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Change in eval-after-load; advise not using it.

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Richard M. Stallman 1995-03-03 06:49:59 +00:00
parent 4d9bd66423
commit d2e9ee068c
1 changed files with 14 additions and 1 deletions
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15
lispref/loading.texi
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@ -583,7 +583,8 @@ loaded, by calling @code{eval-after-load}.
@defun eval-after-load library form
This function arranges to evaluate @var{form} at the end of loading the
library @var{library}, if and when @var{library} is loaded.
library @var{library}, if and when @var{library} is loaded. If
@var{library} is already loaded, it evaluates @var{form} right away.
The library name @var{library} must exactly match the argument of
@code{load}. To get the proper results when an installed library is
@ -594,6 +595,18 @@ An error in @var{form} does not undo the load, but does prevent
execution of the rest of @var{form}.
@end defun
In general, well-designed Lisp programs should not use this feature.
The clean and modular ways to interact with a Lisp library are (1)
examine and set the library's variables (those which are meant for
outside use), and and (2) call the library's functions. If you wish to
do (1), you can do it immediately---there is no need to wait for when
the library is loaded. To do (2), you must load the library (preferably
with @code{require}).
But it is to use @code{eval-after-load} in your personal customizations
if you don't feel they must meet the design standards of programs to be
released.
@defvar after-load-alist
An alist of expressions to evaluate if and when particular libraries are
loaded. Each element looks like this: