    // @(#)root/base:$Name:  $:$Id: TQObject.cxx,v 1.44 2005/06/22 20:18:10 brun Exp $
    // Author: Valeriy Onuchin & Fons Rademakers   15/10/2000

    /*************************************************************************
     * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
     * All rights reserved.                                                  *
     *                                                                       *
     * For the licensing terms see $ROOTSYS/LICENSE.                         *
     * For the list of contributors see $ROOTSYS/README/CREDITS.             *
     *************************************************************************/

    //////////////////////////////////////////////////////////////////////////
    //                                                                      //
    // This is the ROOT implementation of the Qt object communication       //
    // mechanism (see also http://www.troll.no/qt/metaobjects.html)         //
    //                                                                      //
    // Signals and slots are used for communication between objects.        //
    // When an object has changed in some way that might be interesting     //
    // for the outside world, it emits a signal to tell whoever is          //
    // listening. All slots that are connected to this signal will be       //
    // activated (called). It is even possible to connect a signal          //
    // directly to another signal (this will emit the second signal         //
    // immediately whenever the first is emitted.) There is no limitation   //
    // on the number of slots that can be connected to a signal.            //
    // The slots will be activated in the order they were connected         //
    // to the signal. This mechanism allows objects to be easily reused,    //
    // because the object that emits a signal does not need to know         //
    // to which objects the signals are connected.                          //
    // Together, signals and slots make up a powerfull component            //
    // programming mechanism.                                               //
    //                                                                      //
    // This implementation is provided by                                   //
    // Valeriy Onuchin (onuchin@sirius.ihep.su).                            //
    //                                                                      //
    //////////////////////////////////////////////////////////////////////////

    //***************************** Signals *****************************
    //___________________________________________________________________
    //
    //             Destroyed()
    //
    // Signal emitted when object is destroyed.
    // This signal could be connected to some garbage-collector object.
    //
    //___________________________________________________________________
    //
    //             ChangedBy(const char *method_name)
    //
    // This signal is emitted when some important data members of
    // the object were changed. method_name parameter can be used
    // as an identifier of the modifier method.
    //
    //___________________________________________________________________
    //
    //             Message(const char *msg)
    //
    // General purpose message signal
    //
    /////////////////////////////////////////////////////////////////////

    #include "TQObject.h"
    #include "TQConnection.h"
    #include "TROOT.h"
    #include "TSystem.h"
    #include "TMethod.h"
    #include "TBaseClass.h"
    #include "TDataType.h"
    #include "TInterpreter.h"
    #include "TClass.h"
    #include "TError.h"
    #include "G__ci.h"
    #include "Api.h"
    #include "Riostream.h"
    #include "RQ_OBJECT.h"
    #include "TVirtualMutex.h"
    #include "Varargs.h"
    #include "TCint.h"

    #ifdef HAVE_CONFIG
    #include "config.h"
    #endif

    void *gTQSender; // A pointer to the object that sent the last signal.
                     // Getting access to the sender might be practical
                     // when many signals are connected to a single slot.

    ClassImpQ(TQObject)
    ClassImpQ(TQObjSender)
    ClassImpQ(TQClass)

    /////////////////// internal use static functions ///////////////////
    //______________________________________________________________________________
    static char *ResolveTypes(const char *method)
    {
       // Resolve any typedefs in the method signature. For example:
       // func(Float_t,Int_t) becomes func(float,int).
       // The returned string must be deleted by the user.

       if (!method || !*method) return 0;

       char *str = new char[strlen(method)+1];
       if (str) strcpy(str, method);

       TString res;

       char *s = strtok(str, "(");
       res = s;
       res += "(";

       Bool_t first = kTRUE;
       while ((s = strtok(0, ",)"))) {
          char *s1, s2 = 0;
          if ((s1 = strchr(s, '*'))) {
             *s1 = 0;
             s2  = '*';
          }
          if (!s1 && (s1 = strchr(s, '&'))) {
             *s1 = 0;
             s2  = '&';
          }
          TDataType *dt = gROOT->GetType(s);
          if (s1) *s1 = s2;
          if (!first) res += ",";
          if (dt) {
             res += dt->GetFullTypeName();
             if (s1) res += s1;
          } else
             res += s;
          first = kFALSE;
       }

       res += ")";

       delete [] str;
       str = new char[res.Length()+1];
       strcpy(str, res.Data());

       return str;
    }

    //______________________________________________________________________________
    static char *CompressName(const char *method_name)
    {
       // Removes "const" words and blanks from full (with prototype)
       // method name.
       //
       //  Example: CompressName(" Draw(const char *, const char *,
       //                               Option_t * , Int_t , Int_t)")
       //
       // Returns the string "Draw(char*,char*,char*,int,int)"
       // The returned string must be deleted by the user.

       if (!method_name || !*method_name) return 0;

       char *str = new char[strlen(method_name)+1];
       if (str) strcpy(str, method_name);

       char *tmp = str;

       // substitute "const" with white spaces
       while ((tmp = strstr(tmp,"const"))) {
          for (int i = 0; i < 5; i++) *(tmp+i) = ' ';
       }

       tmp = str;
       char *s;
       s = str;

       Bool_t quote = kFALSE;
       while (*tmp) {
          if (*tmp == '\"')
             quote = quote ? kFALSE : kTRUE;
          if (*tmp != ' ' || quote)
             *s++ = *tmp;
          tmp++;
       }
       *s = '\0';

       s = ResolveTypes(str);

       delete [] str;

       return s;
    }

    //______________________________________________________________________________
    static TMethod *GetMethodWithPrototype(TClass *cl, const char *method,
                                           const char *proto, Int_t &nargs)
    {
       // Almost the same as TClass::GetMethodWithPrototype().

       nargs = 0;

       if (!gInterpreter) return 0;
       R__LOCKGUARD2(gCINTMutex);

