1const builtin = @import("builtin");
2const expect = @import("std").testing.expect;
3
4const Foo = struct {
5 a: u64 = 10,
6
7 fn one(self: Foo) u64 {
8 return self.a + 1;
9 }
10
11 const two = __two;
12
13 fn __two(self: Foo) u64 {
14 return self.a + 2;
15 }
16
17 const three = __three;
18
19 const four = custom(Foo, 4);
20};
21
22fn __three(self: Foo) u64 {
23 return self.a + 3;
24}
25
26fn custom(comptime T: type, comptime num: u64) fn (T) u64 {
27 return struct {
28 fn function(self: T) u64 {
29 return self.a + num;
30 }
31 }.function;
32}
33
34test "fn delegation" {
35 if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
36 if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
37
38 const foo = Foo{};
39 try expect(foo.one() == 11);
40 try expect(foo.two() == 12);
41 try expect(foo.three() == 13);
42 try expect(foo.four() == 14);
43}