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Matching against infinity, neg_infinity and nan #6644

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vicuna opened this issue Nov 4, 2014 · 2 comments
Closed

Matching against infinity, neg_infinity and nan #6644

vicuna opened this issue Nov 4, 2014 · 2 comments
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feature-wish language-features wontfix

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@vicuna
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vicuna commented Nov 4, 2014

Original bug ID: 6644
Reporter: bouaziz
Status: resolved (set by @damiendoligez on 2017-03-01T14:09:18Z)
Resolution: won't fix
Priority: normal
Severity: feature
Category: language features

Bug description

Since nan, infinity and neg_infinity are values of Pervasives, there is no way to use them in the lhs of a pattern matching.
One has to use _ = infinity or compare nan _ = 0 or classify_float instead.
@vicuna
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vicuna commented Dec 22, 2014

Comment author: @damiendoligez

Note that it's generally not a good idea to do pattern-matching on floating-point numbers.

@vicuna
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vicuna commented Dec 8, 2016

Comment author: @mshinwell

Should we close this issue? I vote yes, for the reason @doligez mentions.

@vicuna vicuna closed this as completed Mar 1, 2017
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@vicuna