整理

include/boost/atomic/detail/once_flag.hpp

@@ -0,0 +1,43 @@
+/*
+ * 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) 2020-2025 Andrey Semashev
+ */
+/*!
+ * \file   atomic/detail/once_flag.hpp
+ *
+ * This header declares \c once_flag structure for controlling one time initialization
+ */
+
+#ifndef BOOST_ATOMIC_DETAIL_ONCE_FLAG_HPP_INCLUDED_
+#define BOOST_ATOMIC_DETAIL_ONCE_FLAG_HPP_INCLUDED_
+
+#include <boost/atomic/detail/config.hpp>
+#include <boost/atomic/detail/aligned_variable.hpp>
+#include <boost/atomic/detail/core_operations.hpp>
+#include <boost/atomic/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+namespace atomics {
+namespace detail {
+
+using once_flag_operations = atomics::detail::core_operations< 1u, false, false >;
+
+struct once_flag
+{
+    BOOST_ATOMIC_DETAIL_ALIGNED_VAR(once_flag_operations::storage_alignment, once_flag_operations::storage_type, m_flag);
+};
+
+} // namespace detail
+} // namespace atomics
+} // namespace boost
+
+#include <boost/atomic/detail/footer.hpp>
+
+#endif // BOOST_ATOMIC_DETAIL_ONCE_FLAG_HPP_INCLUDED_