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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2022 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
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
/// A C++ type that can be converted to a Swift collection.
public protocol CxxConvertibleToCollection<Element> {
associatedtype Element
associatedtype RawIterator: UnsafeCxxInputIterator
where RawIterator.Pointee == Element
/// Do not implement this function manually in Swift.
func __beginUnsafe() -> RawIterator
/// Do not implement this function manually in Swift.
func __endUnsafe() -> RawIterator
}
extension CxxConvertibleToCollection {
@inlinable
public func forEach(_ body: (RawIterator.Pointee) throws -> Void) rethrows {
var rawIterator = __beginUnsafe()
let endIterator = __endUnsafe()
while rawIterator != endIterator {
try body(rawIterator.pointee)
rawIterator = rawIterator.successor()
}
}
}
// Break the ambiguity between Sequence.forEach and CxxConvertibleToCollection.forEach.
extension CxxConvertibleToCollection where Self: Sequence {
@inlinable
public func forEach(_ body: (Element) throws -> Void) rethrows {
for element in self {
try body(element)
}
}
}
extension RangeReplaceableCollection {
/// Creates a collection containing the elements of a C++ container.
///
/// This initializes the collection by copying every element of the C++
/// container.
///
/// - Complexity: O(*n*), where *n* is the number of elements in the C++
/// container when each element is copied in O(1). Note that this might not
/// be true for certain C++ types, e.g. those with a custom copy
/// constructor that performs additional logic.
@inlinable
public init<C: CxxConvertibleToCollection>(_ elements: __shared C)
where C.RawIterator.Pointee == Element {
self.init()
elements.forEach { self.append($0) }
}
}
extension SetAlgebra {
/// Creates a set containing the elements of a C++ container.
///
/// This initializes the set by copying every element of the C++ container.
///
/// - Complexity: O(*n*), where *n* is the number of elements in the C++
/// container when each element is copied in O(1). Note that this might not
/// be true for certain C++ types, e.g. those with a custom copy
/// constructor that performs additional logic.
@inlinable
public init<C: CxxConvertibleToCollection>(_ elements: __shared C)
where C.RawIterator.Pointee == Element {
self.init()
elements.forEach { self.insert($0) }
}
}
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