       Long_t faddr = 0;
       if (!cl->IsLoaded()) {
          // interpreted class
          G__MethodInfo meth;
          long offset;
          if (cl->GetClassInfo())
             meth = cl->GetClassInfo()->GetMethod(method, proto, &offset);
          if (meth.IsValid()) {
             nargs = meth.NArg();
             return (TMethod *) -1;
          }
          return 0;
       } else {
          faddr = (Long_t)gInterpreter->GetInterfaceMethodWithPrototype(cl, method,
                                                                        proto);
          if (!faddr) return 0;
       }

       TMethod *m;
       TIter next_method(cl->GetListOfMethods());

       // Look for a method in this class
       while ((m = (TMethod *) next_method())) {
          if (faddr == (Long_t)m->InterfaceMethod()) {
             nargs = m->GetNargs();
             return m;
          }
       }

       TIter next_base(cl->GetListOfBases());
       TBaseClass *base;

       // loop over all base classes
       while ((base = (TBaseClass *)next_base())) {
          TClass *c;
          if ((c = base->GetClassPointer())) {
             if ((m = GetMethodWithPrototype(c, method, proto, nargs))) return m;
          }
       }
       return 0;
    }

    //______________________________________________________________________________
    static TMethod *GetMethod(TClass *cl, const char *method, const char *params)
    {
       // Almost the same as TClass::GetMethod().

       if (!gInterpreter) return 0;
       R__LOCKGUARD2(gCINTMutex);

       Long_t faddr = 0;
       if (!cl->IsLoaded()) {
          // interpreted class
          G__CallFunc  func;
          long         offset;
          func.SetFunc(cl->GetClassInfo(), method, params, &offset);
          if (func.IsValid())
             return (TMethod *) -1;
          return 0;
       } else {
          faddr = (Long_t)gInterpreter->GetInterfaceMethod(cl, method, params);
          if (!faddr) return 0;
       }

       TMethod *m;
       TIter next_method(cl->GetListOfMethods());

       // Look for a method in this class
       while ((m = (TMethod *) next_method())) {
          if (faddr == (Long_t)m->InterfaceMethod()) return m;
       }

       TIter next_base(cl->GetListOfBases());
       TBaseClass *base;

       // loop over all base classes
       while ((base = (TBaseClass *)next_base())) {
          TClass *c;
          if ((c = base->GetClassPointer())) {
             if ((m = GetMethod(c,method,params))) return m;
          }
       }
       return 0;
    }

    //______________________________________________________________________________
     Int_t TQObject::CheckConnectArgs(TQObject *sender,
                                     TClass *sender_class, const char *signal,
                                     TClass *receiver_class, const char *slot)
    {
       // Checking of consitency of sender/receiver methods/arguments.
       // Returns -1 on error, otherwise number or arguments of signal function.
       // Static method.

       char *signal_method = new char[strlen(signal)+1];
       if (signal_method) strcpy(signal_method, signal);

       char *signal_proto;
       char *tmp;

       if ((signal_proto = strchr(signal_method,'('))) {
          // substitute first '(' symbol with '\0'
          *signal_proto++ = '\0';
          // substitute last ')' symbol with '\0'
          if ((tmp = strrchr(signal_proto,')'))) *tmp = '\0';
       }

       if (!signal_proto) signal_proto = (char*)""; // avoid zero strings

       // if delegation object TQObjSender is used get the real sender class
       if (sender && sender_class == TQObjSender::Class()) {
          sender_class = gROOT->GetClass(sender->GetSenderClassName());
          if (!sender_class) {
             ::Error("TQObject::CheckConnectArgs", "for signal/slot consistency\n"
                     "checking need to specify class name as argument to "
                     "RQ_OBJECT macro");
             delete [] signal_method;
             return -1;
          }
       }

       Int_t nargs;
       TMethod *signalMethod = GetMethodWithPrototype(sender_class,
                                                      signal_method,
                                                      signal_proto,
                                                      nargs);
       if (!signalMethod) {
          ::Error("TQObject::CheckConnectArgs",  "signal %s::%s(%s) does not exist",
                  sender_class->GetName(), signal_method, signal_proto);
          delete [] signal_method;
          return -1;
       }
       Int_t nsigargs = nargs;

    #if defined(CHECK_COMMENT_STRING)
       const char *comment = 0;
       if (signalMethod != (TMethod *) -1)   // -1 in case of interpreted class
          comment = signalMethod->GetCommentString();

       if (!comment || !strlen(comment) || strstr(comment,"*SIGNAL")){
          ::Error("TQObject::CheckConnectArgs",
                  "signal %s::%s(%s), to declare signal use comment //*SIGNAL*",
                  sender_class->GetName(), signal_method, signal_proto);
          delete [] signal_method;
          return -1;
       }
    #endif

       // cleaning
       delete [] signal_method;

       char *slot_method = new char[strlen(slot)+1];
       if (slot_method) strcpy(slot_method, slot);

       char *slot_proto;
       char *slot_params = 0;

       if ((slot_proto = strchr(slot_method,'('))) {

          // substitute first '(' symbol with '\0'
          *slot_proto++ = '\0';

          // substitute last ')' symbol with '\0'
          if ((tmp = strrchr(slot_proto,')'))) *tmp = '\0';
       }

       if (!slot_proto) slot_proto = (char*)"";     // avoid zero strings
       if ((slot_params = strchr(slot_proto,'='))) *slot_params = ' ';

       TFunction *slotMethod = 0;
       if (!receiver_class) {
          // case of slot_method is compiled/intrepreted function
          slotMethod = (TFunction*)gROOT->GetListOfGlobalFunctions(kTRUE)->
                                               FindObject(slot_method);
       } else {
          slotMethod  = !slot_params ?
                              GetMethodWithPrototype(receiver_class,
                                                     slot_method,
                                                     slot_proto,
                                                     nargs) :
                              GetMethod(receiver_class,
                                        slot_method, slot_params);
       }

       if (!slotMethod) {
          if (!slot_params) {
             ::Error("TQObject::CheckConnectArgs", "slot %s(%s) does not exist",
                     receiver_class ? Form("%s::%s", receiver_class->GetName(),
                     slot_method) : slot_method, slot_proto);
          } else {
             ::Error("TQObject::CheckConnectArgs", "slot %s(%s) does not exist",
                     receiver_class ? Form("%s::%s", receiver_class->GetName(),
                     slot_method) : slot_method, slot_params);
          }
          delete [] slot_method;
          return -1;
       }

