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/*
* Copyright (c) 2009-2020, Albertas Vyšniauskas
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
* * Neither the name of the software author nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
* IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef GPICK_COMMON_REF_H_
#define GPICK_COMMON_REF_H_
#include <cstdint>
#include <iostream>
namespace common {
template<typename T>
struct Ref {
struct Counter {
Counter():
m_referenceCounter(1) {
}
virtual ~Counter() {
if (m_referenceCounter > 1) {
std::cerr << "Referenced value destroyed [address: " << this << ", reference count: " << m_referenceCounter << "]\n";
}
}
T *reference() {
m_referenceCounter++;
return reinterpret_cast<T *>(this);
}
bool release() {
if (m_referenceCounter > 1) {
m_referenceCounter--;
return false;
} else {
delete this;
return true;
}
}
uint32_t references() const {
return m_referenceCounter;
}
private:
uint32_t m_referenceCounter;
};
Ref():
m_value(nullptr) {
}
Ref(T *value):
m_value(value) {
}
Ref(const Ref<T> &reference):
m_value(reference.m_value->reference()) {
}
Ref(Ref<T> &&reference):
m_value(reference.m_value) {
reference.m_value = nullptr;
}
Ref &operator=(const Ref<T> &reference) {
if (m_value)
m_value->release();
m_value = reference.m_value->reference();
return *this;
}
~Ref() {
if (m_value)
m_value->release();
}
bool release() {
bool result = true;
if (m_value)
result = m_value->release();
m_value = nullptr;
return result;
}
explicit operator bool() const {
return m_value != nullptr;
}
bool operator==(const Ref<T> &reference) const {
return m_value == reference.m_value;
}
T &operator*() {
return *m_value;
}
const T &operator*() const {
return *m_value;
}
T *operator->() {
return m_value;
}
const T *operator->() const {
return m_value;
}
uint32_t references() const {
return m_value ? m_value->references() : 0;
}
private:
T *m_value;
};
}
#endif /* GPICK_COMMON_REF_H_ */
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