Atomic way to operate on integers in Swift. Inspired by Java's AtomicInteger

AtomicInteger.swift

import Foundation

public final class AtomicInteger {
    
    private let lock = DispatchSemaphore(value: 1)
    private var _value: Int
    
    public init(value initialValue: Int = 0) {
        
        _value = initialValue
    }
    
    public var value: Int {
        get {
            lock.wait()
            defer { lock.signal() }
            return value
        }
        set {
            lock.wait()
            defer { lock.signal() }
            value = newValue
        }
    }
    
    public func decrementAndGet() -> Int {
        
        lock.wait()
        defer { lock.signal() }
        value -= 1
        return value
    }
    
    public func incrementAndGet() -> Int {
        
        lock.wait()
        defer { lock.signal() }
        value += 1
        return value
    }
}