    #if defined(CHECK_ARGS_NUMBER)
       if (slotMethod != (TMethod *) -1 && slotMethod->GetNargsOpt() >= 0 &&
           nsigargs < (slotMethod->GetNargs() - slotMethod->GetNargsOpt())) {
          ::Error("TQObject::CheckConnectArgs",
                  "inconsistency in numbers of arguments");
          delete [] slot_method;
          return -1;
       }
    #endif

       // cleaning
       delete [] slot_method;

       return nsigargs;
    }

    ////////////////////////////////////////////////////////////////////////////////
    //                                                                            //
    //    TQConnectionList is the named list of connections,                      //
    //    see also TQConnection class.                                            //
    //                                                                            //
    ////////////////////////////////////////////////////////////////////////////////
    class TQConnectionList : public TList {

    private:
       Int_t   fSignalArgs;    // number of arguments in signal function

    public:
       TQConnectionList(const char *name, Int_t nsigargs) : TList()
          { fName = name; fSignalArgs = nsigargs; }
       virtual ~TQConnectionList();

       Bool_t Disconnect(void *receiver=0, const char *slot_name=0);
       Int_t  GetNargs() const { return fSignalArgs; }
       void   ls(Option_t *option = "") const;
       void   Print(Option_t *option = "") const;
       void   Print(Option_t *, Option_t *option) const { Print(option); }
    };

    //______________________________________________________________________________
    TQConnectionList::~TQConnectionList()
    {
       // Destructor.

       TIter next(this);
       TQConnection *connection;

       while ((connection = (TQConnection*)next())) {
          // remove this from feed back reference list
          connection->Remove(this);
          if (connection->IsEmpty()) delete connection;
       }
       Clear("nodelete");
    }

    //______________________________________________________________________________
    Bool_t TQConnectionList::Disconnect(void *receiver, const char *slot_name)
    {
       // Remove connection from the list. For more info see
       // TQObject::Disconnect()

       TQConnection *connection = 0;
       Bool_t return_value = kFALSE;

       TObjLink *lnk = FirstLink();
       TObjLink *savlnk; // savlnk is used when link is deleted

       while (lnk) {
          connection = (TQConnection*)lnk->GetObject();
          const char *name = connection->GetName();
          void *obj = connection->GetReceiver();

          if (!slot_name || !strlen(slot_name)
                         || !strcmp(name,slot_name)) {

             if (!receiver || (receiver == obj)) {
                return_value = kTRUE;
                savlnk = lnk->Next();   // keep next link ..
                Remove(lnk);
                lnk = savlnk;           // current link == saved ...
                connection->Remove(this);      // remove back reference
                if (connection->IsEmpty()) SafeDelete(connection);
                continue;               // .. continue from saved link
             }
          }
          lnk = lnk->Next();
       }
       return return_value;
    }

    //______________________________________________________________________________
    void TQConnectionList::ls(Option_t *option) const
    {
       // List signal name and list all connections in this signal list.

       cout <<  "TQConnectionList:" << "\t" << GetName() << endl;
       ((TQConnectionList*)this)->ForEach(TQConnection,Print)(option);
    }

    //______________________________________________________________________________
    void TQConnectionList::Print(Option_t *) const
    {
       // Print signal name.

       cout << "TQConnectionList:" << "\t" << GetName() << endl;
    }

    //______________________________________________________________________________
     TQObject::TQObject()
    {
       // TQObject Constructor.
       // Comment:
       //  - In order to minimize memory allocation fListOfSignals and
       //    fListOfConnections are allocated only if it is neccesary
       //  - When fListOfSignals/fListOfConnections are empty they will
       //    be deleted

       fListOfSignals     = 0;
       fListOfConnections = 0;
    }

    //______________________________________________________________________________
     TQObject::~TQObject()
    {
       // TQObject Destructor.
       //    - delete all connections and signal list

       if (!gROOT) return;

       Destroyed();   // emit "Destroyed()" signal

       if (fListOfSignals) {
          fListOfSignals->Delete();
          SafeDelete(fListOfSignals);   // delete list of signals
       }

       // loop over all connections and remove references to this object
       if (fListOfConnections) {
          TIter next_connection(fListOfConnections);
          TQConnection *connection;

          while ((connection = (TQConnection*)next_connection())) {
             TIter next_list(connection);
             TQConnectionList *list;
             while ((list = (TQConnectionList*)next_list())) {
                list->Remove(connection);
                if (list->IsEmpty()) SafeDelete(list);
             }
          }
          SafeDelete(fListOfConnections);
       }
    }

    //______________________________________________________________________________
     TList *TQObject::GetListOfClassSignals() const
    {
       // Returns pointer to list of signals of this class.

       TQClass *qcl = 0;

       qcl = dynamic_cast<TQClass*>(IsA());

       return qcl ? qcl->fListOfSignals : 0; //!!
    }

    //______________________________________________________________________________
     void TQObject::HighPriority(const char *signal_name, const char *slot_name)
    {
       // 1. If slot_name = 0 => makes signal defined by the signal_name
       //    to be the first in the fListOfSignals, this decreases
       //    the time for lookup.
       // 2. If slot_name != 0 => makes slot defined by the slot_name
       //    to be executed first when signal_name is emitted.

