38 lines
1.0 KiB
C++
Executable File
38 lines
1.0 KiB
C++
Executable File
// Copyright 2015, Tobias Hermann and the FunctionalPlus contributors.
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// https://github.com/Dobiasd/FunctionalPlus
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#pragma once
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#include <tuple>
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#include <type_traits>
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#include <utility>
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#include <fplus/internal/invoke.hpp>
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namespace fplus
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{
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namespace internal
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{
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// C++17 std::apply (http://en.cppreference.com/w/cpp/utility/apply)
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template <typename F, typename Tuple, std::size_t... I>
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constexpr decltype(auto) apply_impl(F&& f, Tuple&& t, std::index_sequence<I...>)
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{
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return internal::invoke(std::forward<F>(f),
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std::get<I>(std::forward<Tuple>(t))...);
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}
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template <typename F, typename Tuple>
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constexpr decltype(auto) apply(F&& f, Tuple&& t)
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{
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return internal::apply_impl(
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std::forward<F>(f),
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std::forward<Tuple>(t),
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std::make_index_sequence<
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std::tuple_size<std::decay_t<Tuple>>::value>{});
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}
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}
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}
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