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Add overload of bitSet generator that accepts a bit mask #19

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Merged
x-sheep merged 1 commit into from
Jan 23, 2026
Merged

Add overload of bitSet generator that accepts a bit mask #19

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2 changes: 1 addition & 1 deletion Sources/PropertyBased/Gen+Collection.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -226,6 +226,6 @@ extension Gen where Value: OptionSet & Sendable, Value.RawValue: FixedWidthInteg
/// - Parameter options: The options to choose from.
/// - Returns: A generator of option sets.
public static func optionSet(of options: Value) -> Generator<Value, Shrink.Bitwise<Value.RawValue>> {
Gen<Value.RawValue>.bitSet.map { Value(rawValue: $0 & options.rawValue) }
Gen<Value.RawValue>.bitSet(mask: options.rawValue).map { Value(rawValue: $0) }
}
}
12 changes: 10 additions & 2 deletions Sources/PropertyBased/Gen+Int.swift
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Expand Up @@ -39,9 +39,17 @@ extension Gen where Value: FixedWidthInteger & Sendable {
///
/// The associated shrinker will remove every bit, but will never set bits that are unset in the original value.
@inlinable
public static var bitSet: Generator<Value, Shrink.Bitwise<Value>> {
public static var bitSet: Generator<Value, Shrink.Bitwise<Value>> { bitSet() }

/// Produces a generator of random integers within the given bit mask.
///
/// The associated shrinker will remove every bit, but will never set bits that are unset in the original value.
/// - Parameter mask: The bit mask to apply to each generated value.
/// - Returns: A generator of random values.
@inlinable
public static func bitSet(mask: Value = ~0) -> Generator<Value, Shrink.Bitwise<Value>> {
return .init(
run: { rng in Value.random(in: .min ... .max, using: &rng) },
run: { rng in Value.random(in: .min ... .max, using: &rng) & mask },
shrink: { .init($0) }
)
}
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