2020-01-14 21:53:36 +01:00
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/*
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* Copyright 2020 Max Kellermann <max.kellermann@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* 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)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef GENERATE_ARRAY_HXX
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#define GENERATE_ARRAY_HXX
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#include <array>
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#include <utility>
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template<std::size_t N, typename F, std::size_t... I>
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constexpr auto
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_GenerateArray(F &&f, std::index_sequence<I...>) noexcept
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{
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using T = decltype(f(0));
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2020-01-14 23:16:46 +01:00
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/* double curly braces for compatibility with older compilers
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which are not 100% C++17 compliant (e.g. Apple xcode
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9.4) */
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return std::array<T, N>{{f(I)...}};
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2020-01-14 21:53:36 +01:00
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}
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/**
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* Generate a `constexpr` std::array at compile time by calling the
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* given function for each index.
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*
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* @param N the number of elements in the array
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* @param F the function (called N times with the index as only parameter)
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*/
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template<std::size_t N, typename F>
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constexpr auto
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GenerateArray(F &&f) noexcept
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{
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return _GenerateArray<N>(std::forward<F>(f),
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std::make_index_sequence<N>());
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}
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#endif
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