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INFO-DIR-SECTION The Algorithmic Language Scheme
START-INFO-DIR-ENTRY
* srfi-45.egg: (srfi-45.egg).		Primitives for Expressing Iterative Lazy Algorithms
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srfi-45 egg
***********

Primitives for Expressing Iterative Lazy Algorithms

Written by Kon Lovett (mailto:klovett@pacbell.net)

   This manual corresponds to version 1.0 of the srfi-45 extension
library for Chicken Scheme.

* Menu:

* About this egg::
* Documentation::
* License::
* Index::


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1 About this egg
****************

* Menu:

* Version history::
* Usage::
* Requirements::


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1.1 Version history
===================

`1.0'
     Initial release


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1.2 Usage
=========

Load this egg like so:

   `(require-extension srfi-45)'


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1.3 Requirements
================

This egg requires the following extensions:

   `box.egg'


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2 Documentation
***************

Extends the interpretation of a promise to include lazy 			and
eager promises. Unlike the reference implementation this
version does not redefine 'delay'.

   For more information see SRFI-45
(http://srfi.schemers.org/srfi-45/srfi-45.html).

 -- macro: delay
          (delay EXPRESSION)

     Returns a promise, a delayed evaluation of `EXPRESSION'.

     Note that 'delay' is _not_ re-defined here.  				Mentioned only for
     completeness.

 -- macro: lazy
          (lazy EXPRESSION)

     Returns a promise for `EXPRESSION'.

     The promise will be iteratively forced, overwriting the
     promise at each step before the next iteration, so as to avoid
     storage leaks.

 -- macro: eager
          (eager EXPRESSION)

     Returns a promise but immediately evaluates `EXPRESSION'.

     Not much of a promise, more of a boxed value. For exposition
     purposes in algorithms.

 -- procedure: force
          (force OBJECT)

     Assuming the `OBJECT' is some kind of promise, 				returns the result
     of the delayed evaluation.

 -- procedure: standard-force
          (standard-force OBJECT)

     Assuming the `OBJECT' is a standard promise, 				returns the result of
     the delayed evaluation.

     The R5RS 'force'.

 -- procedure: promise?
          (promise? OBJECT)

     Some kind of promise?

 -- procedure: standard-promise?
          (standard-promise? OBJECT)

     The R5RS 'promise?'

 -- procedure: recursive-promise?
          (recursive-promise? OBJECT)

     Recursive promise?

 -- procedure: lazy-promise?
          (lazy-promise? OBJECT)

     Lazy recursive promise?

 -- procedure: eager-promise?
          (eager-promise? OBJECT)

     Eager recursive promise?

   This egg is *unsafe*!


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3 License
*********


Copyright (c) 2006, Kon Lovett.  All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the Software),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED ASIS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Does not supersede any restrictions in the source.


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Index
*****

 [index ]
* Menu:

* delay:                                 Documentation.        (line 14)
* eager:                                 Documentation.        (line 31)
* eager-promise?:                        Documentation.        (line 73)
* force:                                 Documentation.        (line 39)
* lazy:                                  Documentation.        (line 22)
* lazy-promise?:                         Documentation.        (line 68)
* promise?:                              Documentation.        (line 53)
* recursive-promise?:                    Documentation.        (line 63)
* standard-force:                        Documentation.        (line 45)
* standard-promise?:                     Documentation.        (line 58)



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Node: Version history811
Node: Usage965
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Node: Documentation1326
Node: License3186
Node: Index4422

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