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Dynamic variable creating

Started by TheSorcerer Dec 29, 2002 at 5:03 AM 3 replies 100+ views

Original Post

Dec 29, 2002 at 5:03 AM

Is there a way to set the type of a variable during runtime? Somethink like:

  
UnkownType *TempVar;

if (...)
{
     TempVar = new UCHAR;
}
else if (...)
{
     TempVar = new USHORT;
}
else if (...)
{
     TempVar = new UINT;
}

elis-cool

107

elis-cool

Dec 29, 2002 at 5:15 AM

void my friend. The answer is void.

  
void* pUnknownType;
// your code;

or you could use a union, and just have all its possible types in it...

civguy

Dec 29, 2002 at 5:17 AM

No. You need to make an (abstract) base class that provides the operations you need from the type.

    
class SomeType {
  virtual void hitMe() = 0;
  virtual ~SomeType() {}
};

class Type1 : public SomeType {
  virtual void hitMe() {...}
};

class Type2 : public SomeType {
  virtual void hitMe() {...}
};

...

SomeType *TempVar;

if (...)
{
     TempVar = new Type1;
}
else if (...)
{
     TempVar = new Type2;
}