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  1. import std.stdio;
  2. class Foo {
  3.   int a;
  4.   int opApply(scope int delegate(ref int) dg)const
  5.   {
  6.     auto r = dg(a); // なんで渡せるの？
  7.     if (r) return r;
  8.     return 0;
  9.   }
  10. }
  11. class Bar {
  12.   Foo foo;
  13.   this(){ foo = new Foo; }
  14.   void hoge() const
  15.   {
  16.     writeln(foo.a);
  17.     // なんでforeachbodyがconstじゃないdelegateで渡せちゃうの？
  18.     foreach(ref fuga; foo){
  19.       fuga = 1;
  20.     }
  21.     // なんで書き換えられちゃってるの？
  22.     writeln(foo.a);
  23.   }
  24. }
  25. void main() {
  26.   (new Bar()).hoge();
  27. }
Success #stdin #stdout 0.01s 2120KB
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https://ideone.com/GRfxw
language:
D (dmd 2.085.0)
created:
14 years ago
visibility:
public

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