variant_size.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2021 Tobias Hienzsch
 
#ifndef TETL_VARIANT_VARIANT_SIZE_HPP
#define TETL_VARIANT_VARIANT_SIZE_HPP
 
#include <etl/_cstddef/size_t.hpp>
#include <etl/_type_traits/integral_constant.hpp>
#include <etl/_variant/variant_fwd.hpp>
 
namespace etl {
 
template <typename... Ts>
struct variant_size<variant<Ts...>> : integral_constant<etl::size_t, sizeof...(Ts)> { };
 
template <typename T>
struct variant_size<T const> : variant_size<T>::type { };
 
template <typename T>
struct variant_size<T volatile> : variant_size<T>::type { };
 
template <typename T>
struct variant_size<T const volatile> : variant_size<T>::type { };
 
template <typename T>
inline constexpr auto variant_size_v = variant_size<T>::value;
 
} // namespace etl
 
#endif // TETL_VARIANT_VARIANT_SIZE_HPP