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# src/Common/IpTaggedObject.hpp

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    00001 // Copyright (C) 2004, 2006 International Business Machines and others.
    00002 // All Rights Reserved.
    00003 // This code is published under the Eclipse Public License.
    00004 //
    00005 // $Id: IpTaggedObject.hpp 2491 2014-05-31 11:17:49Z stefan $
    00006 //
    00007 // Authors:  Carl Laird, Andreas Waechter     IBM    2004-08-13
    00008
    00009 #ifndef __IPTAGGEDOBJECT_HPP__
    00010 #define __IPTAGGEDOBJECT_HPP__
    00011
    00012 #include "IpUtils.hpp"
    00013 #include "IpDebug.hpp"
    00014 #include "IpReferenced.hpp"
    00015 #include "IpObserver.hpp"
    00016 #include <limits>
    00017
    00018 /* keyword to declare a thread-local variable according to http://en.wikipedia.org/wiki/Thread-local_storage
    00019  * GCC < 4.5 on MacOS X does not support TLS
    00020  */
    00021 #ifndef IPOPT_THREAD_LOCAL
    00022
    00023 #if defined(_MSC_VER)
    00024 #define IPOPT_THREAD_LOCAL __declspec(thread)
    00025 #elif defined(__APPLE__) && defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 405)
    00026 #define IPOPT_THREAD_LOCAL
    00027 #else
    00028 #define IPOPT_THREAD_LOCAL __thread
    00029 #endif
    00030
    00031 #endif
    00032
    00033 namespace Ipopt
    00034 {
    00035
    00075   class TaggedObject : public ReferencedObject, public Subject
    00076   {
    00077   public:
    00079     typedef unsigned int Tag;
    00080
    00082     TaggedObject()
    00083         :
    00084         Subject()
    00085     {
    00086       ObjectChanged();
    00087     }
    00088
    00090     virtual ~TaggedObject()
    00091     {}
    00092
    00097     Tag GetTag() const
    00098     {
    00099       return tag_;
    00100     }
    00101
    00107     bool HasChanged(const Tag comparison_tag) const
    00108     {
    00109       return (comparison_tag == tag_) ? false : true;
    00110     }
    00111   protected:
    00116     void ObjectChanged()
    00117     {
    00118       DBG_START_METH("TaggedObject::ObjectChanged()", 0);
    00119       tag_ = unique_tag_;
    00120       unique_tag_++;
    00121       DBG_ASSERT(unique_tag_ < std::numeric_limits<Tag>::max());
    00122       // The Notify method from the Subject base class notifies all
    00123       // registered Observers that this subject has changed.
    00124       Notify(Observer::NT_Changed);
    00125     }
    00126   private:
    00134     TaggedObject(const TaggedObject&);
    00135
    00137     void operator=(const TaggedObject&);
    00139
    00144     static IPOPT_THREAD_LOCAL Tag unique_tag_;
    00145
    00151     Tag tag_;
    00152
    00158     Index cache_priority_;
    00159   };
    00160 } // namespace Ipopt
    00161 #endif

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