APimpl.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2025 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#pragma once
 
#include <cstdint>
#include <AUI/Traits/types.h>
 
 
namespace aui {
   template<typename T, std::size_t storageSize, std::size_t storageAlignment = 8>
   struct fast_pimpl {
   public:
       template<typename... Args>
       fast_pimpl(Args&&... args) {
           new (ptr()) T(std::forward<Args>(args)...);
           static_assert(storageSize >= sizeof(T), "not enough size");
           static_assert(storageAlignment % alignof(T) == 0, "alignment does not match");
       }
 
       fast_pimpl(const fast_pimpl& other) {
           new (ptr()) T(other.value());
       }
 
       fast_pimpl(fast_pimpl&& other) noexcept {
           new (ptr()) T(std::move(other.value()));
       }
 
       fast_pimpl& operator=(const fast_pimpl& other) {
           new (ptr()) T(other.value());
           return *this;
       }
 
       fast_pimpl& operator=(fast_pimpl&& other) noexcept {
           new (ptr()) T(std::move(other.value()));
           return *this;
       }
 
       fast_pimpl& operator=(T&& other) noexcept {
           new (ptr()) T(std::move(other));
           return *this;
       }
 
 
       ~fast_pimpl() {
           ptr()->~T();
       }
 
       [[nodiscard]]
       T& value() noexcept {
           return reinterpret_cast<T&>(mStorage);
       }
 
       [[nodiscard]]
       const T& value() const noexcept {
           return reinterpret_cast<const T&>(mStorage);
       }
 
       [[nodiscard]]
       T* ptr() noexcept {
           return &reinterpret_cast<T&>(mStorage);
       }
 
       [[nodiscard]]
       const T* ptr() const noexcept {
           return &reinterpret_cast<const T&>(mStorage);
       }
 
       [[nodiscard]]
       T* operator->() noexcept {
           return &reinterpret_cast<T&>(mStorage);
       }
 
       [[nodiscard]]
       const T* operator->() const noexcept {
           return &reinterpret_cast<const T&>(mStorage);
       }
 
       [[nodiscard]]
       T& operator*() noexcept {
           return reinterpret_cast<T&>(mStorage);
       }
 
       [[nodiscard]]
       const T& operator*() const noexcept {
           return reinterpret_cast<const T&>(mStorage);
       }
 
 
   private:
       std::aligned_storage_t<storageSize, storageAlignment> mStorage;
   };
}

© 2025 AUI Framework Contributors. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. All trademarks are property of their respective owners.