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memoize lazy parameter evaluation #17686

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dlangBugzillaToGithub opened this issue Oct 21, 2014 · 0 comments
Open

memoize lazy parameter evaluation #17686

dlangBugzillaToGithub opened this issue Oct 21, 2014 · 0 comments

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@dlangBugzillaToGithub
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Martin Nowak (@MartinNowak) reported this on 2014-10-21T10:56:54Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=13643

Description

Currently D's lazy parameters use call-by-name, i.e. the expression is evaluated whenever referenced. Historically lazy refers to call-by-need evaluation where the result is cached on first use.
http://en.wikipedia.org/wiki/Evaluation_strategy#Call_by_name

We could at least do it for pure expressions that are referenced multiple times.
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