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Update demo.odin

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gingerBill
2022-05-23 12:07:44 +01:00
parent 3ec70c5517
commit 7002f0a7d7
1 changed files with 4 additions and 2 deletions
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examples/demo/demo.odin
+4 -2
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@@ -1977,15 +1977,17 @@ constant_literal_expressions :: proc() {
} }
union_maybe :: proc() { union_maybe :: proc() {
fmt.println("\n#union #maybe") fmt.println("\n#union based maybe")
// NOTE: This is already built-in, and this is just a reimplementation to explain the behaviour // NOTE: This is already built-in, and this is just a reimplementation to explain the behaviour
Maybe :: union($T: typeid) #maybe {T} Maybe :: union($T: typeid) {T}
i: Maybe(u8) i: Maybe(u8)
p: Maybe(^u8) // No tag is stored for pointers, nil is the sentinel value p: Maybe(^u8) // No tag is stored for pointers, nil is the sentinel value
// Tag size will be as small as needed for the number of variants
#assert(size_of(i) == size_of(u8) + size_of(u8)) #assert(size_of(i) == size_of(u8) + size_of(u8))
// No need to store a tag here, the `nil` state is shared with the variant's `nil`
#assert(size_of(p) == size_of(^u8)) #assert(size_of(p) == size_of(^u8))
i = 123 i = 123