| Quellcodebibliothek Statistik Leitseite products/sources/formale Sprachen/GAP/pkg/datastructures/doc/ (Algebra von RWTH Aachen Version 4.15.1©) Datei vom 14.9.2025 mit Größe 1 kB |
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<!-- This is an automatically generated file. --> <Chapter Label="Chapter_Memoisation"> <Heading>Memoisation</Heading> <P/> <Package>datastructures</Package> provides simple ways to cache return values of pure function <P/> <Section Label="Chapter_Memoisation_Section_Memoisation_with_HashMap"> <Heading>Memoisation with HashMap</Heading> <P/> <ManSection> <Func Arg="function [, options]" Name="MemoizeFunction" /> <Returns>A function </Returns> <Description> <C>MemoizeFunction</C> returns a function which behaves the same as <A>function</A>, except that it caches the return value of <A>function</A>. The cache can be flushed by calling <Ref Func="FlushCaches" BookName="ref"/>. <P/> This function does not promise to never call <A>function</A> more than once for any input -- values may be removed if the cache gets too large, or GAP chooses to flush all caches, or if multiple threads try to calculate the same value simultaneously. <P/> The optional second argument is a record which provides a number of configuration options. The following options are supported. <List> <Mark><C>flush</C> (default <K>true</K>)</Mark> <Item> If this is <K>true</K>, the cache is emptied whenever <Ref Func="FlushCaches" BookName="ref"/> is called. </Item> <Mark><C>contract</C> (defaults to <Ref Func="ReturnTrue" BookName="ref"/>)</Mark> <Item> A function that is called on the arguments given to <A>function</A>. If this function returns <K>false</K>, then <C>errorHandler</C> is called. </Item> <Mark><C>errorHandler</C> (defaults to none)</Mark> <Item> A function to be called when an input that does not fulfil <C>contract</C> is passed to the cache. </Item> </List> <P/> </Description> </ManSection> </Section> </Chapter> ¤ Dauer der Verarbeitung: 0.30 Sekunden (vorverarbeitet) ¤*© Formatika GbR, Deutschland |
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2026-03-28