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/*
* Copyright (C) 2006-2019 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#pragma once
#include <memory>
namespace WTF {
enum HashTableDeletedValueType { HashTableDeletedValue };
enum HashTableEmptyValueType { HashTableEmptyValue };
template <typename T> inline T* getPtr(T* p) { return p; }
template <typename T> struct IsSmartPtr {
static constexpr bool value = false;
static constexpr bool isNullable = true;
};
template<typename T>
inline constexpr bool IsSmartPtrV = IsSmartPtr<T>::value;
template<typename T>
inline constexpr bool IsSmartPtrNullableV = IsSmartPtr<T>::isNullable;
template<typename T>
concept SmartPtr = IsSmartPtrV<T>;
template<typename T>
concept NonNullableSmartPtr = SmartPtr<T> && !IsSmartPtrNullableV<T>;
template <typename T, bool isSmartPtr>
struct GetPtrHelperBase;
template <typename T>
struct GetPtrHelperBase<T, false /* isSmartPtr */> {
using PtrType = T*;
using UnderlyingType = T;
static T* getPtr(T& p) { return std::addressof(p); }
};
template <typename T>
struct GetPtrHelperBase<T, true /* isSmartPtr */> {
using PtrType = typename T::PtrType;
using UnderlyingType = typename T::ValueType;
static PtrType getPtr(const T& p) { return p.get(); }
};
template <typename T>
struct GetPtrHelper : GetPtrHelperBase<T, IsSmartPtr<T>::value> {
};
template <typename T>
inline typename GetPtrHelper<T>::PtrType getPtr(T& p)
{
return GetPtrHelper<T>::getPtr(p);
}
template <typename T>
inline typename GetPtrHelper<T>::PtrType getPtr(const T& p)
{
return GetPtrHelper<T>::getPtr(p);
}
// Explicit specialization for C++ standard library types.
template <typename T, typename Deleter> struct IsSmartPtr<std::unique_ptr<T, Deleter>> {
static constexpr bool value = true;
static constexpr bool isNullable = true;
};
template <typename T, typename Deleter>
struct GetPtrHelper<std::unique_ptr<T, Deleter>> {
using PtrType = T*;
using UnderlyingType = T;
static T* getPtr(const std::unique_ptr<T, Deleter>& p) { return p.get(); }
};
} // namespace WTF
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