conditional.hpp

Go to the documentation of this file.

// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2019 Tobias Hienzsch
 
#ifndef TETL_TYPE_TRAITS_CONDITIONAL_HPP
#define TETL_TYPE_TRAITS_CONDITIONAL_HPP
 
namespace etl {
 
/// \brief Provides member typedef type, which is defined as T if B is true at
/// compile time, or as F if B is false.
/// \ingroup type_traits
template <bool B, typename T, typename F>
struct conditional {
    using type = T;
};
 
template <typename T, typename F>
struct conditional<false, T, F> {
    using type = F;
};
 
/// \ingroup type_traits
/// \relates conditional
template <bool B, typename T, typename F>
using conditional_t = typename conditional<B, T, F>::type;
 
} // namespace etl
 
#endif // TETL_TYPE_TRAITS_CONDITIONAL_HPP