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Changing the pointer of a class member

AngelCode Affiliates

Started by 39ster April 01, 2008 12:06 AM

2 comments, last by WitchLord 16 years, 3 months ago

39ster

145

Author

April 01, 2008 12:06 AM

Alright say i have a class that looks like this: AngelScript


class Blah
{
  float x;
  float y;
}

Than i create an instance of it using CreateScriptObject() and i now want to change the pointer of the x and y to my own x and y. Like this: C++


float x, y;
(float*)instance->GetPropertyPointer(0) = &x
(float*)instance->GetPropertyPointer(1) = &y

What happens to the x and y that angel script created in CreateScriptObject()? Does it get freed?

WitchLord

4,838

April 06, 2008 08:06 AM

GetPropertyPointer() returns a pointer to the property so that you can read it's value or overwrite it. It doesn't let you change the actual location of the property.

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AngelScript - free scripting library - BMFont - free bitmap font generator - Tower - free puzzle game

39ster

145

Author

April 06, 2008 11:52 PM

Oh yeah. I was actually wondering how could that be possible until i looked at the examples of "GetReturnPointer()" and saw they were actually changing the value, not the pointer. It was the pointers to pointers that was confusing me.

WitchLord

4,838

April 07, 2008 08:27 PM

The name of the method doesn't help much either. I'm considering renaming it, e.g. to GetPointerToProperty().

AngelCode.com - game development and more - Reference DB - game developer references
AngelScript - free scripting library - BMFont - free bitmap font generator - Tower - free puzzle game