construct/include/ircd/buffer/shared_buffer.h

// Matrix Construct
//
// Copyright (C) Matrix Construct Developers, Authors & Contributors
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.

#pragma once
#define HAVE_IRCD_BUFFER_SHARED_BUFFER_H

/// Like shared_ptr, this template shares ownership of an allocated buffer
///
template<class buffer>
struct ircd::buffer::shared_buffer
:std::shared_ptr<char>
,buffer
{
	shared_buffer(const size_t &size);
	explicit shared_buffer(const const_buffer &);
	shared_buffer() = default;
	shared_buffer(shared_buffer &&) = default;
	shared_buffer(const shared_buffer &) = default;
	shared_buffer &operator=(shared_buffer &&) = default;
	shared_buffer &operator=(const shared_buffer &) = default;
};

template<class buffer>
ircd::buffer::shared_buffer<buffer>::shared_buffer(const size_t &size)
:std::shared_ptr<char>
{
	new __attribute__((aligned(16))) char[size],
	std::default_delete<char[]>()
}
,buffer
{
	this->std::shared_ptr<char>::get(), size
}
{}

template<class buffer>
ircd::buffer::shared_buffer<buffer>::shared_buffer(const const_buffer &src)
:shared_buffer
{
	size(src)
}
{
	const mutable_buffer dst{data(*this), size(*this)};
	assert(size(dst) == size(src));
	copy(dst, src);
}