| 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 StructOfArrays(len: usize, T: type) type { |
| 7 | const info = @typeInfo(T).@"struct"; |
| 8 | const fields = info.fields; |
| 9 | var names: [fields.len][]const u8 = undefined; |
| 10 | var types: [fields.len]type = undefined; |
| 11 | var attrs: [fields.len]std.builtin.Type.StructField.Attributes = undefined; |
| 12 | for (fields, 0..) |item, i| { |
| 13 | names[i] = item.name; |
| 14 | types[i] = [len]item.type; |
| 15 | attrs[i] = .{ |
| 16 | .@"comptime" = item.is_comptime, |
| 17 | .@"align" = item.alignment, |
| 18 | .default_value_ptr = item.default_value_ptr, |
| 19 | }; |
| 20 | } |
| 21 | if (info.is_tuple) return @Tuple(&types); |
| 22 | return @Struct(.auto, null, &names, &types, &attrs); |
| 23 | } |
| 24 | |
| 25 | test { |
| 26 | try expectSimilarType( |
| 27 | StructOfArrays(10, struct { |
| 28 | x: u8, |
| 29 | y: u16, |
| 30 | }), |
| 31 | struct { |
| 32 | x: [10]u8, |
| 33 | y: [10]u16, |
| 34 | }, |
| 35 | ); |
| 36 | } |