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Re: How to call a C++ function in Witz template? [message #39168 is a reply to message #39167]

Thu, 21 February 2013 12:08

dolik.rce
Messages: 1791
Registered: August 2008
Location: Czech Republic

Ultimate Contributor

Hi Peter,

Peter wrote on Thu, 21 February 2013 11:47

I assumed I just had to pass a pointer to my function as a value of shared variable MYFUN to make it visible in Witz template, but apparently that's not how it works. What's the correct way to do it?

It would be nice if it would work this way, but unfortunately it doesn't (at least not yet Smile

). You have to register the function and it has to have correct signature. The simple increment function from your example can be done like this (not tested):

Value Fun(const Vector<Value>& arg, const Renderer *)
{
	if(arg.GetCount() != 1 && !IsNumber(arg[0]))
		return "ERROR";
	return (int)arg[0] + 1;
}

INITBLOCK {
	Compiler::Register("fun", Fun);
};

This code should be placed in .icpp file, to make sure it is linked correctly. Now you can call the function in witz using $fun(MYVAR), it does not have to be passed to the Http.

Is that clearer now? Further examples can be found in Skylark/StdLib.icpp.

Best regards,
Honza

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