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[lttng-tools.git] / src / common / type-traits.hpp

diff --git a/src/common/type-traits.hpp b/src/common/type-traits.hpp
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+++ b/src/common/type-traits.hpp
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+/*
+ * Copyright (c) 2023 Philippe Proulx <pproulx@efficios.com>
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#ifndef LTTNG_TYPE_TRAITS_HPP
+#define LTTNG_TYPE_TRAITS_HPP
+
+#include <type_traits>
+
+namespace lttng {
+namespace traits {
+
+/*
+ * Provides the member constant `value` equal to:
+ *
+ * `T` is in the list of types `Ts`:
+ *     `true`
+ *
+ * Otherwise:
+ *     `false`
+ */
+template <typename T, typename... Ts>
+struct is_one_of : std::false_type {
+};
+
+template <typename T, typename... Ts>
+struct is_one_of<T, T, Ts...> : std::true_type {
+};
+
+template <typename T, typename U, typename... Ts>
+struct is_one_of<T, U, Ts...> : is_one_of<T, Ts...> {
+};
+} /* namespace traits */
+} /* namespace lttng */
+
+#endif /* LTTNG_TYPE_TRAITS_HPP */