finalizer.h

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#ifndef GUL14_FINALIZER_H_
#define GUL14_FINALIZER_H_
 
#include <type_traits>
#include <utility>
#include "gul14/internal.h"
 
namespace gul14 {
 
template <typename F>
class FinalAction
{
    F action_;
    bool invoke_ {true};
 
public:
    explicit FinalAction(F f) noexcept
        : action_(std::move(f))
    {}
    FinalAction(FinalAction&& other) noexcept
        : action_{ std::move(other.action_) }
        , invoke_{ other.invoke_ }
    {
        // don't call callback on moved from FinalAction
        other.invoke_ = false;
    }
    FinalAction& operator=(FinalAction&& other) noexcept {
        if (this != &other) {
            this->action_ = std::move(other.action_);
            this->invoke_ = std::move(other.invoke_);
            // don't call callback on moved from FinalAction
            other.invoke_ = false;
        }
        return *this;
    }
 
    FinalAction() = delete; 
    FinalAction(const FinalAction&) = delete; 
    FinalAction& operator=(const FinalAction&) = delete; 
 
    ~FinalAction() noexcept {
        if (invoke_)
            action_();
    }
};
 
template <typename F>
FinalAction<typename std::decay_t<F>> finally(F&& f) noexcept {
    return FinalAction<typename std::decay_t<F>>(std::forward<typename std::decay_t<F>>(f));
}
 
} // namespace gul14
 
#endif
 
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