File: FixedWidthInteger%2BroundUpToPowerOfTwo.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 FixedWidthInteger {
  /// Round up `self` to the nearest power of two, assuming it's representable.
  /// Returns 0 if `self` isn't positive.
  @inlinable
  ${modifier} func _roundUpToPowerOfTwo() -> Self {
    guard self > 0 else { return 0 }
    let l = Self.bitWidth - (self &- 1).leadingZeroBitCount
    return 1 << l
  }
}
% end
${visibility_boilerplate("end")}