Christopher Diggins Object Oriented Template Library (OOTL) http://www.ootl.org ----- Original Message ----- From: "Roman Dementiev" <dementiev@ira.uka.de> To: <boost@lists.boost.org> Sent: Monday, February 07, 2005 10:04 AM Subject: [boost] Re: A library: out-of-core containers and algorithms
Thorsten Ottosen wrote:
"Roman Dementiev" <dementiev@ira.uka.de> wrote in message news:cu7m3l$lfo$1@sea.gmane.org... | Thorsten Ottosen wrote: | > "Roman Dementiev" <dementiev@ira.uka.de> wrote in message | > news:cu62pe$a1i$1@sea.gmane.org... | > | Hello, | > | | > | I am developing a library called Stxxl.
| > | Would such a library be interesting for Boost users? Does it fit here? | > | Is it worth to boostify it?
Yes.
| > if you intend to submit it, would it then be possible to make it | > work on more platforms, unix (mac), windows?
I'd suggest that it should work on *all* platforms which support files, not just a handful.
| yes. One must rewrite only the lower layer of Stxxl using native | file access methods and native multithreading.
[snip]
But what I need is the file access itself: create/open/read/write/close file. I would have been using std::fstream as a portable file access method, but it lacks support of files larger than 2 GB. It is really big disadvantage in my case.
On most (many/all?) windows platforms you can not have files of more than 2GB, so I'd suggest you write the code to work with this restriction.
The boost threads library does fit my requirements. I would use when it comes to boostifying Stxxl.
I would strongly support the introduction of a new library such as proposed by Roman, however on the sole condition that it is portable. The current proposal to require native file access methods I think is too limiting. I would propose instead writing a new version of fstream which operates on vectors of files. This can be done relatively easily by using the boost::iostreams library by Jonathan Turkanis, I have posted some very preliminary prototype code (i.e. untested, naive, non-portable) at http://www.cdiggins.com/big_file.hpp just to give a glimpse of one possible approach. The code is modeled after the boost::iostreams::seekable concept ( http://home.comcast.net/~jturkanis/iostreams/libs/iostreams/doc/concepts/see... ) If Jonathan heeds our call, he could probably finish what I started in less than an hour. ;-) Christopher Diggins Object Oriented Template Library (OOTL) http://www.ootl.org