How to create a geometry parameter in own function?

[Christoph_H]

Hi,
how to create a geometry parameter in own function?

In this example the parameter „geo“ should be read a string or an integer. How is this possible?
Because the point function can also read a string or an integer.

function vector TEST (string geo or int geo) {

    vector Ret = point(geo,"ABC",10);
    return Ret;

}

Possibility 1: v@R = TEST("op:../wrangler1'');
Possibility 2: v@R = TEST(1);

Edited December 17, 2019 by Christoph_H

[anim]

you can overload your function with both possibilities by creating 2 or more functions with the same name but different artument types, amounts or even different return type

vector TEST (string geo) {
    vector Ret = point(geo,"ABC",10);
    return Ret;
}
vector TEST (int geo) {
    vector Ret = point(geo,"ABC",10);
    return Ret;
}

 

Edited December 16, 2019 by anim

[Christoph_H]

Thanks.
Is this generally the way to solve this possibility during programming?

[anim]

well yes and no, obviously you don't want to keep duplicating your function just to change the type

so you can define your functions using pre-processor macros which can be more compact even though a bit ugly

#define F(TYPE) \
vector TEST(TYPE geo) { \
    vector Ret = point(geo,"ABC",10); \
    return Ret; \
} \

F(int)
F(string)
#undef F

 

[Christoph_H]

Thanks.

I'm wondering a bit, because I can't find the syntax on the corresponding page like this.
https://www.sidefx.com/docs/houdini/vex/vcc.html
 

How can I find that out, except on forums?

Edited December 17, 2019 by Christoph_H

[anim]

as that page mentions: 

Quote

The pre-processor supports many of the usual C Pre-Processor directives

so maybe search web for countless examples of C Pre-Processor directives

 

also have a look here:

$HFS/houdini/vex/include/

for some examples implemented by SESI, one of them is for example subdcurve.h