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Iterators
by Witz 24 Apr '04

24 Apr '04

just a quick question - which maybe should have been directed at the developers list but ... would it be possible in the iterator adaptors to have an operator== defined that takes the base iterator as the right hand side? it would certainly cut down on typing and also obviate the need to create an end iterator that is only used as an 'end of container' sentinel value if it was possible it would allow us to write, for example: copy( make_filter_iterator<is_positive_number>(numbers, numbers + N), numbers + N, ostream_iterator<int>(cout, " ")); rather than: copy( make_filter_iterator<is_positive_number>(numbers, numbers + N), make_filter_iterator<is_positive_number>(numbers + N, numbers + N), ostream_iterator<int>(cout, " ")); of course i am aware that i might be missing something obvious ... ian whittley

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boost format problems
by Navneet Dalal 23 Apr '04

23 Apr '04

Hi I decided to try boost::format for more compact and typesafe formatting of text. However, I am running into some problems. Problem 1 ============== The following line throws boost:bad_format_string exception. std::cout << format("%|1| %|2$3|") % "Hello" % 3 << std::endl; However, this one works std::cout << format("%|1|") % "Hello" << std::endl; All I want to do is use notation for printing character streams i.e. %|1| instead of %1% Is this a bug or I am doing something wrong? Problem 2 ============= How can I print a float such that it appends 0 for remaining precision digits. For e.g. let us say I want to print 0.2 with 5 characters of overall length and till 3 digits of precision. Kind of output I am looking for is 0.200 One would expect that following command may work (as I am indicating left print, fill any remaining characters and till 3 digits of precision after decimal) std::cout << format("#%|1$-05.03|#") % 0.2 << std::endl; // however it prints #0.2 # This command prints something like std::cout << format("#%|1$05.03|#") % 0.2 << std::endl; // it prints #000.2# with C++ cout, I can print it like std::cout << '#' << std::left << std::setfill('0') << std::setw(5) << std::setprecision(3) << 0.2 << '#' << std::endl; so on similar lines I wrote following line. it works, but it seems ugly to use group only for this std::cout << format("#%|1$-05.3|#") % group(setfill('0'), 0.2) << std::endl; // prints #0.200# Does any one has any other suggestions? regards navneet

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Compilation problem with BOOST::filesystem lib
by Peter Koerber 23 Apr '04

23 Apr '04

Hello, i try to compile the *.cpp files of boost::filesystem within the following environment: os: Windows XP compiler: Visual C++ Toolkit 2003 (this is the free version of MS Visual C++ V7.1) boost: Version 1.31.0 If BOOST_WINDOWS is defined, the file windows.h is included in the sources: * exception.cpp * operations_posix_windows.cpp. Otherwise the file errno.h is included. BOOST_WINDOWS is defined within the environment mentioned above, but the compiler does not have a windows.h include file. Hence compilation fails. OTOH, if BOOST_WINDOWS is "manually" undefined, the errno constant: ETXTBSY is not defined in the file errno.h which comes with the Visual C++ Toolkit 2003. Kind regards Peter

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BGL: INTERNAL COMPILER ERROR in VC7.1
by Nicholas Burlett 22 Apr '04

22 Apr '04

I'm rather unsure about what is causing this, but I get an internal compiler error in Visual C++ 7.1 when using BGL in some specific circumstances. I have a graph defined in class Graph defined as such: typedef property<edge_feedback_t, bool> EdgeFeedback; typedef property<edge_sourcejack_t, IAudioOutputJack*, EdgeFeedback> EdgeSourceJack; typedef property<edge_destinationjack_t, IAudioInputJack*, EdgeSourceJack> EdgeDestinationJack; typedef EdgeDestinationJack EdgeProperty; typedef boost::property<boost::vertex_index_t, int> VertexIndexProp; typedef property<vertex_name_t, nsCOMPtr<IAudioModule>, VertexIndexProp> VertexProperty; typedef adjacency_list<listS, listS, bidirectionalS, VertexProperty, EdgeProperty> graphdata; typedef graph_traits < graphdata >::vertex_descriptor vertdsc; This definition works fine in the graph.cpp file that implements the class Graph. However, when I use graph.h in another cpp file, I get bizarre compiler errors: c:\Boost\include\boost -1_31\boost\mpl\aux_\preprocessed\plain\apply.hpp(50) : fatal error C1001: INTERNAL COMPILER ERROR After some trial and error, I narrowed the problem down to needing to have a != between two oedge_iterators _somewhere_ in the cpp file including graph.h. Simply putting the following function into my other files will cause them to compile just fine: void makeVChappy() { typedef graph_traits< Graph::graphdata >::out_edge_iterator oedge_iterator; oedge_iterator oiter, oend; oiter != oend; } I'm a a complete loss as to how this could be happening, but since I have a work-around for now, I'm not going to push the issue too much further at the moment --- I just thought I'd bring this to your attention, and see if anyone knows of a more elegant solution.

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RE: [Boost-users] Compilation problem with BOOST::filesystem lib
by Ben Hutchings 22 Apr '04

22 Apr '04

Peter Koerber <pk(a)ExperTeam.de> wrote: > i try to compile the *.cpp files of boost::filesystem within the > following environment: > > os: Windows XP > compiler: Visual C++ Toolkit 2003 (this is the free version > of MS Visual C++ V7.1) > boost: Version 1.31.0 > > If BOOST_WINDOWS is defined, the file windows.h is included > in the sources: > * exception.cpp > * operations_posix_windows.cpp. > > Otherwise the file errno.h is included. > > BOOST_WINDOWS is defined within the environment mentioned above, > but the compiler does not have a windows.h include file. Hence > compilation fails. <snip> You need to install the Windows Platform SDK as well as the Toolkit.

