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35 lines
829 B
C++
35 lines
829 B
C++
#ifndef OPENMW_COMPONENTS_MISC_META_H
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#define OPENMW_COMPONENTS_MISC_META_H
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#include <cstddef>
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#include <tuple>
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#include <type_traits>
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namespace Misc
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{
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template <class T, class Tuple>
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struct TupleHasType;
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template <class T, class... Args>
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struct TupleHasType<T, std::tuple<Args...>>
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{
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static constexpr bool value = (std::is_same_v<T, Args> || ...);
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};
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template <class T, class Tuple>
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struct TupleTypeIndex;
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template <class T, class... Types>
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struct TupleTypeIndex<T, std::tuple<T, Types...>>
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{
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static constexpr std::size_t value = 0;
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};
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template <class T, class U, class... Types>
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struct TupleTypeIndex<T, std::tuple<U, Types...>>
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{
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static constexpr std::size_t value = 1 + TupleTypeIndex<T, std::tuple<Types...>>::value;
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};
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}
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#endif
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