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//-----------------------------------------------------------------------------
// Name: referencecounter.h
// Developer: Wolfire Games LLC
// Description:
// License: Read below
//-----------------------------------------------------------------------------
//
// Copyright 2022 Wolfire Games LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//-----------------------------------------------------------------------------
#pragma once
#ifndef NULL
#define NULL 0
#endif
template <typename T>
class ReferenceCounter
{
private:
int* ref_counter;
T* data;
public:
ReferenceCounter():
ref_counter(new int(1)),
data(new T())
{
}
/*
ReferenceCounter(const T& _data):
ref_counter(new int(1)),
data(new T(_data))
{
}
*/
ReferenceCounter( T* _data ):
ref_counter(new int(1)),
data(_data)
{
}
void Set(T* _data) {
*ref_counter -= 1;
if( *ref_counter == 0)
{
delete ref_counter;
if( data ) {
delete data;
}
data = NULL;
ref_counter = NULL;
}
data = _data;
ref_counter = new int(1);
}
ReferenceCounter( const ReferenceCounter<T>& other )
{
data = other.data;
ref_counter = other.ref_counter;
*ref_counter += 1;
}
ReferenceCounter& operator=(const ReferenceCounter<T>& other)
{
if (&other == this)
{
return *this;
}
*ref_counter -= 1;
if( *ref_counter == 0)
{
delete ref_counter;
if( data ) {
delete data;
}
data = NULL;
ref_counter = NULL;
}
data = other.data;
ref_counter = other.ref_counter;
*ref_counter += 1;
return *this;
}
T* operator->()
{
return data;
}
~ReferenceCounter()
{
*ref_counter -= 1;
if( *ref_counter == 0)
{
delete ref_counter;
delete data;
data = NULL;
ref_counter = NULL;
}
}
const T& GetConst() const
{
return *data;
}
T* GetPtr() {
return data;
}
template<typename H>
H* GetPtr() {
return static_cast<H*>(data);
}
template<typename H>
const H* GetConstPtr() const {
return static_cast<H*>(data);
}
const bool Valid() const {
return data != NULL;
}
int GetReferenceCount() const {
return ref_counter ? *ref_counter : 0;
}
};
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