Info Catalog
m4: Answers
m4: Improved forloop
17.1 Solution for 'exch'
========================
The 'exch' macro (⇒Arguments) as presented requires clients to
double quote their arguments. A nicer definition, which lets clients
follow the rule of thumb of one level of quoting per level of
parentheses, involves adding quotes in the definition of 'exch', as
follows:
define(`exch', ``$2', `$1'')
=>
define(exch(`expansion text', `macro'))
=>
macro
=>expansion text