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https://github.com/bolero-MURAKAMI/Sprout.git
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38 lines
881 B
C++
38 lines
881 B
C++
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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 <cstddef>
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#include <type_traits>
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#include <sprout/config.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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SPROUT_CONSTEXPR inline typename std::enable_if<
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sizeof...(Values) == 0,
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R
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>::type param_at(
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std::size_t n,
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T const& v,
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Values const&... values
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)
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{
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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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SPROUT_CONSTEXPR inline typename std::enable_if<
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sizeof...(Values) != 0,
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R
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>::type param_at(
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std::size_t n,
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T const& v,
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Values const&... values
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)
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{
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return n == 0 ? v : sprout::detail::param_at<R>(n - 1, 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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