mirror of
https://github.com/matrix-construct/construct
synced 2024-11-25 08:12:37 +01:00
105 lines
3.3 KiB
C++
105 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_MUTABLE_BUFFER_H
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/// Base for mutable buffers, or buffers which can be written to because they
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/// are not const.
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///
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struct ircd::buffer::mutable_buffer
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:buffer<char *>
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{
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// The definition for this is somewhere in one of the .cc files.
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/// Conversion offered for the analogous asio buffer.
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operator boost::asio::mutable_buffer() const noexcept;
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template<class R,
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bool safety = true>
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explicit operator R *() const noexcept(!safety);
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/// Allows boost::spirit to append to the buffer; this means the size() of
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/// this buffer becomes a consumption counter and the real size of the buffer
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/// must be kept separately. This is the lowlevel basis for a stream buffer.
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void insert(char *const &it, const value_type &v);
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using buffer<char *>::buffer;
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template<class T, size_t SIZE> explicit mutable_buffer(T (&)[SIZE]);
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template<size_t SIZE> mutable_buffer(char (&buf)[SIZE]);
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template<size_t SIZE> mutable_buffer(std::array<char, SIZE> &buf);
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mutable_buffer(const std::function<void (const mutable_buffer &)> &);
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explicit mutable_buffer(std::string &buf);
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mutable_buffer(const buffer<char *> &b);
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mutable_buffer() = default;
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};
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inline
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__attribute__((always_inline))
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ircd::buffer::mutable_buffer::mutable_buffer(const buffer<char *> &b)
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:buffer<char *>{b}
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{}
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/// lvalue string reference offered to write through to a std::string as
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/// the buffer. should be hard to bind by accident...
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inline
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__attribute__((always_inline))
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ircd::buffer::mutable_buffer::mutable_buffer(std::string &buf)
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:mutable_buffer{const_cast<char *>(buf.data()), buf.size()}
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{}
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inline
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__attribute__((always_inline))
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ircd::buffer::mutable_buffer::mutable_buffer(const std::function<void (const mutable_buffer &)> &closure)
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{
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closure(*this);
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}
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template<size_t SIZE>
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inline __attribute__((always_inline))
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ircd::buffer::mutable_buffer::mutable_buffer(char (&buf)[SIZE])
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:buffer<char *>{buf, SIZE}
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{}
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template<size_t SIZE>
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inline __attribute__((always_inline))
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ircd::buffer::mutable_buffer::mutable_buffer(std::array<char, SIZE> &buf)
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:buffer<char *>{buf.data(), SIZE}
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{}
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template<class T,
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size_t SIZE>
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inline __attribute__((always_inline))
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ircd::buffer::mutable_buffer::mutable_buffer(T (&buf)[SIZE])
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:buffer<char *>{reinterpret_cast<char *>(buf), SIZE * sizeof(T)}
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{}
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inline void
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ircd::buffer::mutable_buffer::insert(char *const &it,
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const value_type &v)
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{
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assert(it >= this->begin() && it <= this->end());
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memmove(it + 1, it, std::distance(it, this->end()));
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*it = v;
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++std::get<1>(*this);
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}
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template<class R,
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bool safety>
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inline ircd::buffer::mutable_buffer::operator
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R *()
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const noexcept(!safety)
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{
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assert(sizeof(R) <= size(*this));
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if constexpr(safety)
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if(unlikely(sizeof(R) > size(*this)))
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throw std::bad_cast{};
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return reinterpret_cast<const R *>(data(*this));
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}
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