| 1 | const std = @import("std"); |
| 2 | const string = []const u8; |
| 3 | const extras = @import("./lib.zig"); |
| 4 | const expectSimilarType = extras.expectSimilarType; |
| 5 | |
| 6 | pub fn ReverseFields(comptime T: type) type { |
| 7 | const info = @typeInfo(T).@"struct"; |
| 8 | const len = info.fields.len; |
| 9 | var names: [len][]const u8 = undefined; |
| 10 | var types: [len]type = undefined; |
| 11 | for (0..len) |i| { |
| 12 | names[i] = info.fields[len - 1 - i].name; |
| 13 | types[i] = info.fields[len - 1 - i].type; |
| 14 | } |
| 15 | return @Struct(info.layout, null, &names, &types, &@splat(.{})); |
| 16 | } |
| 17 | |
| 18 | test { |
| 19 | try expectSimilarType( |
| 20 | ReverseFields(struct { |
| 21 | x: u8, |
| 22 | y: u16, |
| 23 | }), |
| 24 | struct { |
| 25 | y: u16, |
| 26 | x: u8, |
| 27 | }, |
| 28 | ); |
| 29 | } |