scope_exit.h

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#pragma once

 
#include "fl/stl/type_traits.h"
#include "fl/stl/noexcept.h"
 
namespace fl {

template <typename EF>
class scope_exit {
public:
    template <typename EFP>
    explicit scope_exit(EFP &&f)
        : mExitFunction(fl::forward<EFP>(f)), mActive(true) {}
 
    scope_exit(scope_exit &&rhs) FL_NOEXCEPT
        : mExitFunction(fl::move(rhs.mExitFunction)), mActive(rhs.mActive) {
        rhs.release();
    }
 
    scope_exit(const scope_exit &) FL_NOEXCEPT = delete;
    scope_exit &operator=(const scope_exit &) FL_NOEXCEPT = delete;
    scope_exit &operator=(scope_exit &&) FL_NOEXCEPT = delete;
 
    ~scope_exit() FL_NOEXCEPT {
        if (mActive) {
            mExitFunction();
        }
    }
 
    void release() FL_NOEXCEPT { mActive = false; }
 
private:
    EF mExitFunction;
    bool mActive;
};

template <typename EF>
scope_exit<decay_t<EF>> make_scope_exit(EF &&f) {
    return scope_exit<decay_t<EF>>(fl::forward<EF>(f));
}
 
} // namespace fl