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Article:
  Extending Ruby with C
Subject:   Use rb_scan_args()
Date:   2004-11-19 15:40:58
From:   djberg96
You should do manual argument counting in variable length argument lists. Use rb_scan_args() instead. In writer_begin_element() for example, it should look like this:


static VALUE

writer_begin_element (int argc, VALUE *argv, VALUE self)

{

  genxWriter w;

  VALUE rbName, rbXmlns;

  

  /* One mandatory, one optional argument */

  rb_scan_args(argc,argv,"11",&rbName,&rbXmlns);

          

  Check_Type(rbName,T_STRING);

  if(Qnil != rbXmlns)

      Check_Type(rbXmlns,T_STRING);

  ...

The front end API would then be:


Genx::Writer#begin_element(name,namespace=nil)


This is more concise, and less prone to error than checking argc manually.
Full Threads Oldest First

Showing messages 1 through 2 of 2.

  • Use rb_scan_args()
    2004-11-19 15:44:38  rooneg [View]

    Thanks for the pointer, when I get a chance I'll make those changes to the current version of GenX4r.
  • Use rb_scan_args()
    2004-11-19 15:44:27  djberg96 [View]

    You should NOT do ...

    Give me a preview button!