mirror of
https://github.com/matrix-construct/construct
synced 2024-06-25 21:38:18 +02:00
137 lines
3.3 KiB
C++
137 lines
3.3 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_BUFFER_UNIQUE_BUFFER_H
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/// Like unique_ptr, this template holds ownership of an allocated buffer
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///
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template<class buffer,
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uint alignment>
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struct ircd::buffer::unique_buffer
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:buffer
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{
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buffer release();
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unique_buffer(const size_t &size);
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unique_buffer(std::unique_ptr<char[]> &&, const size_t &size);
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explicit unique_buffer(const buffer &);
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unique_buffer();
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unique_buffer(unique_buffer &&) noexcept;
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unique_buffer(const unique_buffer &) = delete;
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unique_buffer &operator=(unique_buffer &&) noexcept;
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unique_buffer &operator=(const unique_buffer &) = delete;
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~unique_buffer() noexcept;
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};
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template<class buffer,
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uint alignment>
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ircd::buffer::unique_buffer<buffer, alignment>::unique_buffer()
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:buffer
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{
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nullptr, nullptr
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}
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{}
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template<class buffer,
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uint alignment>
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ircd::buffer::unique_buffer<buffer, alignment>::unique_buffer(const buffer &src)
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:buffer{[&src]() -> buffer
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{
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std::unique_ptr<char[]> ret
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{
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new __attribute__((aligned(16))) char[size(src)]
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};
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const mutable_buffer dst
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{
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ret.get(), size(src)
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};
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copy(dst, src);
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return dst;
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}()}
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{
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}
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template<class buffer,
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uint alignment>
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ircd::buffer::unique_buffer<buffer, alignment>::unique_buffer(const size_t &size)
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:unique_buffer<buffer, alignment>
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{
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std::unique_ptr<char[]>
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{
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//TODO: Can't use a template parameter to the attribute even though
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// it's known at compile time. Hardcoding this until fixed with better
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// aligned dynamic memory.
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//new __attribute__((aligned(alignment))) char[size]
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new __attribute__((aligned(16))) char[size]
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},
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size
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}
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{
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// Alignment can only be 16 bytes for now
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assert(alignment == 16);
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}
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template<class buffer,
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uint alignment>
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ircd::buffer::unique_buffer<buffer, alignment>::unique_buffer(std::unique_ptr<char[]> &&b,
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const size_t &size)
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:buffer
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{
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typename buffer::iterator(b.release()), size
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}
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{}
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template<class buffer,
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uint alignment>
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ircd::buffer::unique_buffer<buffer, alignment>::unique_buffer(unique_buffer &&other)
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noexcept
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:buffer
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{
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std::move(static_cast<buffer &>(other))
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}
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{
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get<0>(other) = nullptr;
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}
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template<class buffer,
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uint alignment>
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ircd::buffer::unique_buffer<buffer, alignment> &
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ircd::buffer::unique_buffer<buffer, alignment>::operator=(unique_buffer &&other)
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noexcept
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{
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this->~unique_buffer();
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static_cast<buffer &>(*this) = std::move(static_cast<buffer &>(other));
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get<0>(other) = nullptr;
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return *this;
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}
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template<class buffer,
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uint alignment>
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ircd::buffer::unique_buffer<buffer, alignment>::~unique_buffer()
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noexcept
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{
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delete[] data(*this);
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}
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template<class buffer,
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uint alignment>
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buffer
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ircd::buffer::unique_buffer<buffer, alignment>::release()
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{
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const buffer ret{static_cast<buffer>(*this)};
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static_cast<buffer &>(*this) = buffer{};
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return ret;
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}
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