# Filter::Util::Exec - phpMan

## NAME
    [Filter::Util::Exec] - exec source filter

## SYNOPSIS
        use [Filter::Util::Exec];

## DESCRIPTION
    This module is provides the interface to allow the creation of *Source
    Filters* which use a Unix coprocess.

    See [Filter::exec], [Filter::cpp] and [Filter::sh] for examples of the use of
    this module.

    Note that the size of the buffers is limited to 32-bit.

  filter_add()
    The function, "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 "filter_add".

    See [Filter::Util::Call] for examples of using context information using
    both *method filters* and *closure filters*.

## AUTHOR
    Paul Marquess

## DATE
    11th December 1995.