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Re: Avoiding int.ToString() GC garbage
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 nop:Come to think of it I should probably clean up the code and release it or something...
Well, it took me almost a month, but I finally found some time and untangled the font code from my hideous mess of a utility library and put it up on Google code. Sorry for the lack of sample project, etc, work is killing me right now and I haven't had much time to get everything I want to release in a reasonably good state. You can look at the FrameStats component if you want to get an idea of where to start with it.
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Re: Avoiding int.ToString() GC garbage
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I decided to use CLR Profiler on my emulator and came across the same problem as described in this thread. I threw together a quick and dirty StringBuilder extension method that verifies it can avoid generating garbage:
| public static class StringBuilderExtensions |
| { |
| public static StringBuilder AppendWithoutGarbage(this StringBuilder stringBuilder, int number) |
| { |
| if (number < 0) |
| { |
| stringBuilder.Append('-'); |
| number = Math.Abs(number); |
| } |
| |
| int index = stringBuilder.Length; |
| do |
| { |
| stringBuilder.Insert(index, _digits, number % 10, 1); |
| number /= 10; |
| } |
| while (number > 0); |
| |
| return stringBuilder; |
| } |
| |
| private static readonly char[] _digits = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' }; |
| } |
For some reason the StringBuilder.Insert(Int32, Char) overload calls ToString() internally, but this isn't in the Compact Framework anyway, so I use StringBuilder.Insert(Int32, Char[], Int32, Int32). Obviously there's a performance vs garbage tradeoff ... so consider this a starting point that eliminates the garbage with the least effort.
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Re: Avoiding int.ToString() GC garbage
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Your function fails if I try to append the number -2147483648 :-)
It's the only legal "int" that it fails for, though.
Jon Watte, Direct3D MVP Tweets, occasionallykW X-port 3ds Max .X exporter kW Animation source code
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Re: Avoiding int.ToString() GC garbage
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Doh! The following will handle that boundary case:
| public static class StringBuilderExtensions |
| { |
| public static StringBuilder AppendWithoutGarbage(this StringBuilder stringBuilder, int number) |
| { |
| if (number < 0) |
| { |
| stringBuilder.Append('-'); |
| } |
| |
| int index = stringBuilder.Length; |
| do |
| { |
| stringBuilder.Insert(index, _digits, (number % 10) + 9, 1); |
| number /= 10; |
| } |
| while (number != 0); |
| |
| return stringBuilder; |
| } |
| |
private static readonly char[] _digits = new char[]
{
'9', '8', '7', '6', '5', '4', '3', '2', '1', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'
}; |
| } |
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Re: Avoiding int.ToString() GC garbage
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Is this still the recommended way to handle String manipulation without generating garbage, or have there been any breakthroughs since this posting? I haven't been able to find another solution yet (or one that supports floating point numbers, or even appending two StringBuilders).
Matt Hughson [ Website ] [ Résumé ] [ Contact ]Playtest: Man Moments
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