mirror of
https://github.com/matrix-construct/construct
synced 2024-06-30 07:48:22 +02:00
109 lines
2.9 KiB
C++
109 lines
2.9 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_FIXED_BUFFER_H
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/// fixed_buffer wraps an std::array with construction and conversions apropos
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/// the ircd::buffer suite. fixed_buffer should be punnable. Its only memory
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/// footprint is the array itself and
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///
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template<class buffer_type,
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size_t SIZE>
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struct ircd::buffer::fixed_buffer
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:std::array<typename std::remove_const<typename buffer_type::value_type>::type, SIZE>
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{
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using mutable_type = typename std::remove_const<typename buffer_type::value_type>::type;
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using const_type = typename std::add_const<mutable_type>::type;
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using array_type = std::array<mutable_type, SIZE>;
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using proto_type = void (const mutable_buffer &);
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using args_type = const mutable_buffer &;
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operator buffer_type() const noexcept;
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operator buffer_type() noexcept;
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using array_type::array_type;
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template<class F>
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fixed_buffer(F&&,
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typename std::enable_if<std::is_invocable<F, args_type>::value, void>::type * = nullptr);
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explicit fixed_buffer(nullptr_t) noexcept;
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fixed_buffer(const buffer_type &b) noexcept;
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fixed_buffer() = default;
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};
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static_assert
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(
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// Assertion over an arbitrary but common template configuration.
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std::is_standard_layout<ircd::buffer::fixed_buffer<ircd::buffer::const_buffer, 32>>::value,
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"ircd::buffer::fixed_buffer must be standard layout"
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);
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template<class buffer_type,
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size_t SIZE>
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template<class F>
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inline
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ircd::buffer::fixed_buffer<buffer_type, SIZE>::fixed_buffer(F&& closure,
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typename std::enable_if<std::is_invocable<F, args_type>::value, void>::type *)
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{
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const mutable_buffer buf
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{
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reinterpret_cast<mutable_buffer::iterator>(this->data()), SIZE
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};
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closure(buf);
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}
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template<class buffer_type,
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size_t SIZE>
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inline
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ircd::buffer::fixed_buffer<buffer_type, SIZE>::fixed_buffer(const buffer_type &b)
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noexcept
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:array_type
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{
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std::begin(b), std::end(b)
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}
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{}
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template<class buffer_type,
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size_t SIZE>
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inline
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ircd::buffer::fixed_buffer<buffer_type, SIZE>::fixed_buffer(nullptr_t)
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noexcept
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:array_type{{0}}
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{}
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template<class buffer_type,
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size_t SIZE>
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inline
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ircd::buffer::fixed_buffer<buffer_type, SIZE>::operator
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buffer_type()
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noexcept
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{
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return buffer_type
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{
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this->data(), SIZE,
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};
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}
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template<class buffer_type,
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size_t SIZE>
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inline
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ircd::buffer::fixed_buffer<buffer_type, SIZE>::operator
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buffer_type()
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const noexcept
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{
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return buffer_type
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{
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this->data(), SIZE,
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};
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}
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