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77 lines
2.7 KiB
Swift
77 lines
2.7 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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/// Returns the lesser of two comparable values.
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///
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/// - Parameters:
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/// - x: A value to compare.
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/// - y: Another value to compare.
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/// - Returns: The lesser of `x` and `y`. If `x` is equal to `y`, returns `x`.
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@inlinable // protocol-only
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public func min<T: Comparable>(_ x: T, _ y: T) -> T {
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// In case `x == y` we pick `x`.
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// This preserves any pre-existing order in case `T` has identity,
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// which is important for e.g. the stability of sorting algorithms.
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// `(min(x, y), max(x, y))` should return `(x, y)` in case `x == y`.
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return y < x ? y : x
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}
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/// Returns the least argument passed.
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///
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/// - Parameters:
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/// - x: A value to compare.
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/// - y: Another value to compare.
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/// - z: A third value to compare.
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/// - rest: Zero or more additional values.
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/// - Returns: The least of all the arguments. If there are multiple equal
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/// least arguments, the result is the first one.
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@inlinable // protocol-only
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public func min<T: Comparable>(_ x: T, _ y: T, _ z: T, _ rest: T...) -> T {
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var minValue = min(min(x, y), z)
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// In case `value == minValue`, we pick `minValue`. See min(_:_:).
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for value in rest where value < minValue {
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minValue = value
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}
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return minValue
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}
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/// Returns the greater of two comparable values.
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///
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/// - Parameters:
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/// - x: A value to compare.
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/// - y: Another value to compare.
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/// - Returns: The greater of `x` and `y`. If `x` is equal to `y`, returns `y`.
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@inlinable // protocol-only
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public func max<T: Comparable>(_ x: T, _ y: T) -> T {
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// In case `x == y`, we pick `y`. See min(_:_:).
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return y >= x ? y : x
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}
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/// Returns the greatest argument passed.
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///
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/// - Parameters:
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/// - x: A value to compare.
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/// - y: Another value to compare.
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/// - z: A third value to compare.
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/// - rest: Zero or more additional values.
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/// - Returns: The greatest of all the arguments. If there are multiple equal
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/// greatest arguments, the result is the last one.
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@inlinable // protocol-only
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public func max<T: Comparable>(_ x: T, _ y: T, _ z: T, _ rest: T...) -> T {
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var maxValue = max(max(x, y), z)
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// In case `value == maxValue`, we pick `value`. See min(_:_:).
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for value in rest where value >= maxValue {
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maxValue = value
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}
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return maxValue
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}
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