       TQConnectionList *clist = 0;
       TIter    next_list(fListOfSignals);
       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal_name,clist->GetName()))
             break;
       }

       if (!clist)  return;      // not found
       if (!slot_name)  {        // update list of signal lists
          fListOfSignals->Remove(clist);   // remove and add first
          fListOfSignals->AddFirst(clist);
          return;
       } else {                   // slot_name != 0 , update signal list
          TQConnection *con = 0;
          TIter next_con(clist);
          while ((con = (TQConnection*)next_con())) {
             if (!strcmp(slot_name,con->GetName()))
                break;
          }

          if (!con) return;       // not found
          clist->Remove(con);     // remove and add as first
          clist->AddFirst(con);
       }
    }

    //______________________________________________________________________________
     void TQObject::LowPriority(const char *signal_name, const char *slot_name)
    {
       // 1. If slot_name = 0 => makes signal defined by the signal_name
       //    to be the last in the fListOfSignals, this increase the time
       //    for lookup.
       // 2. If slot_name != 0 => makes slot defined by the slot_name
       //    to  be executed last when signal_name is emitted.

       TQConnectionList *clist = 0;
       TIter    next_list(fListOfSignals);
       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal_name,clist->GetName()))
             break;
       }

       if (!clist)   return;
       if (!slot_name)  {
          fListOfSignals->Remove(clist);   // remove and add first
          fListOfSignals->AddLast(clist);
          return;
       } else  {                  // slot_name != 0 , update signal list
          TQConnection *con = 0;
          TIter next_con(clist);
          while ((con = (TQConnection*)next_con())) {
             if (!strcmp(slot_name,con->GetName()))  break;
          }

          if (!con) return;
          clist->Remove(con);     // remove and add as last
          clist->AddLast(con);
       }
    }

    //______________________________________________________________________________
     Bool_t TQObject::HasConnection(const char *signal_name) const
    {
       // Return true if there is any object connected to this signal.
       // Only checks for object signals.

       if (!fListOfSignals)
          return kFALSE;

       register TQConnectionList *clist  = 0;
       char *signal = CompressName(signal_name);

       // check object signals
       TIter next_list(fListOfSignals);
       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal, clist->GetName())) {
             delete [] signal;
             return kTRUE;
          }
       }
       delete [] signal;
       return kFALSE;
    }

    //______________________________________________________________________________
     Int_t TQObject::NumberOfSignals() const
    {
       // Return number of signals for this object.

       if (fListOfSignals)
          return fListOfSignals->GetSize();
       return 0;
    }

    //______________________________________________________________________________
     Int_t TQObject::NumberOfConnections() const
    {
       // Return number of connections for this object.

       if (fListOfConnections)
          return fListOfConnections->GetSize();
       return 0;
    }

    //______________________________________________________________________________
     void TQObject::Emit(const char *signal_name)
    {
       // Acitvate signal without args.
       // Example:
       //          theButton->Emit("Clicked()");

       TList *slist = GetListOfClassSignals();

       if ((!slist && !fListOfSignals) || !signal_name)
          return;

       register TQConnectionList *clist  = 0;
       register TQConnection *connection = 0;

       char *signal = CompressName(signal_name);

       // execute class signals
       if (slist) {
          TIter nextcl_list(slist);
          while ((clist = (TQConnectionList*)nextcl_list())) {
             if (!strcmp(signal,clist->GetName())) break;
          }

          if (clist) {
             TIter nextcl(clist);
             while ((connection = (TQConnection*)nextcl())) {
                gTQSender = GetSender();
                connection->ExecuteMethod();
             }
          }
       }
       if (!fListOfSignals) {
          delete [] signal;
          return;
       }

       // execute object signals
       TIter next_list(fListOfSignals);
       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal,clist->GetName())) break;
       }
       if (!clist) {
          delete [] signal;
          return;
       }

       TIter next(clist);
       while (fListOfSignals && (connection = (TQConnection*)next())) {
          gTQSender = GetSender();
          connection->ExecuteMethod();
       }
       delete [] signal;
    }

    //______________________________________________________________________________
     void TQObject::EmitVA(const char *signal_name, Int_t va_(nargs), ...)
    {
       // Activate signal with variable argument list.
       // Example:
       //          theButton->EmitVA("Clicked(int,float)", 2, id, fid)

       va_list ap;
       va_start(ap, va_(nargs));

       EmitVA(signal_name, va_(nargs), ap);

       va_end(ap);
    }

    //______________________________________________________________________________
     void TQObject::EmitVA(const char *signal_name, Int_t nargs, va_list ap)
    {
       // Activate signal with variable argument list.
       // For internal use and for var arg EmitVA() in RQ_OBJECT.h.

       TList *slist = GetListOfClassSignals();

       if ((!slist && !fListOfSignals) || !signal_name)
          return;

       register TQConnectionList *clist  = 0;
       register TQConnection *connection = 0;

       char *signal = CompressName(signal_name);

       // execute class signals
       if (slist) {
          TIter nextcl_list(slist);
          while ((clist = (TQConnectionList*)nextcl_list())) {
             if (!strcmp(signal,clist->GetName())) break;
          }

          if (clist) {
             TIter nextcl(clist);
             while ((connection = (TQConnection*)nextcl())) {
                gTQSender = GetSender();
                connection->ExecuteMethod(nargs, ap);
             }
          }
       }
       if (!fListOfSignals) {
          delete [] signal;
          return;
       }

       // execute object signals
       TIter next_list(fListOfSignals);
       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal,clist->GetName())) break;
       }
       if (!clist) {
          delete [] signal;
          return;
       }

       TIter next(clist);
       while (fListOfSignals && (connection = (TQConnection*)next())) {
          gTQSender = GetSender();
          connection->ExecuteMethod(nargs, ap);
       }
       delete [] signal;
    }

    //______________________________________________________________________________
     void TQObject::Emit(const char *signal_name, Long_t param)
    {
       // Activate signal with single parameter.
       // Example:
       //          theButton->Emit("Clicked(int)",id)

       TList *slist = GetListOfClassSignals();

       if ((!slist && !fListOfSignals) || !signal_name)
          return;

       register TQConnectionList *clist  = 0;
       register TQConnection *connection = 0;

       char *signal = CompressName(signal_name);

