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2ab7cfbf30
* is_contiguous_hashable trait identifies optimizable types * hash_append() function overloads for basic types: - scalars, floats - array, C array - pair, tuple - boost array and tuple (if configured) * Provided Spooky hash wrapper for use with hash_append * Use hash_append in hardened_hash and other places * New Utility meta functions for working with variadics: - static_and - static_sum * Added type_name utility function for diagnostics * hash_metrics suite of functions to evalulate hash functions * Test suites to measure hash function performance * Various fixes
66 lines
1.9 KiB
C++
66 lines
1.9 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, Howard Hinnant <howard.hinnant@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_UTILITY_META_H_INCLUDED
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#define BEAST_UTILITY_META_H_INCLUDED
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#include <type_traits>
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namespace beast {
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template <bool ...> struct static_and;
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template <bool b0, bool ... bN>
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struct static_and <b0, bN...>
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: public std::integral_constant <
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bool, b0 && static_and<bN...>::value>
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{
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};
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template <>
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struct static_and<>
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: public std::true_type
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{
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};
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static_assert( static_and<true, true, true>::value, "");
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static_assert(!static_and<true, false, true>::value, "");
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template <std::size_t ...>
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struct static_sum;
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template <std::size_t s0, std::size_t ...sN>
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struct static_sum <s0, sN...>
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: public std::integral_constant <
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std::size_t, s0 + static_sum<sN...>::value>
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{
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};
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template <>
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struct static_sum<>
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: public std::integral_constant<std::size_t, 0>
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{
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};
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static_assert(static_sum<5, 2, 17, 0>::value == 24, "");
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} // beast
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#endif // BEAST_UTILITY_META_H_INCLUDED
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