0001    //
0002    //  LockProtected.swift
0003    //  ReadWriteLock
0004    //
0005    //  Created by John Gallagher on 7/17/14.
0006    //  Copyright © 2014-2015 Big Nerd Ranch. Licensed under MIT.
0007    //
0008    
0009    /// A `LockProtected` holds onto a value of type T, but only allows access to it
0010    /// from within a locking statement. This prevents accidental unsafe access when
0011    /// thread safety is desired.
0012    public final class LockProtected<T
LockProtected.swift:14
    private var item: T
LockProtected.swift:17
    public convenience init(item: T) {
LockProtected.swift:23
    public init(item: T, lock: ReadWriteLock) {
LockProtected.swift:31
    public func withReadLock<Return>(@noescape body: T throws -> Return) rethrows -> Return {
LockProtected.swift:40
    public func withWriteLock<Return>(@noescape body: (inout T) throws -> Return) rethrows -> Return {> {
0013        private var lock
LockProtected.swift:25
        self.lock = lock
LockProtected.swift:32
        return try lock.withReadLock {
LockProtected.swift:41
        return try lock.withWriteLock {: ReadWriteLock
0014        private var item
LockProtected.swift:24
        self.item = item
LockProtected.swift:33
            try body(self.item)
LockProtected.swift:42
            try body(&self.item): T
0015    
0016        /// Create the protected value with an initial item and a default lock.
0017        public convenience init(item: T) {
0018            self.init(item: item, lock: CASSpinLock())
0019        }
0020    
0021        /// Create the protected value with an initial item and a type implementing
0022        /// a lock.
0023        public init
LockProtected.swift:18
        self.init(item: item, lock: CASSpinLock())(item: T, lock: ReadWriteLock) {
0024            self.item = item
0025            self.lock = lock
0026        }
0027    
0028        /// Give read access to the item within `body`.
0029        /// - parameter body: A function that reads from the contained item.
0030        /// - returns: The value returned from the given function.
0031        public func withReadLock<Return>(@noescape body: T throws -> Return) rethrows -> Return {
0032            return try lock.withReadLock {
0033                try body(self.item)
0034            }
0035        }
0036    
0037        /// Give write access to the item within the given function.
0038        /// - parameter body: A function that writes to the contained item, and returns some value.
0039        /// - returns: The value returned from the given function.
0040        public func withWriteLock<Return>(@noescape body: (inout T) throws -> Return) rethrows -> Return {
0041            return try lock.withWriteLock {
0042                try body(&self.item)
0043            }
0044        }
0045    }
0046