authorgravatar for shawn@git.icuShawn Landden <shawn@git.icu> 2019-05-27 00:35:35-05:00
committergravatar for shawn@git.icuShawn Landden <shawn@git.icu> 2019-05-27 00:38:36-05:00
log5a91dbc16cbe20a95aafb6b3221c4a5a07d9b117
tree1c8fd5542d40d8aea05fff58db57c50dc053e39d
parentd1f9b8184d61674a77424f026adfef2752d1dfdd

allow const to be passed to @hasField()

Actually include the tests I wrote

2 files changed, 31 insertions(+), 1 deletions(-)

doc/langref.html.in+1-1
......@@ -6868,7 +6868,7 @@ fn add(a: i32, b: i32) i32 { return a + b; }
68686868 </p>
68696869 {#header_close#}
68706870 {#header_open|@hasField#}
6871 <pre>{#syntax#}@hasField(comptime T: type, comptime name: []u8) bool{#endsyntax#}</pre>
6871 <pre>{#syntax#}@hasField(comptime T: type, comptime name: []const u8) bool{#endsyntax#}</pre>
68726872 <p>Returns if the field name of a struct, union, or enum exists.</p>
68736873 <p>
68746874 The result is a compile time constant.
test/stage1/behavior/hasfield.zig created+30
......@@ -0,0 +1,30 @@
1const expect = @import("std").testing.expect;
2const builtin = @import("builtin");
3
4test "@hasField" {
5 const struc = struct {
6 a: i32,
7 b: []u8,
8 };
9 expect(@hasField(struc, "a") == true);
10 expect(@hasField(struc, "b") == true);
11 expect(@hasField(struc, "non-existant") == false);
12
13 const unin = union {
14 a: u64,
15 b: []u16,
16 };
17 expect(@hasField(unin, "a") == true);
18 expect(@hasField(unin, "b") == true);
19 expect(@hasField(unin, "non-existant") == false);
20
21 const enm = enum {
22 a,
23 b,
24 };
25 expect(@hasField(enm, "a") == true);
26 expect(@hasField(enm, "b") == true);
27 expect(@hasField(enm, "non-existant") == false);
28
29 expect(@hasField(builtin, "os") == true);
30}