KisLazyValueWrapper.h

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/*
 *  SPDX-FileCopyrightText: 2023 Dmitry Kazakov <dimula73@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
#ifndef KISLAZYVALUEWRAPPER_H
#define KISLAZYVALUEWRAPPER_H
 
#include <functional>
 
template <typename T>
struct KisLazyValueWrapper
{
    using value_type = T;
 
    KisLazyValueWrapper() = default;
 
    explicit KisLazyValueWrapper(std::function<value_type()> func) {
        value = func();
    }
 
    ~KisLazyValueWrapper() = default;
 
    operator const value_type&() const {
        return value;
    }
 
    KisLazyValueWrapper(const KisLazyValueWrapper&rhs) = delete;
    KisLazyValueWrapper& operator=(const KisLazyValueWrapper&rhs) = delete;
 
    KisLazyValueWrapper(KisLazyValueWrapper&&rhs) = default;
    KisLazyValueWrapper& operator=(KisLazyValueWrapper&&rhs) = default;
 
    value_type value {};
};
 
#endif // KISLAZYVALUEWRAPPER_H