Oxygen Basic

Programming => Example Code => General => Topic started by: Charles Pegge on October 22, 2014, 09:38:48 PM

Title: Passing data directly to a function
Post by: Charles Pegge on October 22, 2014, 09:38:48 PM

By using a macro which creates a scoped array in which to pass the data.


DataCall fun points( {"one",1,2,3},{"two",2,4,6} )

def DataCall
  '%1 function name
  '%2 variable type
  '%3 data
  scope
    %2 d = { %3 }
    %1 d, countof d
  end scope
end def

Code: [Select]


include "$/inc/console.inc"
'indexbase 0

def DataCall
  '%1 function name
  '%2 variable type
  '%3 data
  scope
    %2 d = { %3 }
    %1 d, countof d
  end scope
end def


type points
  string name
  double x,y,z
end type

function fun(Points*d, sys n)
  for i=1 to n
   printl d[i].name tab d[i].x tab d[i].y tab d[i].z
  next
end function

'scope
'Points d= { {"one",1,2,3},{"two",2,4,6} } : fun d, countof d
'end scope

'using the macro:
DataCall fun points( {"one",1,2,3},{"two",2,4,6} )


waitkey


Title: Re: Passing data directly to a function
Post by: Mike Lobanovsky on October 23, 2014, 08:06:03 AM

Nice find, Charles.

In FBSL, braces define an anonymous (i.e. nameless) array of temp Variant vars, and such function calls are possible without the use of a macro or UDT definition. The array would provide the usual LBound(), UBound() and Count() functionality, and GetType() would supply the type info about the array's constituent elements:

Code: [Select]

Sub Foo(a = {}, b = {})
  If Count(a) Then Print a[0]
  If UBound(b) Then Print b[0] + b[1]
End Sub

Foo({!1, !!2, %3, %%4, "five"}) // will print 1.000000 only, won't print anything for b[]
It's great to see minds working in parallel. Perhaps that's exactly why I came here, if anyone wondered. :)

Title: Re: Passing data directly to a function
Post by: Charles Pegge on October 23, 2014, 09:22:55 AM

Hi Mike,

Yes, that highlights the difference in statefulness between compiler and interpreter. Oxygen might benefit from a standard array object, and set of macros to manage data input, multidimensioning, redimesioning, UBOUND & LBOUND.

There are classes called StringArray and TextArray in inc/StringUtil.inc which can be deployed for line-based text. They do not depend on fixed-length arrays.