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Generated: 18 Jul 2008

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# IInterface.h

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    00001 // $Id: IInterface.h,v 1.14 2008/01/29 08:28:14 marcocle Exp $
    00002 #ifndef GAUDIKERNEL_IINTERFACE_H
    00003 #define GAUDIKERNEL_IINTERFACE_H
    00004
    00005 // Include files
    00006
    00007 #include "GaudiKernel/Kernel.h"
    00008 #include "GaudiKernel/StatusCode.h"
    00009 #include <ostream>
    00010
    00022 class InterfaceID {
    00023 public:
    00025   InterfaceID( unsigned long lid ) : m_id( lid & 0xFFFF ),
    00026                                      m_major_ver( (lid & 0xFF000000)>>24 ),
    00027                                      m_minor_ver( (lid & 0xFF0000)>> 16 ) { }
    00029   InterfaceID( unsigned long id, unsigned long major, unsigned long minor = 0)
    00030     : m_id( id ), m_major_ver( major ), m_minor_ver( minor ) { }
    00032   InterfaceID( const char* name, unsigned long major, unsigned long minor = 0)
    00033     : m_id( hash32(name) ), m_major_ver( major ), m_minor_ver( minor ) { }
    00035   ~InterfaceID() { }
    00037   operator unsigned long() const {
    00038     return (m_major_ver << 24) + (m_minor_ver << 16) + m_id;
    00039   }
    00041   unsigned long id() const { return m_id; }
    00043   unsigned long majorVersion() const { return m_major_ver; }
    00045   unsigned long minorVersion() const { return m_minor_ver; }
    00049   bool versionMatch( const InterfaceID& iid ) const {
    00050     return ( id() == iid.id() &&
    00051              majorVersion() == iid.majorVersion() &&
    00052              minorVersion() >= iid.minorVersion() );
    00053   }
    00055   bool fullMatch( const InterfaceID& iid ) const {
    00056     return ( id() == iid.id() &&
    00057              majorVersion() == iid.majorVersion() &&
    00058              minorVersion() == iid.minorVersion() );
    00059   }
    00061   bool operator == (const InterfaceID& iid ) const { return fullMatch(iid); }
    00063   unsigned int hash32(const char* key) {
    00064     unsigned int hash;
    00065     const char* k;
    00066     for (hash = 0, k = key; *k; k++) {
    00067       hash += *k; hash += (hash << 10); hash ^= (hash >> 6);
    00068     }
    00069     hash += (hash << 3); hash ^= (hash >> 11); hash += (hash << 15);
    00070     return hash;
    00071   }
    00072 private:
    00073   friend std::ostream& operator << ( std::ostream&, const InterfaceID&);
    00074   unsigned long m_id;
    00075   unsigned long m_major_ver;
    00076   unsigned long m_minor_ver;
    00077 };
    00078
    00080 // typedef InterfaceID IID; removed: it collides with windows system typename
    00081
    00082 // Interface ID
    00083 static const InterfaceID IID_IInterface(1,0,0);
    00084
    00091 class IInterface        {
    00092   public:
    00094   static const InterfaceID& interfaceID() { return IID_IInterface; }
    00095
    00097   virtual ~IInterface() { }
    00098
    00103   virtual StatusCode queryInterface(const InterfaceID& riid,
    00104                                     void** ppvInterface) = 0;
    00105
    00107   virtual unsigned long addRef() = 0;
    00108
    00110   virtual unsigned long release() = 0;
    00111
    00113   enum Status   {
    00115     SUCCESS = 1,
    00117     NO_INTERFACE,
    00119     VERSMISMATCH,
    00121     LAST_ERROR
    00122   };
    00123 };
    00124
    00132 template <class I>
    00133 bool isValidInterface( I* i) {
    00134   void* ii;
    00135   StatusCode sc =  i->queryInterface( I::interfaceID(), &ii);
    00136   return sc.isSuccess();
    00137 }
    00138
    00140 inline std::ostream& operator << ( std::ostream& s, const InterfaceID& id) {
    00141     s << "IID_" << id.m_id;
    00142     return s;
    00143 }
    00144
    00155 template <class DEST,class SRC>
    00156 inline DEST** pp_cast(SRC** ptr){
    00157   return reinterpret_cast<DEST**>(ptr);
    00158 }
    00159 #endif  // GAUDIKERNEL_IINTERFACE_H