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#pragma once
#include "asl/base/utility.hpp"
#include "asl/base/functional.hpp"
namespace asl
{
template<invocable Callback>
class DeferCallback
{
Callback m_callback;
bool m_moved = false;
public:
template<typename T>
explicit DeferCallback(T&& callback) : m_callback(ASL_FWD(callback))
{
}
ASL_DELETE_COPY(DeferCallback);
DeferCallback(DeferCallback&& other) :
m_callback(ASL_MOVE(other.m_callback)), m_moved(exchange(other.m_moved, true))
{
}
DeferCallback& operator=(DeferCallback&&) = delete;
~DeferCallback()
{
if (!m_moved) { invoke(m_callback); }
}
};
struct DeferFactory
{
template<invocable Callback>
DeferCallback<Callback> operator<<(Callback&& callback) const
{
return DeferCallback<Callback>(ASL_FWD(callback));
}
};
} // namespace asl
#define ASL_DEFER auto ASL_CONCAT(_defer_, __COUNTER__) = ::asl::DeferFactory{} <<
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