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Describe the meaning of a nil binding.

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Stefan Monnier 2001-10-12 01:33:41 +00:00
parent 0b41c65c36
commit 33a425c45d
1 changed files with 5 additions and 0 deletions
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lispref/keymaps.texi
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@ -131,6 +131,11 @@ compact way to record lots of bindings. A keymap with such a vector is
called a @dfn{full keymap}. Other keymaps are called @dfn{sparse
keymaps}.
A @code{nil} binding is used to mean that a key is explicitly not bound.
Just like any other binding, it takes precedence over a default binding
or a binding in the parent keymap, but on the other hand, it does not
take precedence over keymaps of lower priority.
When a keymap contains a vector, it always defines a binding for each
@sc{ascii} character, even if the vector contains @code{nil} for that
character. Such a binding of @code{nil} overrides any default key