mirror of
https://git.tesses.org/tesses50/tessesframework.git
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62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
/*
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TessesFramework a library to make C++ easier for me, used in CrossLang:
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https://git.tesses.org/tesses50/crosslang Copyright (C) 2026 Mike Nolan
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "Common.hpp"
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#include "Threading/Mutex.hpp"
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#include <functional>
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namespace Tesses::Framework {
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template <typename T> class Lazy {
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Threading::Mutex mtx;
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T value;
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bool hasInit = false;
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std::function<T()> init;
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std::function<void(T)> free;
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public:
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Lazy(std::function<T()> init, std::function<void(T)> free) {
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this->init = init;
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this->free = free;
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}
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Lazy(std::function<T()> init) : Lazy(init, [](T item) -> void {}) {}
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bool HasInit() {
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mtx.Lock();
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bool hI = this->hasInit;
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mtx.Unlock();
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return hI;
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}
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T &GetValue() {
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mtx.Lock();
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if (hasInit) {
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mtx.Unlock();
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return this->value;
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} else {
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this->value = this->init();
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this->hasInit = true;
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mtx.Unlock();
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return this->value;
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}
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mtx.Unlock();
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}
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~Lazy() {
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if (hasInit)
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this->free(this->value);
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}
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};
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} // namespace Tesses::Framework
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