scope_exit.hpp

// By Emil Ernerfeldt 2015-2017
// LICENSE:
//   This software is dual-licensed to the public domain and under the following
//   license: you are granted a perpetual, irrevocable license to copy, modify,
//   publish, and distribute this file as you see fit.

#pragma once

namespace emilib {

template<class Fun>
class ScopeGuard
{
public:
    explicit ScopeGuard(Fun f) : _fun(std::move(f)), _active(true) {}

    ~ScopeGuard() noexcept(false)
    {
        if (_active) {
            _fun();
        }
    }

    void dismiss() { _active = false; }
    ScopeGuard() = delete;
    ScopeGuard(const ScopeGuard&) = delete;
    ScopeGuard& operator=(const ScopeGuard&) = delete;

    ScopeGuard(ScopeGuard && rhs) : _fun(std::move(rhs._fun)), _active(rhs._active)
    {
        rhs.dismiss();
    }

private:
    Fun  _fun;
    bool _active;
};

template<class Fun>
ScopeGuard<Fun> make_scope_guard(Fun f)
{
    return ScopeGuard<Fun>(std::move(f));
}

namespace detail {
    enum class ScopeGuardOnExit { };

    template<typename Fun>
    ScopeGuard<Fun> operator+(ScopeGuardOnExit, Fun&& fn)
    {
        return ScopeGuard<Fun>(std::forward<Fun>(fn));
    }
} // namespace detail

#define SCOPE_EXIT \
 auto LOGURU_ANONYMOUS_VARIABLE(scope_guard_) = ::emilib::detail::ScopeGuardOnExit() + [&]()

} // namespace emilib