| cue eval -c structs.cue |
| cmp stdout expect-stdout-cue |
| |
| -- frontmatter.toml -- |
| title = "Structs" |
| description = "" |
| |
| -- text.md -- |
| Struct is the most important composite type in CUE. |
| It's members are called fields. |
| |
| A struct field may be optional. |
| One can use an optional field to indicate what the type should be if it were |
| specified. |
| A regular (or required) field, on the other hand, must be made concrete |
| for a configuration to be converted to, say, JSON. |
| |
| It is okay for an optional field to be bottom (`_|_`). |
| This just means that field may not be specified. |
| |
| -- structs.cue -- |
| #a: { |
| foo?: int |
| bar?: string |
| baz?: string |
| } |
| b: #a & { |
| foo: 3 |
| baz?: 2 // baz?: _|_ |
| } |
| |
| -- expect-stdout-cue -- |
| b: { |
| foo: 3 |
| } |
