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#pragma once
#include <optional>
#include <utility>
/// ScopedGuard provides an object which runs a function (usually a lambda) when
/// it goes out of scope. This can be useful for releasing resources or handles
/// which do not normally have C++ types to automatically release.
template<typename T>
class ScopedGuard final
{
public:
ALWAYS_INLINE ScopedGuard(T&& func) : m_func(std::forward<T>(func)) {}
ALWAYS_INLINE ScopedGuard(ScopedGuard&& other) : m_func(std::move(other.m_func)) { other.m_func = nullptr; }
ALWAYS_INLINE ~ScopedGuard() { Invoke(); }
ScopedGuard(const ScopedGuard&) = delete;
void operator=(const ScopedGuard&) = delete;
/// Prevents the function from being invoked when we go out of scope.
ALWAYS_INLINE void Cancel() { m_func.reset(); }
/// Explicitly fires the function.
ALWAYS_INLINE void Invoke()
{
if (!m_func.has_value())
return;
m_func.value()();
m_func.reset();
}
private:
std::optional<T> m_func;
};
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