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c17676a9be
Removes all manual header groupings from source and header files by leveraging clang-format options.
104 lines
2.6 KiB
C++
104 lines
2.6 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of Beast: https://github.com/vinniefalco/Beast
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Copyright 2014, Vinnie Falco <vinnie.falco@gmail.com>
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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 appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef BEAST_HASH_XXHASHER_H_INCLUDED
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#define BEAST_HASH_XXHASHER_H_INCLUDED
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#include <boost/endian/conversion.hpp>
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#include <xxhash.h>
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#include <cstddef>
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#include <new>
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#include <type_traits>
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namespace beast {
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class xxhasher
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{
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private:
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// requires 64-bit std::size_t
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static_assert(sizeof(std::size_t) == 8, "");
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XXH3_state_t* state_;
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static XXH3_state_t*
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allocState()
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{
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auto ret = XXH3_createState();
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if (ret == nullptr)
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throw std::bad_alloc();
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return ret;
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}
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public:
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using result_type = std::size_t;
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static constexpr auto const endian = boost::endian::order::native;
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xxhasher(xxhasher const&) = delete;
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xxhasher&
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operator=(xxhasher const&) = delete;
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xxhasher()
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{
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state_ = allocState();
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XXH3_64bits_reset(state_);
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}
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~xxhasher() noexcept
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{
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XXH3_freeState(state_);
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}
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template <
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class Seed,
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std::enable_if_t<std::is_unsigned<Seed>::value>* = nullptr>
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explicit xxhasher(Seed seed)
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{
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state_ = allocState();
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XXH3_64bits_reset_withSeed(state_, seed);
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}
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template <
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class Seed,
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std::enable_if_t<std::is_unsigned<Seed>::value>* = nullptr>
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xxhasher(Seed seed, Seed)
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{
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state_ = allocState();
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XXH3_64bits_reset_withSeed(state_, seed);
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}
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void
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operator()(void const* key, std::size_t len) noexcept
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{
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XXH3_64bits_update(state_, key, len);
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}
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explicit
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operator std::size_t() noexcept
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{
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return XXH3_64bits_digest(state_);
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}
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};
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} // namespace beast
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#endif
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