comparison DEPENDENCIES/generic/include/boost/log/detail/thread_specific.hpp @ 16:2665513ce2d3

Add boost headers

+/*
+ *          Copyright Andrey Semashev 2007 - 2013.
+ * 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)
+ */
+/*!
+ * \file   thread_specific.hpp
+ * \author Andrey Semashev
+ * \date   01.03.2008
+ *
+ * \brief  This header is the Boost.Log library implementation, see the library documentation
+ *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
+ */
+
+#ifndef BOOST_LOG_DETAIL_THREAD_SPECIFIC_HPP_INCLUDED_
+#define BOOST_LOG_DETAIL_THREAD_SPECIFIC_HPP_INCLUDED_
+
+#include <boost/static_assert.hpp>
+#include <boost/type_traits/is_pod.hpp>
+#include <boost/log/detail/config.hpp>
+
+#ifdef BOOST_HAS_PRAGMA_ONCE
+#pragma once
+#endif
+
+#if !defined(BOOST_LOG_NO_THREADS)
+
+#include <boost/log/detail/header.hpp>
+
+namespace boost {
+
+BOOST_LOG_OPEN_NAMESPACE
+
+namespace aux {
+
+//! Base class for TLS to hide platform-specific storage management
+class thread_specific_base
+{
+private:
+    union key_storage
+    {
+        void* as_pointer;
+        unsigned int as_dword;
+    };
+
+    key_storage m_Key;
+
+protected:
+    BOOST_LOG_API thread_specific_base();
+    BOOST_LOG_API ~thread_specific_base();
+    BOOST_LOG_API void* get_content() const;
+    BOOST_LOG_API void set_content(void* value) const;
+
+    //  Copying prohibited
+    BOOST_DELETED_FUNCTION(thread_specific_base(thread_specific_base const&))
+    BOOST_DELETED_FUNCTION(thread_specific_base& operator= (thread_specific_base const&))
+};
+
+//! A TLS wrapper for small POD types with least possible overhead
+template< typename T >
+class thread_specific :
+    public thread_specific_base
+{
+    BOOST_STATIC_ASSERT_MSG(sizeof(T) <= sizeof(void*) && is_pod< T >::value, "Boost.Log: Thread-specific values must be PODs and must not exceed the size of a pointer");
+
+    //! Union to perform type casting
+    union value_storage
+    {
+        void* as_pointer;
+        T as_value;
+    };
+
+public:
+    //! Default constructor
+    BOOST_DEFAULTED_FUNCTION(thread_specific(), {})
+    //! Initializing constructor
+    thread_specific(T const& value)
+    {
+        set(value);
+    }
+    //! Assignment
+    thread_specific& operator= (T const& value)
+    {
+        set(value);
+        return *this;
+    }
+
+    //! Accessor
+    T get() const
+    {
+        value_storage cast = {};
+        cast.as_pointer = thread_specific_base::get_content();
+        return cast.as_value;
+    }
+
+    //! Setter
+    void set(T const& value)
+    {
+        value_storage cast = {};
+        cast.as_value = value;
+        thread_specific_base::set_content(cast.as_pointer);
+    }
+};
+
+} // namespace aux
+
+BOOST_LOG_CLOSE_NAMESPACE // namespace log
+
+} // namespace boost
+
+#include <boost/log/detail/footer.hpp>
+
+#endif // !defined(BOOST_LOG_NO_THREADS)
+
+#endif // BOOST_LOG_DETAIL_THREAD_SPECIFIC_HPP_INCLUDED_