Re: [NTG-context] What's the difference between \dodoubleargument and \dodoubleempty?

21 Oct 2008


      Hans Hagen  writes:
...
Ruini Xue wrote:
...
It's difficult to understand them from the code.
the first one issues a warning when no argument is given
You mean both of them ask the following \command to take two mandatory 
arguments? I try this example:

======================================
\def\test
  {\dodoubleargument\dotest} % use \dodoubleempty

\def\dotest[#1][#2]
 {\iffirstargument
   First arg: #1
  \fi
  \ifsecondargument
   Second arg: #2
  \fi}

\test[ok][ok] % 1. this is ok

\test [ok] [] % 2. warning?

\test [wrong] % 3. Error: lack one arg
==================================

both 1 and 2 can print "First arg" and "Second arg", so I am confused what's 
"no argument is given"

-- ruini