Subj : Re: How to convert some C-values to jsval?
To   : =?ISO-8859-1?Q?Georg_Maa=DF?= <georg@bioshop.de>
From : Brendan Eich <brendan@meer.net>
Date : Sat Aug 02 2003 01:38 pm

Georg Maaß wrote:

> BOOLEAN_TO_JSVAL converts a C++ bool

C boolean (int 0 or 1).  Same thing, but I wanted to stress that C++ can 
use C APIs such as the JS API, but JS does not have a C++ API.

  value to a jsval
> INT_TO_JSVAL converts a C++ int value to a jsval

These macros are for cases where you know the source domain, and also 
where you need speed and small code.

There are general ways to make values from various C types in the API, 
if you read down a little further in jsapi.h.

> 
> But how can I convert following C types to a jsval:
> 
> double

JS_NewNumberValue.

> unsigned int
> long (might be different to int)
> unsigned long

All of these must be cast to double and passed to JS_NewNumberValue.  JS 
(the language, not mozilla/js/src/ the SpiderMonkey implementation) does 
not have explicit integral types, only IEEE double and some 32-bit 
signed and unsigned types implicit in certain operators (the bitwise 
logicals), build-in properties (array lengths), and methods.

> char* / std::string

You are reading jsapi.h and the API docs, right?

/be

.