>::value,
"ViewHandler arguments error: "
"QHttpServerResponder can only be passed as a universal reference");
using Type = typename std::remove_cv<typename std::remove_reference<Arg>::type>::type;
static_assert(QMetaTypeId2<Type>::Defined
|| std::is_same<Type, QHttpServerResponder>::value
|| std::is_same<Type, QHttpServerRequest>::value,
"ViewHandler arguments error: "
"Type is not registered, please use the Q_DECLARE_METATYPE macro "
"to make it known to Qt's meta-object system");
return true;
}
public:
template<typename Arg, typename ... ArgX>
struct ArgumentsCheck {
static constexpr bool compileCheck()
{
return checkArgument<false, Arg>() && ArgumentsCheck<ArgX...>::compileCheck();
}
};
template<typename Arg>
struct ArgumentsCheck<Arg> {
static constexpr bool compileCheck()
{
return checkArgument<true, Arg>();
}
};
using Arguments = ArgumentsCheck<Args...>;
private:
// Tools used to compute ArgumentCapturableCount
template<typename T>
static constexpr typename std::enable_if<QMetaTypeId2<T>::Defined, int>::type
capturable()
{ return 1; }
template<typename T>
static constexpr typename std::enable_if<!QMetaTypeId2<T>::Defined, int>::type
capturable()
{ return 0; }
static constexpr std::size_t sum() noexcept { return 0; }
template<typename ... N>
static constexpr std::size_t sum(const std::size_t it, N ... n) noexcept
{ return it + sum(n...); }
public:
static constexpr const std::size_t ArgumentCapturableCount =
sum(capturable<typename QtPrivate::RemoveConstRef<Args>::Type>()...);
static constexpr const std::size_t ArgumentPlaceholdersCount = ArgumentCount
- ArgumentCapturableCount;
private:
// Tools used to get BindableType
template<typename Return, typename ... ArgsX>
struct BindTypeHelper {
using Type = std::function<Return(ArgsX...)>;
};
template<int ... Idx>
static constexpr typename BindTypeHelper<
Ret, typename Arg<ArgumentCapturableCount + Idx>::OriginalType...>::Type
bindTypeHelper(QtPrivate::IndexesList<Idx...>)
{
return BindTypeHelper<Ret,
typename Arg<ArgumentCapturableCount + Idx>::OriginalType...>::Type();
}
public:
using BindableType = decltype(bindTypeHelper(typename QtPrivate::Indexes<
ArgumentPlaceholdersCount>::Value{}));
static constexpr bool IsLastArgRequest = std::is_same<
typename Arg<ArgumentCount - 1>::Type, QHttpServerRequest>::value;
static constexpr bool IsLastArgResponder = std::is_same<
typename Arg<ArgumentCount - 1>::Type, QHttpServerResponder&&>::value;
static constexpr bool IsLastArgNonSpecial = !(IsLastArgRequest || IsLastArgResponder);
};
template <typename ClassType, typename Ret>
struct QHttpServerRouterViewTraits<Ret(ClassType::*)() const>
{
static constexpr const int ArgumentCount = 0;
template <int I>
struct Arg {
using Type = void;
};
static constexpr const std::size_t ArgumentCapturableCount = 0u;
static constexpr const std::size_t ArgumentPlaceholdersCount = 0u;
using BindableType = decltype(std::function<Ret()>{});
static constexpr bool IsLastArgRequest = false;
static constexpr bool IsLastArgResponder = false;
static constexpr bool IsLastArgNonSpecial = true;
struct ArgumentsCheck {
static constexpr bool compileCheck() { return true; }
};
using Arguments = ArgumentsCheck;
};
QT_END_NAMESPACE
#endif // QHTTPSERVERROUTERVIEWTRAITS_H
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