Filter::Util::Exec - exec source filter
This module is provides the interface to allow the creation of Source Filters which use a Unix coprocess.
filter_add installs a filter. It takes one parameter which should be a reference. The kind of reference used will dictate which of the two filter types will be used.
If a CODE reference is used then a closure filter will be assumed.
If a CODE reference is not used, a method filter will be assumed. In a method filter, the reference can be used to store context information. The reference will be blessed into the package by
See Filter::Util::Call for examples of using context information using both method filters and closure filters.
11th December 1995.