Difference between revisions of "Talk:Performance/Strictness"
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+ | I removed the following: |
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+ | <blockquote>NB. do not do this if the expression on the right of $! is a variable - that just wastes effort, because it does not eliminate a suspension. The only reason to do this would be if you were eliminating a space leak.</blockquote> |
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+ | because |
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+ | <pre-haskell> |
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+ | test = let |
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+ | x = undefined |
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+ | in (const 0) $! x |
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+ | </pre-haskell> |
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+ | yields exception and substituting ($) for ($!) yields 0. So ($!) does eliminate a suspension. |
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+ | --[[User:Beroal|beroal]] 16:58, 16 June 2010 (UTC) |
Latest revision as of 16:58, 16 June 2010
I removed the following:
NB. do not do this if the expression on the right of $! is a variable - that just wastes effort, because it does not eliminate a suspension. The only reason to do this would be if you were eliminating a space leak.
because <pre-haskell> test = let
x = undefined in (const 0) $! x
</pre-haskell> yields exception and substituting ($) for ($!) yields 0. So ($!) does eliminate a suspension. --beroal 16:58, 16 June 2010 (UTC)