common_reference.hpp

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// SPDX-License-Identifier: BSL-1.0
 
#ifndef TETL_TYPE_TRAITS_COMMON_REFERENCE_HPP
#define TETL_TYPE_TRAITS_COMMON_REFERENCE_HPP
 
#include <etl/_type_traits/basic_common_reference.hpp>
#include <etl/_type_traits/integral_constant.hpp>
#include <etl/_type_traits/is_same.hpp>
 
namespace etl {

template <typename... T>
struct common_reference;
 
// if sizeof...(T) is zero
template <>
struct common_reference<> { };
 
// if sizeof...(T) is one
template <typename T>
struct common_reference<T> {
    using type = T;
};

template <typename T, typename U>
    requires is_same_v<T, U>
struct common_reference<T, U> {
    using type = T;
};
 
template <typename... T>
using common_reference_t = typename common_reference<T...>::type;
 
} // namespace etl
 
#endif // TETL_TYPE_TRAITS_COMMON_REFERENCE_HPP