整理

include/boost/smart_ptr/detail/sp_counted_base_nt.hpp

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+#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED
+#define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED
+
+// MS compatible compilers support #pragma once
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+//
+//  detail/sp_counted_base_nt.hpp
+//
+//  Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd.
+//  Copyright 2004-2005 Peter Dimov
+//
+// 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)
+//
+
+#include <boost/smart_ptr/detail/sp_typeinfo_.hpp>
+#include <boost/config.hpp>
+#include <cstdint>
+
+#if defined(BOOST_SP_REPORT_IMPLEMENTATION)
+
+#include <boost/config/pragma_message.hpp>
+BOOST_PRAGMA_MESSAGE("Using single-threaded, non-atomic sp_counted_base")
+
+#endif
+
+namespace boost
+{
+
+namespace detail
+{
+
+class BOOST_SYMBOL_VISIBLE sp_counted_base
+{
+private:
+
+    sp_counted_base( sp_counted_base const & );
+    sp_counted_base & operator= ( sp_counted_base const & );
+
+    std::int_least32_t use_count_;        // #shared
+    std::int_least32_t weak_count_;       // #weak + (#shared != 0)
+
+public:
+
+    sp_counted_base() noexcept: use_count_( 1 ), weak_count_( 1 )
+    {
+    }
+
+    virtual ~sp_counted_base() /*noexcept*/
+    {
+    }
+
+    // dispose() is called when use_count_ drops to zero, to release
+    // the resources managed by *this.
+
+    virtual void dispose() noexcept = 0; // nothrow
+
+    // destroy() is called when weak_count_ drops to zero.
+
+    virtual void destroy() noexcept // nothrow
+    {
+        delete this;
+    }
+
+    virtual void * get_deleter( sp_typeinfo_ const & ti ) noexcept = 0;
+    virtual void * get_local_deleter( sp_typeinfo_ const & ti ) noexcept = 0;
+    virtual void * get_untyped_deleter() noexcept = 0;
+
+    void add_ref_copy() noexcept
+    {
+        ++use_count_;
+    }
+
+    bool add_ref_lock() noexcept // true on success
+    {
+        if( use_count_ == 0 ) return false;
+        ++use_count_;
+        return true;
+    }
+
+    void release() noexcept
+    {
+        if( --use_count_ == 0 )
+        {
+            dispose();
+            weak_release();
+        }
+    }
+
+    void weak_add_ref() noexcept
+    {
+        ++weak_count_;
+    }
+
+    void weak_release() noexcept
+    {
+        if( --weak_count_ == 0 )
+        {
+            destroy();
+        }
+    }
+
+    long use_count() const noexcept
+    {
+        return use_count_;
+    }
+};
+
+} // namespace detail
+
+} // namespace boost
+
+#endif  // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED