46 lines
1.1 KiB
Plaintext
46 lines
1.1 KiB
Plaintext
import "@std/meta"
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EnumMap func($E, $V type) type {
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match typeinfo!(E) {
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.enum |info|: return struct {
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present [info.fields.len]mut bool # fixme: replace with bitset
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values [info.fields.len]mut V
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}
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else: compile_error!("EnumMap key must be an enum")
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}
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}
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init func(
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$E, $V type,
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values meta.EnumFieldStruct(E, ?V, some!(null)),
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) EnumMap(E, V) {
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map EnumMap(E, V) = undefined
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match typeinfo!(E) {
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.enum |info|: expand for info.fields |field, i| {
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map.present[i] = false
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if field!(values, field.name) |value| {
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map.present[i] = true
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map.values[i] = value
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}
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}
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else: compile_error!("EnumMap key must be an enum")
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}
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return map
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}
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get func($E, $V type, map @EnumMap(E, V), key E) ?V {
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# fixme: linear lookup; implement an enum index/discriminant map for O(1) lookup
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match typeinfo!(E) {
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.enum |info|: expand for info.fields |field, i| {
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if key == field!(E, field.name) {
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if (map.present[i]) return map.values[i]
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return null
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}
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}
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else: compile_error!("EnumMap key must be an enum")
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}
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}
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