mirror of
https://github.com/matrix-construct/construct
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82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
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/*
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* charybdis: 21st Century IRC++d
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* util.h: Miscellaneous utilities
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*
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* Copyright (C) 2016 Charybdis Development Team
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* Copyright (C) 2016 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.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#pragma once
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#define HAVE_IRCD_BYTE_VIEW_H
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namespace ircd
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{
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template<class T = string_view> struct byte_view;
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template<> struct byte_view<string_view>;
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}
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/// string_view -> bytes
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template<class T>
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struct ircd::byte_view
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{
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string_view s;
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operator const T &() const
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{
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if(unlikely(sizeof(T) > s.size()))
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throw std::bad_cast();
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return *reinterpret_cast<const T *>(s.data());
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}
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byte_view(const string_view &s = {})
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:s{s}
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{
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if(unlikely(sizeof(T) > s.size()))
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throw std::bad_cast();
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}
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// bytes -> bytes (completeness)
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byte_view(const T &t)
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:s{byte_view<string_view>{t}}
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{}
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};
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/// bytes -> string_view. A byte_view<string_view> is raw data of byte_view<T>.
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///
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/// This is an important specialization to take note of. When you see
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/// byte_view<string_view> know that another type's bytes are being represented
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/// by the string_view if that type is not string_view family itself.
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template<>
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struct ircd::byte_view<ircd::string_view>
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:string_view
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{
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template<class T,
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typename std::enable_if<!std::is_base_of<std::string_view, T>::value, int *>::type = nullptr>
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byte_view(const T &t)
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:string_view{reinterpret_cast<const char *>(&t), sizeof(T)}
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{}
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/// string_view -> string_view (completeness)
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byte_view(const string_view &t)
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:string_view{t}
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{}
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};
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