(m4.info) Indir

 
 Indirect call of macros
 =======================
 
    Any macro can be called indirectly with `indir':
 
      indir(NAME, ...)
 
 which results in a call to the macro NAME, which is passed the rest of
 the arguments.  This can be used to call macros with "illegal" names
 (`define' allows such names to be defined):
 
      define(`$$internal$macro', `Internal macro (name `$0')')
      =>
      $$internal$macro
      =>$$internal$macro
      indir(`$$internal$macro')
      =>Internal macro (name $$internal$macro)
 
    The point is, here, that larger macro packages can have private
 macros defined, that will not be called by accident.  They can *only* be
 called through the builtin `indir'.

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