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    <p>There is no dedicated pattern-matching feature as powerful as in Haskell or Scala.</p> <p>As you have already figured out, overloading and calling (templated) functions or delegates is a restricted form of pattern matching. You can match on the argument types only.</p> <p>You can pattern match on <em>compile time</em> template arguments. It is not possible to extract an object's contents there either. But you can extract a type's contents.</p> <p>Eg :</p> <pre><code>import std.stdio, std.conv; template match(T...){ enum match = "default case"; } template match(string a : "x", int b : 1, int c){ enum match = "matched 1, b="~to!string(b); } template match(int a, string b, int c : 100){ enum match = "matched 2, b="~b; } template match(T : T[]*[]){ enum match = "matched 3, an array of pointers to an array of "~T.stringof; } void main(){ int a=100; writeln(match!("x",1,5)); // "matched 1, b=1" writeln(match!(12,"str")); // "default case" writeln(match!(12,"str",100)); // "matched 2, b=str" writeln(match!(int*[]*[])); // "matched 3, an array of pointers to an array of int*" //writeln(match!(12,"str",a)); // would be error, because 'a' // is not evaluable during compile time } </code></pre> <p>If you are interested, you may want to have a look at <a href="http://d-programming-language.org/template.html" rel="nofollow">http://d-programming-language.org/template.html</a> .</p> <p>'is' - Expressions are another way to pattern match on types, see</p> <p><a href="http://d-programming-language.org/expression.html" rel="nofollow">http://d-programming-language.org/expression.html</a> (search for "IsExpression").</p>
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