整理

include/boost/atomic/wait_result.hpp

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+/*
+ * 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/wait_result.hpp
+ *
+ * This header contains definition of the \c wait_result class template.
+ */
+
+#ifndef BOOST_ATOMIC_WAIT_RESULT_HPP_INCLUDED_
+#define BOOST_ATOMIC_WAIT_RESULT_HPP_INCLUDED_
+
+#include <type_traits>
+#include <boost/atomic/detail/config.hpp>
+#include <boost/atomic/detail/header.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+namespace boost {
+namespace atomics {
+
+//! The structure contains the result of a timed waiting operation
+template< typename T >
+struct wait_result
+{
+    //! Last value read as part of the waiting operation
+    T value;
+    //! Indicates whether the waiting operation has ended due to timeout
+    bool timeout;
+
+    constexpr wait_result() noexcept(std::is_nothrow_default_constructible< T >::value) :
+        value(),
+        timeout(false)
+    {
+    }
+
+    template< typename U, typename = typename std::enable_if< std::is_constructible< T, U&& >::value >::type >
+    constexpr wait_result(U&& val, bool tout) noexcept(std::is_nothrow_constructible< T, U&& >::value) :
+        value(static_cast< U&& >(val)),
+        timeout(tout)
+    {
+    }
+};
+
+} // namespace atomics
+} // namespace boost
+
+#include <boost/atomic/detail/footer.hpp>
+
+#endif // BOOST_ATOMIC_WAIT_RESULT_HPP_INCLUDED_