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PO
primarykey
Id
6317498
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2011-06-11T17:38:11.953
FavoriteCount
0
LastActivityDate
2013-12-15T00:05:10.060
LastEditDate
2013-12-15T00:05:10.060
LastEditorUserId
759866
OwnerUserId
56165
ParentId
6315882
PostTypeId
2
Score
8
ViewCount
0
LastEditorDisplayName
text
Body
No pattern matching as known from Haskell is built in into language, but D has very generic compile time and reflection capabilities that will allow you to match type and their structure in library. For matching runtime values you can use only ordinary <code>if</code> / <code>switch</code> ... constructs; <a href="http://d-programming-language.org/lazy-evaluation.html" rel="nofollow">lazy evaluation of function arguments</a> might also help with implementation of some matching-at-runtime techniques. <a href="http://d-programming-language.org/template.html#Constraint" rel="nofollow">Template Constraints</a> will allow you to create function (template) overloads based on any expression evaluated at compile time (D allows you to execute almost all normal code during compilation). You can also use <code>static if</code> for similar effect. This will practically allow you to match type structure. This is also commonly used technique in D. You might find code of <a href="https://github.com/D-Programming-Language/phobos/blob/master/std/algorithm.d" rel="nofollow">std.algorithm</a> interesting, look for isInputRange and similar functions - they perform matching on type structure - they restrict type of argument to be of certain typeclass Some directions for compile time reflection: <ul> <li><a href="http://d-programming-language.org/expression.html#IsExpression" rel="nofollow">Is Expression</a></li> <li><a href="http://d-programming-language.org/traits.html" rel="nofollow">Traits</a></li> <li><a href="http://d-programming-language.org/phobos/std_traits.html" rel="nofollow">std.traits</a></li> </ul>
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1. POpattern matching in D
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1. PTAnswer
UserLastEditorUserId
1. USBenjamin
UserOwnerUserId
1. USMichal Minich
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1. POpattern matching in D
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