UnderscoreOpDispatcher

1 {
2     struct Foo
3     {
4         int _i;
5         string _s;
6         bool _b;
7         string[] _add;
8         alias wordList = _add;
9 
10         mixin UnderscoreOpDispatcher;
11     }
12 
13     Foo f;
14     f.i = 42;         // f.opDispatch!"i"(42);
15     f.s = "hello";    // f.opDispatch!"s"("hello");
16     f.b = true;       // f.opDispatch!"b"(true);
17     f.add("hello");   // f.opDispatch!"add"("hello");
18     f.add("world");   // f.opDispatch!"add"("world");
19 
20     assert(f.i == 42);
21     assert(f.s == "hello");
22     assert(f.b);
23     assert(f.wordList == [ "hello", "world" ]);
24 
25     // ref auto allows this
26     ++f.i;
27     assert(f.i == 43);
28 
29     /+
30         Returns `this` by reference, so we can chain calls.
31      +/
32     auto f2 = Foo()
33         .i(9001)
34         .s("world")
35         .b(false)
36         .add("hello")
37         .add("world");
38 
39     assert(f2.i == 9001);
40     assert(f2.s == "world");
41     assert(!f2.b);
42     assert(f2.wordList == [ "hello", "world" ]);
43 }
44 {
45     struct Bar
46     {
47         string[string] _aa;
48 
49         mixin UnderscoreOpDispatcher;
50     }
51 
52     Bar bar;
53     bar.aa = [ "hello" : "world" ];
54     bar.aa = [ "foo" : "bar" ];
55     assert(bar.aa == [ "hello" : "world", "foo" : "bar"]);
56 }