       // execute class signals
       if (slist) {
          TIter nextcl_list(slist);
          while ((clist = (TQConnectionList*)nextcl_list())) {
             if (!strcmp(signal,clist->GetName())) break;
          }

          if (clist) {
             TIter nextcl(clist);
             while ((connection = (TQConnection*)nextcl())) {
                gTQSender = GetSender();
                connection->ExecuteMethod(param);
             }
          }
       }
       if (!fListOfSignals) {
          delete [] signal;
          return;
       }

       // execute object signals
       TIter next_list(fListOfSignals);
       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal,clist->GetName())) break;
       }
       if (!clist) {
          delete [] signal;
          return;
       }

       TIter next(clist);
       while (fListOfSignals && (connection = (TQConnection*)next())) {
          gTQSender = GetSender();
          connection->ExecuteMethod(param);
       }
       delete [] signal;
    }

    //______________________________________________________________________________
     void TQObject::Emit(const char *signal_name, Long64_t param)
    {
       // Activate signal with single parameter.
       // Example:
       //          theButton->Emit("Progress(Long64_t)",processed)

       TList *slist = GetListOfClassSignals();

       if ((!slist && !fListOfSignals) || !signal_name)
          return;

       register TQConnectionList *clist  = 0;
       register TQConnection *connection = 0;

       char *signal = CompressName(signal_name);

       // execute class signals
       if (slist) {
          TIter nextcl_list(slist);
          while ((clist = (TQConnectionList*)nextcl_list())) {
             if (!strcmp(signal,clist->GetName())) break;
          }

          if (clist) {
             TIter nextcl(clist);
             while ((connection = (TQConnection*)nextcl())) {
                gTQSender = GetSender();
                connection->ExecuteMethod(param);
             }
          }
       }
       if (!fListOfSignals) {
          delete [] signal;
          return;
       }

       // execute object signals
       TIter next_list(fListOfSignals);
       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal,clist->GetName())) break;
       }
       if (!clist) {
          delete [] signal;
          return;
       }

       TIter next(clist);
       while (fListOfSignals && (connection = (TQConnection*)next())) {
          gTQSender = GetSender();
          connection->ExecuteMethod(param);
       }
       delete [] signal;
    }

    //______________________________________________________________________________
     void TQObject::Emit(const char *signal_name, Double_t param)
    {
       // Activate signal with single parameter.
       // Example:
       //          theButton->Emit("Scale(float)",factor)

       TList *slist = GetListOfClassSignals();

       if ((!slist && !fListOfSignals) || !signal_name)
          return;

       register TQConnectionList *clist  = 0;
       register TQConnection *connection = 0;

       char *signal = CompressName(signal_name);

       // execute class signals
       if (slist) {
          TIter nextcl_list(slist);
          while ((clist = (TQConnectionList*)nextcl_list())) {
             if (!strcmp(signal,clist->GetName())) break;
          }

          if (clist) {
             TIter nextcl(clist);
             while ((connection = (TQConnection*)nextcl())) {
                gTQSender = GetSender();
                connection->ExecuteMethod(param);
             }
          }
       }
       if (!fListOfSignals) {
          delete [] signal;
          return;
       }

       // execute object signals
       TIter next_list(fListOfSignals);
       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal,clist->GetName())) break;
       }

       if (!clist) {
          delete [] signal;
          return;
       }

       TIter next(clist);
       while (fListOfSignals && (connection = (TQConnection*)next())) {
          gTQSender = GetSender();
          connection->ExecuteMethod(param);
       }
       delete [] signal;
    }

    //______________________________________________________________________________
     void TQObject::Emit(const char *signal_name, const char *params)
    {
       // Activate signal with parameter text string.
       // Example:
       //          myObject->Emit("Error(char*)","Fatal error");

       TList *slist = GetListOfClassSignals();

       if ((!slist && !fListOfSignals) || !signal_name)
          return;

       register TQConnectionList *clist  = 0;
       register TQConnection *connection = 0;

       char *signal = CompressName(signal_name);

       // execute class signals
       if (slist) {
          TIter nextcl_list(slist);
          while ((clist = (TQConnectionList*)nextcl_list())) {
             if (!strcmp(signal,clist->GetName())) break;
          }

          if (clist) {
             TIter nextcl(clist);
             while ((connection = (TQConnection*)nextcl())) {
                gTQSender = GetSender();
                connection->ExecuteMethod(params);
             }
          }
       }
       if (!fListOfSignals) {
          delete [] signal;
          return;
       }

       // execute object signals
       TIter next_list(fListOfSignals);
       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal,clist->GetName())) break;
       }
       if (!clist) {
          delete [] signal;
          return;
       }

       TIter next(clist);
       while (fListOfSignals && (connection = (TQConnection*)next())) {
          gTQSender = GetSender();
          connection->ExecuteMethod(params);
       }
       delete [] signal;
    }

    //______________________________________________________________________________
     void TQObject::Emit(const char *signal_name, Long_t *paramArr)
    {
       // Emit a signal with a varying number of arguments,
       // paramArr is an array of the parameters.
       // Note: any parameter should be converted to long type.
       // Example:
       //    TQObject *processor; // data processor
       //    TH1F     *hist;      // filled with processor results
       //
       //    processor->Connect("Evaluated(Float_t,Float_t)",
       //                       "TH1F",hist,"Fill12(Axis_t,Axis_t)");
       //
       //    Long_t args[2];
       //    args[0] = (Long_t)processor->GetValue(1);
       //    args[1] = (Long_t)processor->GetValue(2);
       //
       //    processor->Emit("Evaluated(Float_t,Float_t)",args);

       TList *slist = GetListOfClassSignals();

       if ((!slist && !fListOfSignals) || !signal_name)
          return;

       register TQConnectionList *clist  = 0;
       register TQConnection *connection = 0;

       char *signal = CompressName(signal_name);

