How to inherit a C++ class in JavaScript?

Question

I am embedding SpiderMonkey to make my C++ library scriptable. To make it extendable, I need it possible to define a new class (JavaScript) inheriting one C++ base class of the library.

Is there an example showing me how to do that using SpiderMonkey?

have you had a look at this: egachine.berlios.de/embedding-sm-best-practice/… ? — smerlin
– smerlin, Commented Jul 18, 2010 at 22:43
Thanks for your comment. I have read that article before, but I didn't find the solution to my question. My question is not to map Mapping inheritance of existing C++ classes. In my case, I wish I could sub-class existing C++ class in my Javascript code and use it in my C++ program. Many thanks. — ims
– ims, Commented Jul 18, 2010 at 23:13
Err... don't do that. One probably should not be inheriting from library classes; instead, make your class usable through composition. — Billy ONeal
– Billy ONeal, Commented Jul 18, 2010 at 23:20
Yes I was thinking about just providing a C++ scriptable base class which can call Javascript callback functions. Not sure if it's exactly what you meant :) Many thanks. BTW, any example is welcome. — ims
– ims, Commented Jul 18, 2010 at 23:42
The concept of inheritance between the two languages is not the same so I am not really sure what you mean...Anyhow, check this crockford.com/javascript/inheritance.html — Fraser
– Fraser, Commented Jul 19, 2010 at 12:47

Peter Mortensen · Accepted Answer · 2010-07-23 17:56:01Z

3

I'd think you cannot subclass a C++ class in SpiderMonkey/JavaScript and use it transparently in the rest of your C++ code. However, you could create a wrapping class in C++ that delegates its work to a couple of JavaScript classes/functions. If you make your C++ class configurable enough that should work for your situation. Both calling JavaScript code from C and C code from JavaScript is explaind in the JSAPI User Guide page (I think you've already read that one).

edited Jul 23, 2010 at 17:56

Peter Mortensen

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answered Jul 20, 2010 at 20:16

Simon Groenewolt

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Community · Accepted Answer · 2017-05-23 12:13:31Z

1

I don't know it's possible, but a feeling says you're better off writing a wrapper class in JavaScript for the class in the C++ library.

edited May 23, 2017 at 12:13

CommunityBot

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answered Jul 19, 2010 at 22:04

Görkem Paçacı

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