diff options
Diffstat (limited to 'core/math')
| -rw-r--r-- | core/math/rand/rand.odin | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/core/math/rand/rand.odin b/core/math/rand/rand.odin index 14894e82c..560dc8379 100644 --- a/core/math/rand/rand.odin +++ b/core/math/rand/rand.odin @@ -834,3 +834,23 @@ choice :: proc(array: $T/[]$E, r: ^Rand = nil) -> (res: E) { } return array[int63_max(n, r)] } + + +@(require_results) +choice_enum :: proc($T: typeid, r: ^Rand = nil) -> T + where + intrinsics.type_is_enum(T), + size_of(T) <= 8, + len(T) == cap(T) /* Only allow contiguous enum types */ +{ + when intrinsics.type_is_unsigned(intrinsics.type_core_type(T)) && + u64(max(T)) > u64(max(i64)) { + i := uint64(r) % u64(len(T)) + i += u64(min(T)) + return T(i) + } else { + i := int63_max(i64(len(T)), r) + i += i64(min(T)) + return T(i) + } +}
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