Public implementation of ropes in C#?

是否有在C＃中的Rope数据结构的公共实现？

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For what its worth, here is an immutable Java implementation. You could probably convert it to C# in less than an hour.

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我没有意识到一个Rope实现（虽然可能有一个！），但是如果你只是在串联之后，StringBuilder才能完成这项工作。

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The BigList<T> class from Wintellect Power Collections (a C# data structure library) is somehow similar to rope: http://docs.pushtechnology.com/docs/4.5.7/dotnet/externalclient/html/class_wintellect_1_1_power_collections_1_1_big_list_3_01_t_01_4.html

I measured its performance and it performs pretty well in "start of string inserts":

const int InsertCount = 150000;

var startTime = DateTime.Now;
var ropeOfChars = new BigList<char>();
for (int i = 0; i < InsertCount; i++)
{
    ropeOfChars.Insert(0, (char)('a' + (i % 10)));
}
Console.WriteLine("Rope<char> time: {0}", DateTime.Now - startTime);

startTime = DateTime.Now;
var stringBuilder = new StringBuilder();
for (int i = 0; i < InsertCount; i++)
{
    stringBuilder.Insert(0, (char)('a' + (i % 10)));
}
Console.WriteLine("StringBuilder time: {0}", DateTime.Now - startTime);

Results:

Rope<char> time: 00:00:00.0468740
StringBuilder time: 00:00:05.1471300

But it performs not well in "middle of string inserts":

const int InsertCount = 150000;

var startTime = DateTime.Now;
var ropeOfChars = new BigList<char>();
for (int i = 0; i < InsertCount; i++)
{
    ropeOfChars.Insert(ropeOfChars.Count / 2, (char)('a' + (i % 10)));
}
Console.WriteLine("Rope<char> time: {0}", DateTime.Now - startTime);

startTime = DateTime.Now;
var stringBuilder = new StringBuilder();
for (int i = 0; i < InsertCount; i++)
{
    stringBuilder.Insert(stringBuilder.Length / 2, (char)('a' + (i % 10)));
}
Console.WriteLine("StringBuilder time: {0}", DateTime.Now - startTime);

Results:

Rope<char> time: 00:00:15.0229452
StringBuilder time: 00:00:04.7812553

I am not sure if this is a bug or unefficient implementation, but " rope of chars " is expected to be faster that StringBuilder in C#.

You can install Power Collections from NuGet:

Install-Package XAct.Wintellect.PowerCollections

链接地址: http://www.djcxy.com/p/39794.html

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