On Tue, 2008-12-02 at 17:43 -0600, Galchin, Vasili wrote:
Hello,
Some mention is made in corresponding web pages about implementation difference of these three different DataString impl. Any advice?
Perhaps you need to ask a more specific question. Data.ByteString is a simple strict sequence of bytes (as Word8). That means the whole thing is in memory at once in one big block. Data.ByteString.Char8 provides the same type as Data.ByteString but the operations are in terms of 8-bit Chars. This is for use in files and protocols that contain ASCII as a subset. This is particularly useful for protocols containing mixed text and binary content. It should not be used instead of proper Unicode. Data.ByteString.Lazy is a different representation. As the name suggests, it's lazy like a lazy list. So like a list the whole thing does not need to be in memory if it can be processed incrementally. It supports lazy IO, like getContents does for String. It is particularly useful for handling long or unbounded streams of data in a pure style. Data.ByteString.Lazy.Char8 is the Char8 equivalent. Duncan