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tclcl-mappings.h：源码内容
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 *    used to endorse or promote products derived from this software without
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * @(#) $Header: /cvsroot/otcl-tclcl/tclcl/tclcl-mappings.h,v 1.15 2001/08/21 01:26:42 lloydlim Exp $
 */
#ifndef Tclcl_mappings_h
#define Tclcl_mappings_h
class TclObject;
class Tcl;
template <class T>
class TclObjectHelper {
protected:
	typedef int (T::*TMethod)(int argc,const char*const* argv);
	
	static int dispatch_(ClientData clientData, Tcl_Interp * /*interp*/,
		     int argc, char *argv[]) {
		Tcl& tcl = Tcl::instance();
		T *o = (T*) tcl.lookup(argv[0]);
		if (o!=NULL) {
			TMethod *pMethod = (TMethod*) clientData;
			return (o->*(*pMethod))(argc-2, argv+2);
		}
		tcl.resultf("Could not find TclObject for '%s'", argv[0]);
		return TCL_ERROR;
	}
};
class TclArguments {
public:
	TclArguments(int argc, const char * const *argv)
		: current_(2), argc_(argc), argv_(argv) { }
	~TclArguments() { }
	int arg(int &value);
	int arg(unsigned int &value);
	int arg(unsigned short &value);
	int arg(double &value);
	int arg(const char *&value);
	int arg(TclObject *&value);
	
	inline int more_args() const {
		return (current_ < argc_);
	}
	inline int current() const { return current_; }
	void add_error() const;
private:
	int next(const char *&arg);
	int current_, argc_;
	const char * const *argv_;
};
/*-------------------------------------------------------------------------*/
#define DECLARE_OTCLCLASS(classname, otclname)                              
                                                                            
static class classname ## _Class : public TclClass,                         
				   public TclObjectHelper<classname> {      
public:                                                                     
	typedef TclObjectHelper<classname> MyHelper;                        
	typedef classname MyTclObject;                                      
	                                                                    
	classname ## _Class() : TclClass(otclname) { }                      
	TclObject *create(int argc, const char*const* argv);                
	void otcl_mappings();                                               
} classname ## _class_obj
/*-------------------------------------------------------------------------*/
#define DEFINE_ABSTRACT_OTCL_CLASS(classname, otclname)                     
DECLARE_OTCLCLASS(classname, otclname);                                     
                                                                            
inline TclObject *classname ## _Class::create(int /*argc*/,                 
					      const char*const* /*argv*/) { 
        Tcl::instance().resultf("cannot create object of abstract class "   
				"'%s'", classname_);                        
	return NULL;                                                        
}                                                                           
                                                                            
void classname ## _Class::otcl_mappings()
/*-------------------------------------------------------------------------*/
#define DEFINE_OTCL_CLASS(classname, otclname)                              
DECLARE_OTCLCLASS(classname, otclname);                                     
                                                                            
inline TclObject *classname ## _Class::create(int /*argc*/,                 
					      const char*const* /*argv*/) { 
	return (new MyTclObject);			                    
}                                                                           
                                                                            
void classname ## _Class::otcl_mappings()
/*-------------------------------------------------------------------------*/
	
#define INSTPROC(c_method)                                                  
{                                                                           
	static MyHelper::TMethod method = &MyTclObject::c_method;           
	OTclAddIMethod(class_, #c_method, MyHelper::dispatch_,              
		       (void*) &method, NULL);                              
}
#define INSTPROC_PUBLIC(c_method)  INSTPROC(c_method)
#define INSTPROC_PRIVATE(c_method) INSTPROC(c_method)
/*-------------------------------------------------------------------------*/
#define PROC(c_static_method)                                               
{                                                                           
	int (*method)(int,const char*const*) = &MyTclObject::c_static_method;
	OTclAddPMethod((OTclObject*)class_, #c_static_method,               
		       TclObject::dispatch_static_proc,                     
		       (void*) method, NULL);                               
}
#define PROC_PUBLIC(c_static_method)   PROC(c_static_method)
#define PROC_PRIVATE(c_static_method)  PROC(c_static_method)
/*-------------------------------------------------------------------------*/
#define BEGIN_PARSE_ARGS(argc, argv)                                        
TclArguments _args_(argc, argv)
/*-------------------------------------------------------------------------*/
#define END_PARSE_ARGS                                                      
if (_args_.more_args()) {                                                   
	Tcl::instance().resultf("Extra arguments (starting at "             
				"argument %d)", _args_.current()-1);        
	_args_.add_error();                                                 
	return TCL_ERROR;                                                   
}
/*-------------------------------------------------------------------------*/
#define ARG(var)                                                            
do {                                                                        
	if (_args_.arg(var)==TCL_ERROR) {                                   
		return TCL_ERROR;                                           
	}                                                                   
} while (0)
/*-------------------------------------------------------------------------*/
	
#define ARG_DEFAULT(var, default)                                           
do {                                                                        
    	if (!_args_.more_args()) {                                          
                var = default;                                              
	}                                                                   
	else if (_args_.arg(var)==TCL_ERROR) {                              
		return TCL_ERROR;                                           
	}                                                                   
} while (0)
/*-------------------------------------------------------------------------*/
#endif // Tclcl_mappings_h
	

						