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#pragma once
#include "Assertions.h"
#include "StdLibExtras.h"
namespace AK {
template<class T>
constexpr auto call_will_be_destroyed_if_present(T* object) -> decltype(object->will_be_destroyed(), TrueType { })
{
object->will_be_destroyed();
return { };
}
constexpr auto call_will_be_destroyed_if_present(...) -> FalseType
{
return { };
}
template<class T>
constexpr auto call_one_retain_left_if_present(T* object) -> decltype(object->one_retain_left(), TrueType { })
{
object->one_retain_left();
return { };
}
constexpr auto call_one_retain_left_if_present(...) -> FalseType
{
return { };
}
template<typename T>
class Retainable {
public:
void retain()
{
ASSERT(m_retain_count);
++m_retain_count;
}
void release()
{
ASSERT(m_retain_count);
--m_retain_count;
if (m_retain_count == 0) {
call_will_be_destroyed_if_present(static_cast<T*>(this));
delete static_cast<T*>(this);
} else if (m_retain_count == 1) {
call_one_retain_left_if_present(static_cast<T*>(this));
}
}
int retain_count() const
{
return m_retain_count;
}
protected:
Retainable() { }
~Retainable()
{
ASSERT(!m_retain_count);
}
private:
int m_retain_count { 1 };
};
}
using AK::Retainable;
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