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/*
* Copyright (C) 2020 Boris Pek <tehnick-8@yandex.ru>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <cstddef>
namespace dcpp
{
template<typename T>
class intrusive_ptr
{
typedef intrusive_ptr value_type;
public:
constexpr intrusive_ptr() noexcept : ptr_(nullptr) { }
intrusive_ptr(T* val, bool add_ref = true): ptr_(val) {
if(ptr_ && add_ref)
intrusive_ptr_add_ref(ptr_);
}
intrusive_ptr(const intrusive_ptr& other): ptr_(other.ptr_) {
if(ptr_)
intrusive_ptr_add_ref(ptr_);
}
~intrusive_ptr() {
if(ptr_)
intrusive_ptr_release(ptr_);
}
intrusive_ptr(intrusive_ptr&& other) noexcept : ptr_(other.ptr_) {
other.ptr_ = nullptr;
}
intrusive_ptr& operator=(intrusive_ptr&& other) noexcept {
value_type(static_cast<intrusive_ptr&&>(other)).swap(*this);
return *this;
}
intrusive_ptr& operator=(const intrusive_ptr& other) {
value_type(other).swap(*this);
return *this;
}
intrusive_ptr& operator=(T* val) {
value_type(val).swap(*this);
return *this;
}
void reset() {
value_type().swap(*this);
}
void reset(T* val) {
value_type(val).swap(*this);
}
T* get() const noexcept {
return ptr_;
}
T& operator*() const noexcept {
return *ptr_;
}
T* operator->() const noexcept {
return ptr_;
}
explicit operator bool() const noexcept {
return (ptr_ != 0);
}
void swap(intrusive_ptr& other) noexcept {
T* tmp = ptr_;
ptr_ = other.ptr_;
other.ptr_ = tmp;
}
private:
T* ptr_;
};
template<typename T, typename U>
bool operator==(const intrusive_ptr<T>& t, const intrusive_ptr<U>& u) noexcept {
return (t.get() == u.get());
}
template<typename T, typename U>
bool operator==(const intrusive_ptr<T>& t, U* u) noexcept {
return (t.get() == u);
}
template<typename T, typename U>
bool operator==(T* t, const intrusive_ptr<U>& u) noexcept {
return (t == u.get());
}
template<typename T>
bool operator==(const intrusive_ptr<T>& p, nullptr_t) noexcept {
return (p.get() == 0);
}
template<typename T>
bool operator==(nullptr_t, const intrusive_ptr<T>& p) noexcept {
return (p.get() == 0);
}
template<typename T, typename U>
bool operator!=(const intrusive_ptr<T>& t, const intrusive_ptr<U>& u) noexcept {
return (t.get() != u.get());
}
template<typename T, typename U>
bool operator!=(const intrusive_ptr<T>& t, U* u) noexcept {
return (t.get() != u);
}
template<typename T, typename U>
bool operator!=(T* t, const intrusive_ptr<U>& u) noexcept {
return (t != u.get());
}
template<typename T>
bool operator!=(const intrusive_ptr<T>& p, nullptr_t) noexcept {
return (p.get() != 0);
}
template<typename T>
bool operator!=(nullptr_t, const intrusive_ptr<T>& p) noexcept {
return (p.get() != 0);
}
template<typename T>
bool operator<(const intrusive_ptr<T>& t, const intrusive_ptr<T>& u) noexcept {
return std::less<T*>()(t.get(), u.get());
}
template<typename T>
std::size_t hash_value(const intrusive_ptr<T>& p) noexcept {
return std::hash<T*>()(p.get());
}
} // namespace dcpp
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