defer.h

// Copyright (c) 2026. DistroRickDev
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA

#ifndef DEFER_H
#define DEFER_H

template <typename DeferrableCall>
struct Defer {
    explicit Defer(const DeferrableCall &call) : call(call) {}
    Defer(const Defer&) = delete;
    Defer(Defer&&) = delete;
    Defer& operator=(const Defer&) = delete;
    Defer& operator=(Defer&&) = delete;
    ~Defer() {
        call();
    }

    private:
        DeferrableCall call;
};


#define CONCAT_DEFER_UID_ARGS(a, b) a##b
#define GENERATE_DEFER_UID(a, b) CONCAT_DEFER_UID_ARGS(a, b)
#define DEFER_UID GENERATE_DEFER_UID(def, __COUNTER__)

#if (__cplusplus > 201402L) // If C++ is >= 17
#define defer(CALL, ...) [[maybe_unused]] const auto DEFER_UID = Defer([__VA_ARGS__]{ CALL(__VA_ARGS__); });

#else
#define defer(CALL, ...) __attribute__((unused)) const auto DEFER_UID = Defer([__VA_ARGS__]{ CALL(__VA_ARGS__); }); \

#endif


#endif //DEFER_H