整理

include/boost/atomic/detail/has_posix_clock_traits.hpp

@@ -0,0 +1,51 @@
+/*
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * Copyright (c) 2025 Andrey Semashev
+ */
+/*!
+ * \file   atomic/has_posix_clock_traits.hpp
+ *
+ * This header contains utilities for working with \c posix_clock_traits.
+ */
+
+#ifndef BOOST_ATOMIC_DETAIL_HAS_POSIX_CLOCK_TRAITS_HPP_INCLUDED_
+#define BOOST_ATOMIC_DETAIL_HAS_POSIX_CLOCK_TRAITS_HPP_INCLUDED_
+
+#include <sys/types.h> // clockid_t
+#include <type_traits>
+#include <boost/atomic/posix_clock_traits_fwd.hpp>
+#include <boost/atomic/detail/config.hpp>
+#include <boost/atomic/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+namespace atomics {
+namespace detail {
+
+template< typename Clock >
+struct has_posix_clock_traits_impl
+{
+    template< typename T, clockid_t = posix_clock_traits< T >::clock_id >
+    static std::true_type check_posix_clock_traits_clock_id(T*);
+    static std::false_type check_posix_clock_traits_clock_id(...);
+
+    using type = decltype(has_posix_clock_traits_impl< Clock >::check_posix_clock_traits_clock_id(static_cast< Clock* >(nullptr)));
+};
+
+//! Checks if there exists a specialization of \c posix_clock_traits for \c Clock
+template< typename Clock >
+using has_posix_clock_traits = typename has_posix_clock_traits_impl< Clock >::type;
+
+} // namespace detail
+} // namespace atomics
+} // namespace boost
+
+#include <boost/atomic/detail/footer.hpp>
+
+#endif // BOOST_ATOMIC_DETAIL_HAS_POSIX_CLOCK_TRAITS_HPP_INCLUDED_