Procedure Parameters

[akee]

Self-explanatory. This would be so helpful in development.

Code: Select all

CountProcedureParameter()
ProcedureParameter( ByIndex )
ProcedureParameter( ByName$ )

[jacdelad]

What would be the advantage?

[Quin]

Yeah, PB (very unfortunately) doesn't have varargs or anything similar, so what would the use case for this be?

[akee]

What would be the advantage?

This would be one.

https://www.purebasic.fr/english/viewtopic.php?t=83339

[STARGÅTE]

Self-explanatory. This would be so helpful in development.

Code: Select all

CountProcedureParameter()
ProcedureParameter( ByIndex )
ProcedureParameter( ByName$ )

Not really "Self-explanatory". Are these function compiler functions like SizeOf() or Defined() or runtime functions?
If CountProcedureParameter() is a compiler function, it whould return always the number of parameters defined in the procedure definition (with all additional optional arguments). However, if CountProcedureParameter() would be a runtime function, it would also give the number of all arguments, because in PureBasic there is no difference if an optional argument is passed or not.

Code: Select all

Procedure Test(A.i, B.i=-1)
	ProcedureReturn CountProcedureParameter()
EndProcedure

Debug Test(7, 8)    ; Would return 2, because two parameter are passed.
Debug Test(7)       ; Would return 2 as well, because this line is called as Test(2, -1)
Debug Test(7, 8, 9) ; Would raise an error, because not all arguments are defined.

Even, if the compiler would ignore such limitation, how the compiler should know the argument type (integer, double, string) and handle the return type of ProcedureParameter(ByIndex) or ProcedureParameter(ByName$)?

In the core of PureBasic, such a wish cannot be fulfilled.

[DarkDragon]

I guess he/she/they/... just wants varargs and showed one solution how it could look like, not explicitly wanting exactly these functions. That's at least what I guess from his/her/their/... last post here.

[juergenkulow]

Would you like to have a variable argument list like in C?

[STARGÅTE]

From the author's title and article it is not obvious that he wants procedures with arbitrary number of arguments.

I thought, ProcedureParameter() is similar to GetRuntimeInteger() or GetRuntimeString() from the Runtime library, just for procedure's arguments.

[DarkDragon]

From the author's title and article it is not obvious that he wants procedures with arbitrary number of arguments.

I thought, ProcedureParameter() is similar to GetRuntimeInteger() or GetRuntimeString() from the Runtime library, just for procedure's arguments.

Indeed, it wasn't clear to me either, until we got this, because it essentially ignores all the other information he/she/they/... got by all previous posts and points to the use case of variadic arguments.

What would be the advantage?

This would be one.

https://www.purebasic.fr/english/viewtopic.php?t=83339

[akee]

Yes, similar to this: https://cplusplus.com/reference/cstdarg/va_arg/

but in PureBasic.