af011aaba1
for better readability than the recursive approach. Signed-off-by: Kefu Chai <tchaikov@gmail.com> Closes #12091
29 lines
675 B
C++
29 lines
675 B
C++
/*
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* Copyright (C) 2021-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <variant>
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#include <type_traits>
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namespace utils {
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// Given type T and an std::variant Variant, return std::true_type if T is a variant element
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template <class T, class Variant>
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struct is_variant_element;
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template <class T, class... Elements>
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struct is_variant_element<T, std::variant<Elements...>> : std::bool_constant<(std::is_same_v<T, Elements> || ...)> {
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};
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// Givent type T and std::variant, true if T is one of the variant elements.
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template <typename T, typename Variant>
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concept VariantElement = is_variant_element<T, Variant>::value;
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}
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