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Re: [Boost-users] Newbie question: block read inputs to regex
by annirak＠shaw.ca 17 Dec '03

17 Dec '03

----- Original Message ----- From: John Maddock <john(a)johnmaddock.co.uk> Date: Saturday, December 13, 2003 4:06 am Subject: Re: [Boost-users] Newbie question: block read inputs to regex > > I'm using regex_grep() to search through file contents for > matches. I > want to read the file in blocks to keep memory use down for large > files.What I want to know is whether there is some way of adding > the next block of > memory to the grep where the last one left off. > > > > The best solution I can come up with is using some sort of > double-buffering scheme, but that would take an awful lot of > memory copies > and searching some text multiple times. Both things I would > prefer to > avoid. > > > > What can I do? > > Have you looked at the partial match examples - there is one that > searches a > file in chunks. > > John. Ah, thank you, somehow I had missed that. --Brendan

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Boost Software License: redistribute modified works?
by Steve M. Robbins 16 Dec '03

16 Dec '03

Hi, I've a question for the drafters of the Boost Software License - Version 1.0 - August 17th, 2003. Put yourself in the position of someone who wants to redistribute a modified version of Boost. For example, the linux distributors like Debian. The license begins with the permission grant: Permission is hereby granted, free of charge, to any person or organization obtaining a copy of the software and accompanying documentation covered by this license (the "Software") to use, reproduce, display, distribute, execute, and transmit the Software, and to prepare derivative works of the Software, and to permit third-parties to whom the Software is furnished to do so, all subject to the following: [... a restriction and a disclaimer paragraph ...] As I read this, "the Software" means "the unmodified tar or zip file obtained from boost.org". Is that correct? I'm permitted to "prepare derivative works of the Software", but the license doesn't specify what I may do with my derivative works. Clearly, I may distribute "the Software", but may I distribute the derivative work? Some licenses (e.g. the BSD and the GPL) make it clear that the terms apply to both the software and to derivative works. Shouldn't the boost license do likewise? -Steve

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building boost libraries on Solaris
by K. Herman Chen 16 Dec '03

16 Dec '03

Has anyone built Boost Libraries using Sun/Solaris CC? I first built bjam using gcc on Solaris. But in the next step, 'bjam "-sTOOLS=CC"' (ie Solaris CC), it failed miserably. Since CC is not in the Supported Toolsets, does it mean I cannot build Boost libraries using Sun/Solaris CC? Any pointers would be appreciated. Thanks. herman

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msvc-stlport creates name mangled functions with std:: not _STL::
by John Bustard 16 Dec '03

16 Dec '03

I can't seem to link with the filesystem lib when built with the following options: rem Get environment right for compiler -- comment out after first run rem "C:\Program Files\Microsoft Visual Studio\VC98\Bin\VCVARS32.BAT" rem Setup for Boost.Python rem Setup for Boost 'toolset' set STLPORT_PATH=C:\ set STLPORT_4.6_PATH=C:\STLport-4.6 set STLPORT_VERSION=4.6 bin.ntx86\bjam "-sTOOLS=msvc-stlport" "-sBUILD=<stlport-iostream>on" the name mangled function that is exported is ?leaf@path@filesystem@boost@@QBE?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ but the function that msvc tries to link with is: ?leaf@path@filesystem@boost@@QBE?AV?$basic_string@DV?$char_traits@D@_STL@@V? $allocator@D@2@@_STL@@XZ Two things I've noticed that are a bit wierd are that the boost libs are put in stlport-4.5.3 directory even when built with the options directing it to 4.6. Also stlport has an option to put itself in the std namespace but merely #defines std as _STL so I would have expected the exported function from the boost library to be _STL not std. Any ideas, thanks John

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generate_random_graph
by Matthew Galati 16 Dec '03

16 Dec '03

Newbie Question Can someone post a simple example of how to generate a random graph? I do not understand what needs to be sent in the 4th argument for RandNumGen. To keep it simple, how would I generate a random graph on 10 vertices and 20 edges? generate_random_graph(g, 10, 20, ?, false, false); Thanks, Matt

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Couldn't find status of Thread Priority...
by Brian Carlson 15 Dec '03

15 Dec '03

I was searching the boost site, and saw that in the Nov '02 timeframe that thread priority was not implemented. Is that still the case? I'm on XP and want to have one of my logging threads have a lower priority. Thanks, Brian

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RE: [Boost-users] find japanese character with boost regex++
by Ben Hutchings 15 Dec '03

15 Dec '03

John Maddock <john(a)johnmaddock.co.uk> wrote: <snip> > It might be best to add a facility to add new character classes as a > list of characters and ranges to include, something like: > > register_character_class("myname", "d-f"); > > Then we add all the Unicode block ranges as standard for wide > character regexes. Aside from the unified Han characters (kanji/hanzi), characters of the same category generally aren't neatly grouped together in Unicode. The 128-character blocks tend to correspond to locales, communities of use or specific legacy encodings and not to categories. You need a look-up table (or more efficiently two levels of table) to check character categories.

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find japanese character with boost regex++
by jschmid 15 Dec '03

15 Dec '03

Hi, I have just discovered the incredible boost and regex++ libraries but I have encountered some difficulties... I read that the japanese special encoding is handled in regex++, specially using wide char wchar characters. In the regex++ faq, it is presented the system of class , ex. [[:space]], in order to define a set of characters with a same property. I have been looking for a kind of [[:Japanese characters]] class. Actually I have a text with a lot of strange characters and japanese one ( Hiragana, katakan, Kanji everything..!) and I want to find these japanese sentence in order to translate them and replace in the text. I need hence a way in order to identify a japanese sentence . A kind of function const bool isJap( const wchar ) const would be fine. So if somebody has any idea or a some links, I would appreciate it! Thanks! Schmid

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Re: Using graph library in VC++ 6.0 -> Change stl library?
by rohou 15 Dec '03

15 Dec '03

Using Boost graph library in VC++ 6.0, do I have to change the stl dlivered with VC6.0? What is the service pack I should use? Thanks, Boris

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Boost::shared_ptr and memory leaks
by INsideR 15 Dec '03

15 Dec '03

Hello, I have wrote simple programm: using namespace boost; shared_ptr<int> a(new int(10)); shared_ptr<int> b; b=a; a.reset(new int(20)); std::cout<<"a=="<<*a<<" b=="<<*b; return 0; Checking this programm with DevPartner BoundsChecker, i found memory leak: Type Quantity Total (bytes) Allocation Location Sequence Leak exiting program 1 84 setlocale - [setlocal.c, line 547 (Boostt.exe)] 9 Memory Leak Exiting Program: Address 0x00E44F88 (84) allocated by _malloc_dbg. <if ( (ptloci = _malloc_crt( sizeof(threadlocinfo) )) == NULL )> Where is the problem? May be i write incorrect code? Best Wishes, Yury mailto:insider83@inbox.lv

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