       // execute class signals
       if (slist) {
          TIter nextcl_list(slist);
          while ((clist = (TQConnectionList*)nextcl_list())) {
             if (!strcmp(signal,clist->GetName())) break;
          }

          if (clist) {
             TIter nextcl(clist);
             while ((connection = (TQConnection*)nextcl())) {
                gTQSender = GetSender();
                connection->ExecuteMethod(paramArr, clist->GetNargs());
             }
          }
       }
       if (!fListOfSignals) {
          delete [] signal;
          return;
       }

       // execute object signals
       TIter next_list(fListOfSignals);
       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal,clist->GetName())) break;
       }
       if (!clist) {
          delete [] signal;
          return;
       }

       TIter next(clist);
       while (fListOfSignals && (connection = (TQConnection*)next())) {
          gTQSender = GetSender();
          connection->ExecuteMethod(paramArr, clist->GetNargs());
       }
       delete [] signal;
    }

    //______________________________________________________________________________
     Bool_t TQObject::ConnectToClass(TQObject *sender,
                                    const char *signal,
                                    TClass *cl,
                                    void *receiver,
                                    const char *slot)
    {
       // Create connection between sender and receiver.
       // Receiver class needs to have a dictionary.

       // sender should be TQObject
       if (!sender->IsA()->InheritsFrom(TQObject::Class()))
          return kFALSE;

       // remove "const" and strip blanks
       char *signal_name = CompressName(signal);
       char *slot_name   = CompressName(slot);

       // check consitency of signal/slot methods/args
       Int_t nsigargs;
       if ((nsigargs = CheckConnectArgs(sender, sender->IsA(), signal_name, cl, slot_name)) == -1)
          return kFALSE;

       if (!sender->fListOfSignals)
          sender->fListOfSignals = new TList();

       TQConnectionList *clist=0;
       TIter next_list(sender->fListOfSignals);

       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal_name,clist->GetName())) break;
       }

       if (!clist) {
          clist = new TQConnectionList(signal_name, nsigargs);
          sender->fListOfSignals->Add(clist);
       }

       TIter next(clist);
       TQConnection *connection = 0;

       while ((connection = (TQConnection*)next())) {
          if (!strcmp(slot_name,connection->GetName()) &&
              (receiver == connection->GetReceiver())) break;
       }

       if (!connection)
          connection = new TQConnection(cl, receiver, slot_name);

       // check to prevent multiple entries
       if (!clist->FindObject(connection)) {
          clist->Add(connection);
          if (!connection->FindObject(clist)) connection->Add(clist);
          sender->Connected(signal_name);
       }

       // cleaning
       if (signal_name) { delete [] signal_name; signal_name = 0; }
       if (slot_name) { delete [] slot_name; slot_name = 0; }

       return kTRUE;
    }

    //______________________________________________________________________________
     Bool_t TQObject::ConnectToClass(const char *class_name,
                                    const char *signal,
                                    TClass *cl,
                                    void *receiver,
                                    const char *slot)
    {
       // This method allows to make connection from any object
       // of the same class to the receiver object.
       // Receiver class needs to have a dictionary.

       TClass *sender = gROOT->GetClass(class_name);

       // sender class should be TQObject (i.e. TQClass)
       if (!sender || !sender->IsA()->InheritsFrom(TQObject::Class()))
          return kFALSE;

       TList *slist = ((TQClass*)sender)->fListOfSignals;
       char *signal_name = CompressName(signal);
       char *slot_name   = CompressName(slot);

       // check consitency of signal/slot methods/args
       Int_t nsigargs;
       if ((nsigargs = CheckConnectArgs(0, sender, signal_name, cl, slot_name)) == -1)
          return kFALSE;

       TQConnectionList *clist = 0;

       if (!slist)
          ((TQClass*)sender)->fListOfSignals = slist = new TList();

       TIter next_list(slist);
       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal_name,clist->GetName())) break;
       }

       if (!clist) {
          clist = new TQConnectionList(signal_name, nsigargs);
          slist->Add(clist);
       }

       TQConnection *connection = 0;
       TIter next(clist);

       while ((connection = (TQConnection*)next())) {
          if (!strcmp(slot_name,connection->GetName()) &&
              (receiver == connection->GetReceiver())) break;
       }

       if (!connection)
          connection = new TQConnection(cl, receiver, slot_name);

       // check to prevent multiple entries
       if (!clist->FindObject(connection)) {
          clist->Add(connection);
          if (!connection->FindObject(clist)) connection->Add(clist);
          ((TQClass*)sender)->Connected(signal_name);
       }

       // cleaning
       if (signal_name)  { delete [] signal_name; signal_name = 0; }
       if (slot_name) { delete [] slot_name; slot_name = 0; }

       return kTRUE;
    }

    //______________________________________________________________________________
     Bool_t TQObject::Connect(TQObject *sender,
                             const char *signal,
                             const char *cl,
                             void *receiver,
                             const char *slot)
    {
       // Create connection between sender and receiver.
       // Signal and slot string must have a form:
       //    "Draw(char*, Option_t* ,Int_t)"
       // All blanks and "const" words will be removed,
       //
       // cl != 0 - class name, it can be class with or
       //           without dictionary, e.g interpreted class.
       // Example:
       //       TGButton *myButton;
       //       TH2F     *myHist;
       //
       //       TQObject::Connect(myButton,"Clicked()",
       //                         "TH2F", myHist,"Draw(Option_t*)");
       //
       // cl == 0 - corresponds to function (interpereted or global)
       //           the name of the function is defined by the slot string,
       //           parameter receiver should be 0.
       // Example:
       //       TGButton *myButton;
       //       TH2F     *myHist;
       //
       //       TQObject::Connect(myButton,"Clicked()",
       //                         0, 0,"hsimple()");
       //
       // Warning:
       //  If receiver is class not derived from TQObject and going to be
       //  deleted, disconnect all connections to this receiver.
       //  In case of class derived from TQObject it is done automatically.

       if (cl) {
          TClass *rcv_cl = gROOT->GetClass(cl);
          if (rcv_cl) return ConnectToClass(sender, signal, rcv_cl, receiver, slot);
       }

       // the following is the case of receiver class without dictionary
       // e.g. interpreted class or function.

