mirror of
https://github.com/matrix-construct/construct
synced 2024-11-16 06:51:08 +01:00
112 lines
3.2 KiB
C++
112 lines
3.2 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_CONST_BUFFER_H
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struct ircd::buffer::const_buffer
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:buffer<const char *>
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{
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// Definition for this is somewhere in the .cc files where boost is incl.
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operator boost::asio::const_buffer() const noexcept;
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template<class R,
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bool safety = true>
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explicit operator const R *() const noexcept(!safety);
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// For boost::spirit conceptual compliance; illegal/noop
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void insert(const char *const &, const char &);
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using buffer<const char *>::buffer;
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template<class T, size_t SIZE> explicit const_buffer(const T (&)[SIZE]);
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template<size_t SIZE> const_buffer(const char (&buf)[SIZE]);
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template<size_t SIZE> const_buffer(const std::array<char, SIZE> &buf);
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const_buffer(const buffer<const char *> &b);
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const_buffer(const buffer<char *> &b, const size_t &);
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const_buffer(const buffer<char *> &b);
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const_buffer(const mutable_buffer &b);
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const_buffer(const string_view &s);
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const_buffer() = default;
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};
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inline
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__attribute__((always_inline))
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ircd::buffer::const_buffer::const_buffer(const buffer<const char *> &b)
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:buffer<const char *>{b}
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{}
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inline
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__attribute__((always_inline))
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ircd::buffer::const_buffer::const_buffer(const buffer<char *> &b)
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:buffer<const char *>{data(b), size(b)}
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{}
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inline
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__attribute__((always_inline))
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ircd::buffer::const_buffer::const_buffer(const buffer<char *> &b,
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const size_t &max)
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:buffer<const char *>{{data(b), size(b)}, max}
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{}
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inline
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__attribute__((always_inline))
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ircd::buffer::const_buffer::const_buffer(const mutable_buffer &b)
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:buffer<const char *>{data(b), size(b)}
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{}
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inline
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__attribute__((always_inline))
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ircd::buffer::const_buffer::const_buffer(const string_view &s)
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:buffer<const char *>{data(s), size(s)}
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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::const_buffer::const_buffer(const char (&buf)[SIZE])
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:buffer<const 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::const_buffer::const_buffer(const std::array<char, SIZE> &buf)
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:buffer<const char *>{reinterpret_cast<const 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::const_buffer::const_buffer(const T (&buf)[SIZE])
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:buffer<const char *>{reinterpret_cast<const char *>(buf), SIZE * sizeof(T)}
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{}
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#ifndef _NDEBUG
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__attribute__((noreturn))
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#endif
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inline void
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ircd::buffer::const_buffer::insert(const char *const &,
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const char &)
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{
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assert(0);
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__builtin_unreachable();
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}
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template<class R,
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bool safety>
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inline ircd::buffer::const_buffer::operator
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const 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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