XLISP *applyhook*

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# *applyhook*

Type: | - | system variable
Source: | - | xlglob.c (not implemented)

## Syntax

*applyhook*

## Description

*applyhook* is a system variable that exists and is initialized to NIL. It is a hook that is intended to contain a user function that is to be called whenever a function is applied to a list of arguments. It is not, however, implemented in XLISP 2.0, it only exists as a dummy hook.

## Examples

    *applyhook*  => NIL

*applyhook* is often used to implement function stepping functionality in a debugger.

See also:

- Symbols
- Evaluation Functions

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Nyquist / XLISP 2.0 - Contents | Tutorials | Examples | Reference