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[SR-12227] Ambiguous reference to member 'random(in:using:)' for BinaryFloatingPoint protocol #54653

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swift-ci opened this issue Feb 18, 2020 · 2 comments
Closed

[SR-12227] Ambiguous reference to member 'random(in:using:)' for BinaryFloatingPoint protocol #54653

swift-ci opened this issue Feb 18, 2020 · 2 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella

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@swift-ci
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Previous ID SR-12227
Radar None
Original Reporter difomiry (JIRA User)
Type Bug
Status Closed
Resolution Done
Environment

Apple Swift version 5.1.3 (swiftlang-1100.0.282.1 clang-1100.0.33.15)
Target: x86_64-apple-darwin19.0.0

Additional Detail from JIRA
Votes 0
Component/s Standard Library
Labels Bug
Assignee None
Priority Medium

md5: 03afcbc561a4fbcb12abaf1969d8399b

Issue Description:

My code:

extension Collection where Element: BinaryFloatingPoint {
  var random: Element {
    Element.random(in: 0...1)
  }
}

Log:

/tmp/42407C3B-C2C5-4563-A7C1-8EE429F26D38.53repj/main.swift:5:5: error: ambiguous reference to member 'random(in:using:)'
    Element.random(in: 0...1)
    ^~~~~~~
Swift.BinaryFloatingPoint:5:35: note: found this candidate
    @inlinable public static func random<T>(in range: Range<Self>, using generator: inout T) -> Self where T : RandomNumberGenerator
                                  ^
Swift.BinaryFloatingPoint:6:35: note: found this candidate
    @inlinable public static func random(in range: Range<Self>) -> Self
                                  ^
Swift.BinaryFloatingPoint:7:35: note: found this candidate
    @inlinable public static func random<T>(in range: ClosedRange<Self>, using generator: inout T) -> Self where T : RandomNumberGenerator
                                  ^
Swift.BinaryFloatingPoint:8:35: note: found this candidate
    @inlinable public static func random(in range: ClosedRange<Self>) -> Self

Related issues:
https://bugs.swift.org/browse/SR-8156
#17716
#17766
@swift-ci
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Comment by Dmitry Fomin (JIRA)

I found solution. You need to add "Element.RawSignificand: FixedWidthInteger" constraint:

extension Collection where Element: BinaryFloatingPoint, Element.RawSignificand: FixedWidthInteger {
  var random: Element {
    Element.random(in: 0...1)
  }
}

@hborla
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hborla commented Feb 21, 2020

@swift-ci create

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella
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@hborla @swift-ci