src/common/type-traits.hpp

   1 /*
   2  * Copyright (c) 2023 Philippe Proulx <pproulx@efficios.com>
   3  *
   4  * SPDX-License-Identifier: MIT
   5  */
   6
   7 #ifndef LTTNG_TYPE_TRAITS_HPP
   8 #define LTTNG_TYPE_TRAITS_HPP
   9
  10 #include <type_traits>
  11
  12 namespace lttng {
  13 namespace traits {
  14
  15 /*
  16  * Provides the member constant `value` equal to:
  17  *
  18  * `T` is in the list of types `Ts`:
  19  *     `true`
  20  *
  21  * Otherwise:
  22  *     `false`
  23  */
  24 template <typename T, typename... Ts>
  25 struct is_one_of : std::false_type {
  26 };
  27
  28 template <typename T, typename... Ts>
  29 struct is_one_of<T, T, Ts...> : std::true_type {
  30 };
  31
  32 template <typename T, typename U, typename... Ts>
  33 struct is_one_of<T, U, Ts...> : is_one_of<T, Ts...> {
  34 };
  35 } /* namespace traits */
  36 } /* namespace lttng */
  37
  38 #endif /* LTTNG_TYPE_TRAITS_HPP */