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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** 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 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** 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.
**
****************************************************************************/
#pragma once
#include <tuple>
namespace Utils {
// for callables. defined below.
template <typename Callable>
struct functionTraits;
// function
template <typename Result, typename... Args>
struct functionTraits<Result(Args...)>
{
using ResultType = Result;
static const unsigned arity = sizeof...(Args); // TODO const -> constexpr with MSVC2015
template <unsigned i>
struct argument
{
using type = typename std::tuple_element<i, std::tuple<Args...>>::type;
};
};
// function pointer
template <typename Result, typename... Args>
struct functionTraits<Result(*)(Args...)> : public functionTraits<Result(Args...)>
{
};
// const function pointer
template <typename Result, typename... Args>
struct functionTraits<Result(* const)(Args...)> : public functionTraits<Result(Args...)>
{
};
// member function
template <typename Type, typename Result, typename... Args>
struct functionTraits<Result(Type::*)(Args...)> : public functionTraits<Result(Type&,Args...)>
{
};
// const member function
template <typename Type, typename Result, typename... Args>
struct functionTraits<Result(Type::*)(Args...) const> : public functionTraits<Result(Type&,Args...)>
{
};
// const pointer to member function
template <typename Type, typename Result, typename... Args>
struct functionTraits<Result(Type::* const)(Args...)> : public functionTraits<Result(Type&,Args...)>
{
};
// const pointer to const member function
template <typename Type, typename Result, typename... Args>
struct functionTraits<Result(Type::* const)(Args...) const> : public functionTraits<Result(Type&,Args...)>
{
};
// TODO: enable lvalue and rvalue ref member function later (MSVC 2015?)
//// lvalue ref member function
//template <typename Type, typename Result, typename... Args>
//struct functionTraits<Result(Type::*)(Args...) &> : public functionTraits<Result(Type&,Args...)>
//{
//};
//// const lvalue ref member function
//template <typename Type, typename Result, typename... Args>
//struct functionTraits<Result(Type::*)(Args...) const &> : public functionTraits<Result(Type&,Args...)>
//{
//};
//// rvalue ref member function
//template <typename Type, typename Result, typename... Args>
//struct functionTraits<Result(Type::*)(Args...) &&> : public functionTraits<Result(Type&,Args...)>
//{
//};
// callables. only works if operator() is not overloaded.
template <typename Callable>
struct functionTraits
{
using callableTraits = functionTraits<decltype(&Callable::operator())>;
using ResultType = typename callableTraits::ResultType;
static const unsigned arity = callableTraits::arity - 1; // ignore object pointer arg // TODO const -> constexpr with MSVC2015
template <unsigned i>
struct argument
{
using type = typename callableTraits::template argument<i+1>::type; // ignore object pointer arg
};
};
// lvalue ref callables
template <typename Callable>
struct functionTraits<Callable&> : public functionTraits<Callable>
{
};
// const lvalue ref callables
template <typename Callable>
struct functionTraits<const Callable&> : public functionTraits<Callable>
{
};
// rvalue ref callables
template <typename Callable>
struct functionTraits<Callable&&> : public functionTraits<Callable>
{
};
} // Utils
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