source: cpp/gdk/extvalue.h @ 57

// This file is a part of Framsticks GDK library.
// Copyright (C) 2002-2006  Szymon Ulatowski.  See LICENSE.txt for details.
// Refer to http://www.frams.alife.pl/ for further information.

#ifndef _EXTVALUE_H_
#define _EXTVALUE_H_

#include "sstring.h"
#include "param.h"

#define EXTVALUEUNION
#define EXTVALUEUNIONSIZE sizeof(SString)

enum ExtPType
{TUnknown=0,TInt,TDouble,TString,TObj};

/**
   destructable object
 */
class DestrBase
{
public:
int refcount;
DestrBase():refcount(0) {}
virtual ~DestrBase() {}
};

/**
   object reference.
 */
class ExtObject
{
int subtype;                    //< 0/1=Generic/DPC Object,  0/2=Standalone/Shared Param
void incref() const {if (subtype&1) dbobject->refcount++;}
void decref() const {if (subtype&1) if (!--dbobject->refcount) delete dbobject;}
  public:
union { void* object;           //< generic object, will use param
DestrBase *dbobject;};  //< object with refcounting, will be deleted if refcount goes to 0
union { Param* param;           //< if object!=0
        ParamInterface *paraminterface;}; //< if object==0

void copyFrom(const ExtObject& src)  {subtype=src.subtype;object=src.object;param=src.param;}

void* operator new(size_t s, void* mem) {return mem;}
#ifdef _MSC_VER
void operator delete(void* mem,void* t) {}
#endif
void* operator new(size_t s) {return malloc(sizeof(ExtObject));}
void operator delete(void* mem) {free(mem);}

ParamInterface *getParamInterface() const  {if(subtype&2){param->select(object);return param;} return paraminterface;}
const char* interfaceName() const {if (isEmpty()) return "Empty"; return getParamInterface()->getName();}
void* getTarget() const {return (subtype&1)?dbobject:object;}
void* getTarget(const char* classname) const {return strcmp(interfaceName(),classname)?0:getTarget();}
int isEmpty() const {return !param;}
ExtObject(const ExtObject& src)      {src.incref();copyFrom(src);}
void operator=(const ExtObject& src) {src.incref();decref();copyFrom(src);}

int operator==(const ExtObject& src) {if (object!=src.object) return 0; return (object==0)?(param==src.param):1;}

SString toString();

ExtObject(Param *p,void *o):subtype(2),object(o),param(p){}
ExtObject(ParamInterface *p=0):subtype(0),object(0),paraminterface(p){}
ExtObject(Param *p,DestrBase *o):subtype(1+2),dbobject(o),param(p){incref();}
ExtObject(ParamInterface *p,DestrBase *o):subtype(1),dbobject(o),paraminterface(p){incref();}

~ExtObject(){decref();}
};


class ExtValue
{
public:
ExtPType type;
#ifdef EXTVALUEUNION
long data[(EXTVALUEUNIONSIZE+sizeof(long)-1)/sizeof(long)];
long& idata() const {return (long&)data[0];};
double& ddata() const {return *(double*)data;};
ExtObject& odata() const {return *(ExtObject*)data;};
SString& sdata() const {return *(SString*)data;};
#else
union {
long i;
double d;
SString *s;
ExtObject *o;
};
long& idata() const {return (long&)i;};
double& ddata() const {return (double&)d;};
ExtObject& odata() const {return *o;};
SString& sdata() const {return *s;};
#endif

void* operator new(size_t s, void* mem) {return mem;}
void* operator new(size_t s) {return ::operator new(s);}

ExtValue():type(TUnknown){}
~ExtValue() {setEmpty();}
ExtValue(long v) {seti(v);}
ExtValue(double v) {setd(v);}
ExtValue(const SString &v) {sets(v);}
ExtValue(const ExtObject &srco) {seto(srco);}
long compare(const ExtValue& src) const;
int operator==(const ExtValue& src) const;
void operator+=(const ExtValue& src);
void operator-=(const ExtValue& src);
void operator*=(const ExtValue& src);
void operator/=(const ExtValue& src);
void operator%=(const ExtValue& src);
void operator=(const ExtValue& src)
        {setr(src);}
ExtValue(const ExtValue& src)
        :type(TUnknown) {set(src);}
void setEmpty();
ExtPType getType() {return type;}
void *getObjectTarget(const char* classname) {return (type==TObj)?getObject().getTarget(classname):0;}
void setInt(long v) {if (type!=TInt) setri(v); else idata()=v;}
void setDouble(double v) {if (type!=TDouble) setrd(v); else ddata()=v;}
void setString(const SString &v) {if (type!=TString) setrs(v); else sdata()=v;}
void setObject(const ExtObject &src) {if (type!=TObj) setro(src); else odata()=src;}
long getInt() const;
double getDouble() const;
SString getString() const;
ExtObject getObject() const;

ExtValue getExtType();

  private: // setrx - release and set, setx - assume released
void setr(const ExtValue& src){setEmpty();set(src);}
void set(const ExtValue& src);
void setri(long v) {setEmpty();seti(v);}
void setrd(double v) {setEmpty();setd(v);}
void seti(long v) {type=TInt;idata()=v;}
void setd(double v) {type=TDouble;ddata()=v;}
#ifdef EXTVALUEUNION
void setrs(const SString &v) {setEmpty();sets(v);}
void setro(const ExtObject &src) {setEmpty();seto(src);}
void sets(const SString &v) {type=TString;new(data) SString(v);}
void seto(const ExtObject &src) {type=TObj;new(data) ExtObject(src);}
#else
void setrs(const SString &v) {setEmpty();sets(v);}
void setro(const ExtObject &src) {setEmpty();seto(src);}
void sets(const SString &v) {type=TString;s=new SString(v);}
void seto(const ExtObject &src) {type=TObj;o=new ExtObject(src);}
#endif

};


#endif