       // sender should be TQObject
       if (!sender->IsA()->InheritsFrom(TQObject::Class()))
          return kFALSE;

       // remove "const" and strip blanks
       char *signal_name = CompressName(signal);
       char *slot_name   = CompressName(slot);

       // check consitency of signal/slot methods/args
       Int_t nsigargs;
       if ((nsigargs = CheckConnectArgs(sender, sender->IsA(), signal_name, 0, slot_name)) == -1)
          return kFALSE;

       if (!sender->fListOfSignals) sender->fListOfSignals = new TList();

       TQConnectionList *clist = 0;
       TIter next_list(sender->fListOfSignals);

       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal_name,clist->GetName())) break;
       }

       if (!clist) {
          clist = new TQConnectionList(signal_name, nsigargs);
          sender->fListOfSignals->Add(clist);
       }

       TQConnection *connection = 0;
       TIter next(clist);

       while ((connection = (TQConnection*)next())) {
          if (!strcmp(slot_name,connection->GetName()) &&
              (receiver == connection->GetReceiver())) break;
       }

       if (!connection)
          connection = new TQConnection(cl, receiver, slot_name);

       // check to prevent multiple entries
       if (!clist->FindObject(connection)) {
          clist->Add(connection);
          if (!connection->FindObject(clist)) connection->Add(clist);
          sender->Connected(signal_name);
       }

       // cleaning
       if (signal_name) { delete [] signal_name; signal_name = 0; }
       if (slot_name) { delete [] slot_name; slot_name = 0; }

       return kTRUE;
    }

    //______________________________________________________________________________
     Bool_t TQObject::Connect(const char *class_name,
                             const char *signal,
                             const char *cl,
                             void *receiver,
                             const char *slot)
    {
       // This method allows to make a connection from any object
       // of the same class to a single slot.
       // Signal and slot string must have a form:
       //    "Draw(char*, Option_t* ,Int_t)"
       // All blanks and "const" words will be removed,
       //
       // cl != 0 - class name, it can be class with or
       //           without dictionary, e.g interpreted class.
       // Example:
       //       TGButton *myButton;
       //       TH2F     *myHist;
       //
       //       TQObject::Connect("TGButton", "Clicked()",
       //                         "TH2F", myHist, "Draw(Option_t*)");
       //
       // cl == 0 - corresponds to function (interpereted or global)
       //           the name of the function is defined by the slot string,
       //           parameter receiver should be 0.
       // Example:
       //       TGButton *myButton;
       //       TH2F     *myHist;
       //
       //       TQObject::Connect("TGButton", "Clicked()",
       //                         0, 0, "hsimple()");
       //
       // Warning:
       //  If receiver class not derived from TQObject and going to be
       //  deleted, disconnect all connections to this receiver.
       //  In case of class derived from TQObject it is done automatically.

       if (cl) {
          TClass *rcv_cl = gROOT->GetClass(cl);
          if (rcv_cl) return ConnectToClass(class_name, signal, rcv_cl, receiver,
                                            slot);
       }

       // the following is case of receiver class without dictionary
       // e.g. interpreted class or function.

       TClass *sender = gROOT->GetClass(class_name);

       // sender class should be TQObject (i.e. TQClass)
       if (!sender || !sender->IsA()->InheritsFrom(TQObject::Class()))
          return kFALSE;

       TList *slist = ((TQClass*)sender)->fListOfSignals;

       char *signal_name = CompressName(signal);
       char *slot_name   = CompressName(slot);

       // check consitency of signal/slot methods/args
       Int_t nsigargs;
       if ((nsigargs = CheckConnectArgs(0, sender, signal_name, 0, slot_name)) == -1)
          return kFALSE;

       TQConnectionList *clist = 0;

       if (!slist) {
          slist = ((TQClass*)sender)->fListOfSignals = new TList();
       }

       TIter next_list(slist);

       while ((clist = (TQConnectionList*)next_list()))  {
          if (!strcmp(signal_name,clist->GetName())) break;
       }

       if (!clist) {
          clist = new TQConnectionList(signal_name, nsigargs);
          slist->Add(clist);
       }

       TQConnection *connection = 0;
       TIter next(clist);

       while ((connection = (TQConnection*)next())) {
          if (!strcmp(slot_name,connection->GetName()) &&
              (receiver == connection->GetReceiver())) break;
       }

       if (!connection)
          connection = new TQConnection(cl, receiver, slot_name);

       // check to prevent multiple entries
       if (!clist->FindObject(connection)) {
          clist->Add(connection);
          if (!connection->FindObject(clist)) connection->Add(clist);
          ((TQClass*)sender)->Connected(signal_name);
       }

       // cleaning
       if (signal_name)  { delete [] signal_name; signal_name = 0; }
       if (slot_name) { delete [] slot_name; slot_name = 0; }

       return kTRUE;
    }

    //______________________________________________________________________________
     Bool_t TQObject::Connect(const char *signal,
                             const char *receiver_class,
                             void *receiver,
                             const char *slot)
    {
       // Non-static method is used to connect from the signal
       // of this object to the receiver slot.
       //
       // Warning! No check on consistency of sender/receiver
       // classes/methods.
       //
       // This method makes possible to have connection/signals from
       // interpreted class. See also RQ_OBJECT.h.

