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#pragma once
/** An RAII wrapper for std::atomic<T*>. */
template <typename T>
class cAtomicUniquePtr
{
public:
static_assert(!std::is_array<T>::value, "cAtomicUniquePtr does not support arrays");
DISALLOW_COPY_AND_ASSIGN(cAtomicUniquePtr);
cAtomicUniquePtr() NOEXCEPT:
m_Ptr(nullptr)
{
}
cAtomicUniquePtr(std::unique_ptr<T> a_Ptr) NOEXCEPT:
m_Ptr(a_Ptr.release())
{
}
cAtomicUniquePtr & operator = (std::unique_ptr<T> a_Ptr) NOEXCEPT
{
store(std::move(a_Ptr));
return *this;
}
~cAtomicUniquePtr() NOEXCEPT
{
delete load();
}
operator T * () const NOEXCEPT
{
return load();
}
bool compare_exchange_weak(T *& a_Expected, std::unique_ptr<T> && a_Desired, std::memory_order a_Order = std::memory_order_seq_cst) NOEXCEPT
{
bool DidExchange = m_Ptr.compare_exchange_weak(a_Expected, a_Desired.get(), a_Order);
if (DidExchange)
{
// Only release ownership from the caller if the exchange occurred
a_Desired.release();
}
return DidExchange;
}
bool compare_exchange_strong(T *& a_Expected, std::unique_ptr<T> && a_Desired, std::memory_order a_Order = std::memory_order_seq_cst) NOEXCEPT
{
bool DidExchange = m_Ptr.compare_exchange_strong(a_Expected, a_Desired.get(), a_Order);
if (DidExchange)
{
// Only release ownership from the caller if the exchange occurred
a_Desired.release();
}
return DidExchange;
}
std::unique_ptr<T> exchange(std::unique_ptr<T> a_Ptr, std::memory_order a_Order = std::memory_order_seq_cst) NOEXCEPT
{
return std::unique_ptr<T>{ m_Ptr.exchange(a_Ptr.release(), a_Order) };
}
T * load(std::memory_order a_Order = std::memory_order_seq_cst) const NOEXCEPT
{
return m_Ptr.load(a_Order);
}
void store(std::unique_ptr<T> a_Ptr, std::memory_order a_Order = std::memory_order_seq_cst) NOEXCEPT
{
// Store new value and delete old value
delete m_Ptr.exchange(a_Ptr.release(), a_Order);
}
private:
std::atomic<T*> m_Ptr;
};
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