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problems using VC 7.1 and boost regex library
by Keith Smith 22 Apr '04

22 Apr '04

Sorry if this is a resend, but not sure if the original got sent! I tried your suggestion, and it appears that I still have the same errors. Anyone have any other ideas? (See Attached) -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of John Maddock Sent: Thursday, April 15, 2004 5:45 AM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] problems using VC 7.1 and boost regex library > I have been trying to compile the following code with VC 7.1 ( which > compiled fine with VC 6 ) with no luck. > > std::string m_rBuffer; > boost::regex m_rStartExp; > > string::const_iterator rRawDataBegin = m_rBuffer.begin(); > string::const_iterator rRawDataEnd = m_rBuffer.end(); > > boost::cmatch rStartMessage; > > unsigned int flags = boost::match_default; > while ( boost::regex_search(rRawDataBegin, > rRawDataEnd, > rStartMessage, > m_rStartExp, > flags) ) > > Included is the compiler error report. The match-flags area distinct type, so use: boost::match_flag_type flags = boost::match_default; John. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Problems with installation of boost unit_test_framework
by Matthew Burgess 21 Apr '04

21 Apr '04

Hi folks, http://www.boost.org/libs/test/doc/components/unit_test_framework/compilati… states that I can include <boost/test/included/unit_test_framework.hpp> in order to avoid having to link against the unit_test_framework library. However, the files it #includes are located in the boost test library source directory which doesn't appear to be installed by the default bjam procedure (I just get '/opt/boost/lib' &'/opt/boost/include' directories after installing boost). If it helps to clarify things here's some output: --- bash-2.05b$ cat example1.cpp #include <boost/test/included/unit_test_framework.hpp> using boost::unit_test_framework::test_suite; void test_function() { BOOST_CHECK(2 == 1); // intentional failure } test_suite* init_unit_test_suite(int, char* []) { test_suite* test = BOOST_TEST_SUITE("Unit test example 1"); test->add(BOOST_TEST_CASE(&test_function)); return test; } bash-2.05b$ g++ -I /opt/boost/include/boost-1_31/ -L /opt/boost/lib/ -o test example1.cpp In file included from example1.cpp:2: /opt/boost/include/boost-1_31/boost/test/included/unit_test_framework.h pp:18:47: libs/test/src/execution_monitor.cpp: No such file or directory ... --- The only place I find the required files is in the original location I extracted the boost source tarball to. I can (and have) copied the 'libs' directory to sit inside my 'include' directory and verified this fixes things, but I doubt very much this is the correct solution. I'm particularly concerned that if someone else wants to compile my toy code, simply telling them to "install boost" might not be enough. Related to all this is the issue of best-practice. Should I make efforts not to have to link to a library, what are the trade-offs? Can I simply take a copy of the required boost headers and place them directly in my project's directory structure? If not, is anyone aware of an autoconf style macro that can be used to detect the presence of the boost headers and/or libraries? I took a quick glance at the autoconf-archive but didn't see anything immediately. Thanks for anyone who can hit me with a cluebat (or FAQ pointer). Matt Burgess

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problems using VC 7.1 and boost regex library ( this time with attachment )
by Keith Smith 21 Apr '04

21 Apr '04

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problems using VC 7.1 and boost regex library
by Keith Smith 21 Apr '04

21 Apr '04

I tried your suggestion, and it appears that I still have the same errors. Anyone have any other ideas? (See Attached) -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of John Maddock Sent: Thursday, April 15, 2004 5:45 AM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] problems using VC 7.1 and boost regex library > I have been trying to compile the following code with VC 7.1 ( which > compiled fine with VC 6 ) with no luck. > > std::string m_rBuffer; > boost::regex m_rStartExp; > > string::const_iterator rRawDataBegin = m_rBuffer.begin(); > string::const_iterator rRawDataEnd = m_rBuffer.end(); > > boost::cmatch rStartMessage; > > unsigned int flags = boost::match_default; > while ( boost::regex_search(rRawDataBegin, > rRawDataEnd, > rStartMessage, > m_rStartExp, > flags) ) > > Included is the compiler error report. The match-flags area distinct type, so use: boost::match_flag_type flags = boost::match_default; John. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Selection scheme for boost libraries
by Uli Tuerk 19 Apr '04

19 Apr '04

Hi all! I have a very basic problem with the boost libraries: I used bjam to build all boost libraries for Linux (using "gcc" as toolset and the call 'bjam "-sTOOLS=gcc" install'). All went fine, however I wanted to do the regression tests for boost_regex using the gcc.mak Makefile in <boost_main>/libs/regex/test/regress which uses "-lboost_regex" for linking. The linker reported an error because there is no "libboost_regex.so" in my lib folder unless I created a link with this name to one of the various versions of libboost_regex. A comment for these Makefiles would be helpful for the case when having build all with bjam. When compiling the regex part alone, the library is created in build/gcc with the correct name (libboost_regex.so). I'm new to C++, so maybe I haven't got the point with the sophisticated naming scheme of the libraries, but: for the library "libboost_regex-gcc-mt-d-1_31.so" e.g. are the tool specifier ("gcc") and the version ("1_31") really necessary for a platform using version numbering of the libraries anyway in the ".so" extension? OK, there are still the categories with/without debug and with/without threading. How would you guys select the type of library? In the Makefile? Thanks in advance! Uli ************************************************************************ Uli Türk

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