b733465f33
- Made private methods static where possible (runtime can elide checking the object for null). - Declared attribute classes as sealed (allows reflection on attributes to complete faster). - Moved some static cctor's into field initializers (static cctor's are slower than static field initializers). - Made classes static if they contained only static methods (can't create instances of useless objects). - Use inferable Exts.Lazy and not new Lazy<T>(). - Added required STAThread attribute to CrashDialog. - Removed unused parameters in private methods. - Added Serializable attribute to exceptions. - Added parameter name in calls to ArgumentNullException. - Use of as operator instead of is + cast. - Changed (x as Foo).Bar anti-pattern into ((Foo)x).Bar. Results in sensible cast exceptions on error rather than null dereferences. - Removed unused method in NullShader.
64 lines
1.5 KiB
C#
64 lines
1.5 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2011 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> 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 override int GetHashCode() { return Value.GetHashCode(); }
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}
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}
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