69 lines
1.8 KiB
C#
69 lines
1.8 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2014 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation. For more information,
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* see COPYING.
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace OpenRA.Primitives
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{
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static class BitAllocator<T> where T : struct
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{
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static int nextVal = 1;
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static Cache<string, int> bits = new Cache<string, int>(_ => Allocate());
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static int Allocate()
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{
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if (nextVal == 0)
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throw new InvalidOperationException(
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"Too many values in BitAllocator<{0}>".F(typeof(T).Name));
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var val = nextVal;
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nextVal <<= 1;
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return val;
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}
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public static int GetValue(string[] val)
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{
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return val.Select(a => bits[a]).Aggregate(0, (a, b) => a | b);
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}
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public static IEnumerable<string> GetStrings(int val)
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{
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for (var i = 0; i < 32; i++)
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{
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var x = 1 << i;
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if ((val & x) != 0)
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yield return bits.Single(a => a.Value == x).Key;
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}
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}
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}
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public struct Bits<T> : IEquatable<Bits<T>> where T : struct
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{
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public int Value;
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public Bits(string[] val) { Value = BitAllocator<T>.GetValue(val); }
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public Bits(Bits<T> other) { Value = other.Value; }
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public override string ToString()
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{
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return BitAllocator<T>.GetStrings(Value).JoinWith(",");
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}
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public static bool operator ==(Bits<T> me, Bits<T> other) { return me.Value == other.Value; }
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public static bool operator !=(Bits<T> me, Bits<T> other) { return !(me == other); }
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public bool Equals(Bits<T> other) { return other == this; }
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public override bool Equals(object obj) { return obj is Bits<T> && Equals((Bits<T>)obj); }
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public override int GetHashCode() { return Value.GetHashCode(); }
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}
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}
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