December 2003 - Boost-users - lists.stage.boost.cppalliance.org

boost::shared_ptr and stl algorithms
by Bill Eidson 15 Apr '05

15 Apr '05

std::vector< boost::shared_ptr<T> > TVec; I want to write a function object to run std::for_each. to do somework against members of T and accumulate results in functor. My attempts have failed in VC7 with memory errors in my operator() method. struct fo { bool operator()( boost::shared_ptr<T>& t ) { return true; } }; Thanks in advance bille

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Will libraries built on WinNT run on Win98? (MinGW)
by Reed Hedges 31 Mar '05

31 Mar '05

I know that Win98 is not really supported, but is there any chance that libraries (specifically thread and regex) that were build on WinNT using MinGW work on Win98 (in MinGW)? My guess is no, but has anyone tried it? thanks reed

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Problem Building boost for cygwin g++ with stlport on WinXP
by Markus Ruettimann 06 Jan '04

06 Jan '04

Hi all I'm an enthusiastic user of boost since quite a long time. I used MSVC6.0 so far. How ever, I changed to cygwin g++ 3.3.1 for project reasons. I have succesfuly built the latest STLPort version (4.6) and I also use it successfully. How ever, I am not able to build the toolset gcc-stlport. There are errors in the threadding lib and elsewhere, and such ugly things as "to long path names" errors in the console. Does anybody know how to build this toolset and link them together as one static lib? I use boost-1.30.2 with cygwin g++ 3.3.1 on winXP professional. PS: When I build the bjam stuff, what builds without any errors, it uses the MSVC compiler (the output it creates looks like this). Is this a problem? Thanks for your help Markus. -- Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

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how to get started? (not in documentation)
by Tom Weber 01 Jan '04

01 Jan '04

Hello, I downloaded boost today so regard me as a newbie. Boost seems great, but the documentation doesn't mention how I should install boost on my system (redhat 9), and how to link against the built libraries. Sure I can include it in every project (though it's huge!), and make the makefiles link into strange locations such as libs/test/build/bin/libboost_unit_test_framework.a/gcc/debug/runtime-link-static/threading-single/libboost_unit_test_framework.a Is there an easier way? Why aren't packages like boost-[devel-]VERSION.PLATFORM.rpm made? Why aren't all built libraries put in the same directory, with a simple path name? Why isn't the thread library built statically? Is putting a "lib" section with BOOST_THREAD_BUILD_STATIC=1 in the Jamfile a legal fix? (seems to work) Also... I think boost should have a network library. Can anyone recommend a platform-independent network library? I'm thankful for any answer... -- Cheers, Tom Weber http://www.dd.chalmers.se/~np98towe/

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using regex for in-place string modification
by Scott Meyers 29 Dec '03

29 Dec '03

I want to use regex to modify a string in place. In particular, I've read the contents of a file into a string, now I want to do some search/replace functions on the string, then write the modified string back out to the original file. I've looked through the regex documentation, including the October 2001 DDJ article, but I don't see any way to modify a string in place. From what I can tell, regex_merge looks like it does the kind of thing I want, except it doesn't seem to modify in place. I'd prefer to avoid creating two strings of each file's contents, one before regex processsing, one after. Is there functionality in regex that will let me modify a string in place? Thanks, Scott

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problem with regex_fwd.hpp
by Stefan Shishkov 29 Dec '03

29 Dec '03

Hi, I had a small problem using boost::regexp on MS VC 6.0, boost 1.30.2. In one of my headers I included regex_fwd.hpp. The compilation failed with: ..\boost-1.30.2\boost/detail/allocator.hpp(215): error C2065: 'assert': undeclared identifier Allocator.hpp does not include <cassert> probably relying that it will be included before it. I solved this problem by including <cassert> before regex_fwd.hpp but may be it is better to change allocator.hpp? Or probably something is wrong with my configuration? Best regards Stefan

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error C2668 with <boost/regex.hpp>
by Yiftah Frechter 28 Dec '03

28 Dec '03

Hi guys, I'm trying to use boost regex with VC6 Receiving the following error: error C2668: 'sprintf' : ambiguous call to overloaded function there is no "using namespace std" in my code. Appreciate any help. Yiftah

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undirected graph cycle
by magh＠lehigh.edu 27 Dec '03

27 Dec '03

Is there any easy way to use DFS visitors to return a cycle in an undirected graph? The examples show how to detect if a cycle exists. How do you actually extract it? For my instance, I am dealing with an undirected graph that is a 1-tree, i.e., I know there is exactly one cycle. Thanks, Matt ------------------------------------------------- This mail sent through IMP: http://horde.org/imp/

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date_time: number of days between dates
by Lars Schouw 25 Dec '03

25 Dec '03

I found a solution: long no_days(boost::gregorian::date d1, boost::gregorian::date d2) { using namespace boost::gregorian; using namespace boost::posix_time; date_period dp(d1, d2); return dp.length().days(); } --------------------------------- Do you Yahoo!? Yahoo! Photos - Get your photo on the big screen in Times Square

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date_time converting from date to number of days
by Lars Schouw 24 Dec '03

24 Dec '03

I want to find the number of days in-between two days. What is the easiest way to do this? I am using the date_time lib and want to find the number of days from the time_t started. ptime timet_start(date(1970,1,1)); ptime t(d); time_duration diff = t - timet_start; ptime t123(diff); // timeval tv; //drop off the fractional seconds... // tv.tv_sec = diff.ticks()/time_duration::rep_type::res_adjust(); return 0; // return difference.days; Lars Schouw --------------------------------- Do you Yahoo!? Yahoo! Photos - Get your photo on the big screen in Times Square

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