Created
July 31, 2013 02:52
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checking if Seq() will match any empty sequence-like object or not
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Compiled from "SeqMatch.scala" | |
public final class SeqMatch$ { | |
public static final SeqMatch$ MODULE$; | |
public static {}; | |
Code: | |
0: new #2 // class SeqMatch$ | |
3: invokespecial #12 // Method "<init>":()V | |
6: return | |
public <T extends java/lang/Object> void check(scala.collection.Seq<T>); | |
Code: | |
0: aload_1 | |
1: astore_2 | |
2: getstatic #19 // Field scala/collection/Seq$.MODULE$:Lscala/collection/Seq$; | |
5: aload_2 | |
6: invokevirtual #23 // Method scala/collection/Seq$.unapplySeq:(Lscala/collection/Seq;)Lscala/Some; | |
9: astore_3 | |
10: aload_3 | |
11: invokevirtual #29 // Method scala/Option.isEmpty:()Z | |
14: ifne 57 | |
17: aload_3 | |
18: invokevirtual #33 // Method scala/Option.get:()Ljava/lang/Object; | |
21: ifnull 57 | |
24: aload_3 | |
25: invokevirtual #33 // Method scala/Option.get:()Ljava/lang/Object; | |
28: checkcast #35 // class scala/collection/SeqLike | |
31: iconst_0 | |
32: invokeinterface #39, 2 // InterfaceMethod scala/collection/SeqLike.lengthCompare:(I)I | |
37: iconst_0 | |
38: if_icmpne 57 | |
41: getstatic #44 // Field scala/Predef$.MODULE$:Lscala/Predef$; | |
44: ldc #46 // String foo | |
46: invokevirtual #50 // Method scala/Predef$.println:(Ljava/lang/Object;)V | |
49: getstatic #56 // Field scala/runtime/BoxedUnit.UNIT:Lscala/runtime/BoxedUnit; | |
52: astore 4 | |
54: goto 70 | |
57: getstatic #44 // Field scala/Predef$.MODULE$:Lscala/Predef$; | |
60: ldc #58 // String bar | |
62: invokevirtual #50 // Method scala/Predef$.println:(Ljava/lang/Object;)V | |
65: getstatic #56 // Field scala/runtime/BoxedUnit.UNIT:Lscala/runtime/BoxedUnit; | |
68: astore 4 | |
70: return | |
} |
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object SeqMatch { | |
def check[T](s: Seq[T]): Unit = s match { | |
case Seq() => println("foo") | |
case _ => println("bar") | |
} | |
} |
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