Subj : Re: How to pass boolean value from C++ back to script? (jsapi)
To   : Christian Biesinger
From : Brendan Eich
Date : Wed Jan 05 2005 02:16 pm

Christian Biesinger wrote:
> Jens Bannmann wrote:
> 
>> |       JS_ValueToBoolean(cx, jsCheckState, &checkState);
> 
> 
> I'm thinking JSVAL_TO_BOOLEAN might be faster here...


Yes, given the condition guarding this line:

|     if (JS_GetProperty(cx, jsObject, "value", &jsCheckState)
|         && JSVAL_IS_BOOLEAN(jsCheckState))
|     {
|       JS_ValueToBoolean(cx, jsCheckState, &checkState);
|     }
|   }


If you know jsCheckState is of boolean type, then you can just untag it. 
  OTOH, this code owuld be more general if it dropped the 
JSVAL_IS_BOOLEAN clause and converted non-boolean types via the 
JS_ValueToBoolean.

/be

.