[texhax] testing if a control sequence is primitive

[Vafa Khalighi]

Thanks. This is exactly what I was after however this is known as
\ifprimitive in XeTeX.

On Sun, Oct 9, 2011 at 2:36 AM, Philip TAYLOR (Webmaster, Ret'd) <
P.Taylor at rhul.ac.uk> wrote:

>
>
> Vafa Khalighi wrote:
>
>  How can you test if a control sequence is primitive or not?
>>
>
> "undefined" is \ifpdfprimitive \undefined \else not \fi a primitive \par
> "foo" is \ifpdfprimitive \foo  \else not \fi a primitive \par
> "csname" is \ifpdfprimitive \csname  \else not \fi a primitive \par
> \end
>
>
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