mirror of
https://github.com/bolero-MURAKAMI/Sprout
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53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2017 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef SPROUT_DETAIL_PARAM_AT_HPP
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#define SPROUT_DETAIL_PARAM_AT_HPP
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#include <type_traits>
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#include <sprout/config.hpp>
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#include <sprout/workaround/std/cstddef.hpp>
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namespace sprout {
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namespace detail {
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template<typename R, typename T, typename... Values>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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sizeof...(Values) == 0,
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R
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>::type
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param_at(std::size_t, T const& v, Values const&...) {
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return v;
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}
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template<typename R, typename T, typename... Values>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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sizeof...(Values) != 0,
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R
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>::type
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param_at(std::size_t n, T const& v, Values const&... values) {
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return n == 0 ? v : sprout::detail::param_at<R>(n - 1, values...);
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}
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template<typename R, typename T, typename... Values>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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sizeof...(Values) == 0,
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R
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>::type
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param_seq_at(std::size_t, std::size_t m, T const& v, Values const&...) {
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return v[m];
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}
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template<typename R, typename T, typename... Values>
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inline SPROUT_CONSTEXPR typename std::enable_if<
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sizeof...(Values) != 0,
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R
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>::type
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param_seq_at(std::size_t n, std::size_t m, T const& v, Values const&... values) {
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return n == 0 ? v[m] : sprout::detail::param_seq_at<R>(n - 1, m, values...);
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}
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} // namespace detail
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} // namespace sprout
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#endif // #ifndef SPROUT_DETAIL_PARAM_AT_HPP
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