       // remove "const" and strip blanks
       char *signal_name = CompressName(signal);
       char *slot_name   = CompressName(slot);

       // check consitency of signal/slot methods/args
       TClass *cl = 0;
       if (receiver_class)
          cl = gROOT->GetClass(receiver_class);
       Int_t nsigargs;
       if ((nsigargs = CheckConnectArgs(this, IsA(), signal_name, cl, slot_name)) == -1)
          return kFALSE;

       if (!fListOfSignals) fListOfSignals = new TList();

       TQConnectionList *clist = 0;
       TIter next_list(fListOfSignals);

       while ((clist = (TQConnectionList*)next_list())) {
          if (!strcmp(signal_name,clist->GetName())) break;
       }

       if (!clist) {
          clist = new TQConnectionList(signal_name, nsigargs);
          fListOfSignals->Add(clist);
       }

       TIter next(clist);
       TQConnection *connection = 0;

       while ((connection = (TQConnection*)next())) {
          if (!strcmp(slot_name,connection->GetName()) &&
              (receiver == connection->GetReceiver())) break;
       }

       if (!connection)
          connection = new TQConnection(receiver_class, receiver, slot_name);

       // check to prevent multiple entries
       if (!clist->FindObject(connection)) {
          clist->Add(connection);
          if (!connection->FindObject(clist)) connection->Add(clist);
          Connected(signal_name);
       }

       // cleaning
       if (signal_name) { delete [] signal_name; signal_name = 0; }
       if (slot_name) { delete [] slot_name; slot_name = 0; }

       return kTRUE;
    }

    //______________________________________________________________________________
     Bool_t TQObject::Disconnect(TQObject *sender,
                                const char *signal,
                                void *receiver,
                                const char *slot)
    {
       // Disconnects signal in object sender from slot_method in
       // object receiver. For objects derived from TQObject signal-slot
       // connection is removed when either of the objects involved
       // are destroyed.
       //
       // Disconnect() is typically used in three ways, as the following
       // examples shows:
       //
       //  - Disconnect everything connected to an object's signals:
       //       Disconnect(myObject);
       //  - Disconnect everything connected to a signal:
       //       Disconnect(myObject, "mySignal()");
       //  - Disconnect a specific receiver:
       //       Disconnect(myObject, 0, myReceiver, 0);
       //
       // 0 may be used as a wildcard in three of the four arguments,
       // meaning "any signal", "any receiving object" or
       // "any slot in the receiving object", respectively.
       //
       // The sender has no default and may never be 0
       // (you cannot disconnect signals from more than one object).
       //
       // If signal is 0, it disconnects receiver and slot_method
       // from any signal. If not, only the specified signal is
       // disconnected.
       //
       // If  receiver is 0, it disconnects anything connected to signal.
       // If not, slots in objects other than receiver are not
       // disconnected
       //
       // If slot_method is 0, it disconnects anything that is connected
       // to receiver.  If not, only slots named slot_method will be
       // disconnected, and all other slots are left alone.
       // The slot_method must be 0 if receiver is left out, so you
       // cannot disconnect a specifically-named slot on all objects.

       Bool_t return_value = kFALSE;
       Bool_t next_return  = kFALSE;

       if (!sender->GetListOfSignals()) return kFALSE;

       char *signal_name = CompressName(signal);
       char *slot_name   = CompressName(slot);

       TQConnectionList *slist = 0;
       TIter next_signal(sender->GetListOfSignals());

       while ((slist = (TQConnectionList*)next_signal()))   {
          if (!signal_name) {                // disconnect all signals
             next_return = slist->Disconnect(receiver,slot_name);
             return_value = return_value || next_return;

             if (slist->IsEmpty()) {
                sender->GetListOfSignals()->Remove(slist);
                SafeDelete(slist);            // delete empty list
             }
          } else if (signal && !strcmp(signal_name,slist->GetName())) {
             next_return = slist->Disconnect(receiver,slot_name);
             return_value = return_value || next_return;

             if (slist->IsEmpty()) {
                sender->GetListOfSignals()->Remove(slist);
                SafeDelete(slist);            // delete empty list
                break;
             }
          }
       }

       if (sender->GetListOfSignals() && sender->GetListOfSignals()->IsEmpty()) {
          SafeDelete(sender->fListOfSignals);
       }

       // cleaning
       if (signal_name) { delete [] signal_name; signal_name = 0; }
       if (slot_name) { delete [] slot_name; slot_name = 0; }

       return return_value;
    }

    //______________________________________________________________________________
     Bool_t TQObject::Disconnect(const char *class_name,
                                const char *signal,
                                void *receiver,
                                const char *slot)
    {
       // Disconnects "class signal". The class is defined by class_name.
       // See also Connect(class_name,signal,receiver,slot).

       TClass *sender = gROOT->GetClass(class_name);

       // sender should be TQClass (which derives from TQObject)
       if (!sender->IsA()->InheritsFrom(TQObject::Class()))
          return kFALSE;

       TQClass *qcl = (TQClass*)sender;   // cast TClass to TQClass
       return Disconnect(qcl, signal, receiver, slot);
    }

    //______________________________________________________________________________
     Bool_t TQObject::Disconnect(const char *signal,
                                void *receiver,
                                const char *slot)
    {
       // Disconnects signal of this object from slot of receiver.
       // Equivalent to Disconnect(this, signal, receiver, slot)

       return Disconnect(this, signal, receiver, slot);
    }

    //______________________________________________________________________________
     void TQObject::Streamer(TBuffer &R__b)
    {
       // Stream an object of class TQObject.

       if (R__b.IsReading()) {
          // nothing to read
       } else {
          // nothing to write
       }
    }

    //______________________________________________________________________________
     void TQObject::LoadRQ_OBJECT()
    {
       // Load RQ_OBJECT.h which contains the #define RQ_OBJECT needed to
       // let interpreted classes connect to signals of compiled classes.

       G__load_text(RQ_OBJECT_STRING1);
       G__load_text(RQ_OBJECT_STRING2);
       G__load_text(RQ_OBJECT_STRING);

    }

    // Global function which simplifies making connection in interpreted
    // ROOT session
    //
    //  ConnectCINT      - connects to interpreter(CINT) command

    //______________________________________________________________________________
    Bool_t ConnectCINT(TQObject *sender, const char *signal, const char *slot)
    {
       TString str = "ProcessLine(=";
       str += '"';
       str += slot;
       str += '"';
       str += ")";
       return TQObject::Connect(sender, signal, "TInterpreter",
                                gInterpreter, str.Data());
    }