// 
// IImmutableMap.cs
// 
// Authors:
// 	Alexander Chebaturkin (chebaturkin@gmail.com)
// 
// Copyright (C) 2011 Alexander Chebaturkin
// 
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//  
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// 

using System;
using System.Collections.Generic;

namespace Mono.CodeContracts.Static.DataStructures {
	interface IImmutableMap<K, V> {
		V this [K key] { get; }

		K AnyKey { get; }

		IEnumerable<K> Keys { get; }
		int Count { get; }
		IImmutableMap<K, V> EmptyMap { get; }

		IImmutableMap<K, V> Add (K key, V value);
		IImmutableMap<K, V> Remove (K key);

		bool ContainsKey (K key);
		void Visit (Func<K, V, VisitStatus> func);

	    bool TryGetValue (K key, out V value);

	    IImmutableMapFactory<K, V> Factory();
	}

    internal interface IImmutableMapFactory<K, V> {
        IImmutableMap<K, V> Empty { get; }
    }
}