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autoload
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  2. autoload
    1. Description
    2. Author
    3. Requirements
    4. Documentation
    5. Examples
    6. License

Description

Load modules lazily.

Author

Alex Shinn

Requirements

None

Documentation

Provides an Emacs-style autoload facility which takes the basic form

[syntax] (autoload unit procedure-name ...)

such that the first time procedure-name is called, it will perform a runtime require of 'unit and then apply the procedure from the newly loaded unit to the args it was passed. Subsequent calls to procedure-name will thereafter refer to the new procedure and will thus not incur any overhead.

You may also specify an alias for the procedure, and a default procedure if the library can't be loaded:

[syntax] (autoload unit (name alias default) ...)

In this case, although the procedure name from the unit is name, the form defines the autoload procedure as alias.

If the library can't be loaded then an error is signalled, unless default is given, in which case the values are passed to that.

Examples

 
;; load iconv procedures lazily
(autoload iconv iconv iconv-open)
;; load some sqlite procedures lazily with "-" names
(autoload sqlite (sqlite:open sqlite-open)
                 (sqlite:execute sqlite-execute))
;; load md5 library, falling back on slower scheme version
(autoload scheme-md5 (md5:digest scheme-md5:digest))
(autoload md5 (md5:digest #f scheme-md5:digest))

License

 
 Copyright (c) 2004-2005, Alex Shinn
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
 conditions are met:
 
   Redistributions of source code must retain the above copyright notice, this list of conditions and the following
     disclaimer. 
   Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
     disclaimer in the documentation and/or other materials provided with the distribution. 
   Neither the name of the author nor the names of its contributors may be used to endorse or promote
     products derived from this software without specific prior written permission. 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGE.