davecom/SwiftGraph

//
//  Stack.swift
//  SwiftGraph
//
//  Copyright (c) 2014-2019 David Kopec
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.

/// Implements a stack - helper class that uses an array internally.
public class Stack<T> {
    private var container: [T] = [T]()
    public var isEmpty: Bool { return container.isEmpty }
    public func push(_ thing: T) { container.append(thing) }
    public func pop() -> T { return container.removeLast() }
}