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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
// This file is for internal use of FoundationNetworking
#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
import SwiftFoundation
#else
import Foundation
#endif
/// A class type which acts as a handle (pointer-to-pointer) to a Foundation reference type which has only a mutable class (e.g., NSURLComponents).
///
/// Note: This assumes that the result of calling copy() is mutable. The documentation says that classes which do not have a mutable/immutable distinction should just adopt NSCopying instead of NSMutableCopying.
internal final class _MutableHandle<MutableType : NSObject> : @unchecked Sendable where MutableType : NSCopying {
@usableFromInline internal var _pointer : MutableType
init(reference : MutableType) {
_pointer = reference.copy() as! MutableType
}
init(adoptingReference reference: MutableType) {
_pointer = reference
}
/// Apply a closure to the reference type.
func map<ReturnType>(_ whatToDo : (MutableType) throws -> ReturnType) rethrows -> ReturnType {
return try whatToDo(_pointer)
}
func _copiedReference() -> MutableType {
return _pointer.copy() as! MutableType
}
func _uncopiedReference() -> MutableType {
return _pointer
}
}
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