File: UInt%2Bfirst%20and%20last%20set%20bit.swift.gyb

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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Collections open source project
//
// Copyright (c) 2022 - 2024 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//

%{
  from gyb_utils import *
}%
${autogenerated_warning()}

% for modifier in visibility_levels:
${visibility_boilerplate(modifier)}
extension UInt {
  @inlinable @inline(__always)
  ${modifier} var _firstSetBit: UInt? {
    guard self != 0 else { return nil }
    let v = UInt.bitWidth &- 1 &- self.leadingZeroBitCount
    return UInt(truncatingIfNeeded: v)
  }

  @inlinable @inline(__always)
  ${modifier} var _lastSetBit: UInt? {
    guard self != 0 else { return nil }
    return UInt(truncatingIfNeeded: self.trailingZeroBitCount)
  }
}
% end
${visibility_boilerplate("end")}