27
edits
Changes
Jump to navigation
Jump to search
m
System Macros/Branches and Decisions (view source)
Revision as of 10:05, 18 October 2008
, 10:05, 18 October 2008→<cmd>doifundefined</cmd>, <cmd>doifdefined</cmd>, etc.: typo
===<cmd>doifundefined</cmd>, <cmd>doifdefined</cmd>, etc.===
The standard way of testing if a macro is defined is comparing its meaning with another undefined one, aptly named <code>\undefined</code>. To garantee guarantee correct working of this set of macros, <code>\undefined</code> may '''never''' be defined by a user!
<texcode>
