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boost::filesystem -- "Aborted"
by matthias 31 Jan '05

31 Jan '05

Hi, I am currently writing a gtkmm component which acts as a file browser, much like a small filemanager which can be embedded in gtkmm applications as a scrolled window. I have just rewritten the component to use the boost::filesystem classes instead of the C functions for interacting with the filesystem. However I am getting a strange error when I start my app: When iterating through a directory I suddenly get the message: Aborted. void FileBrowser::rebuild_file_list() { namespace boostfs = boost::filesystem; boostfs::path cur_path( m_cur_dir ); FileContainer tail; // m_files will first only contain directories, // while tail will contain only files m_files.clear(); try { boostfs::directory_iterator end; for( boostfs::directory_iterator dir( cur_path ); dir != end; ++dir ) { std::cout << (*dir).string() << std::endl; if( boostfs::is_directory( *dir ) ) m_files.push_back( *dir ); else tail.push_back( *dir ); } } catch( std::runtime_error & e ) { std::cerr << e.what() << std::endl; } m_files.sort( SortedByName() ); tail.sort( SortedByName() ); drx::list_concat( m_files, tail ); } OUTPUT: [...] /home/mkay/.acrobat /home/mkay/.synce /home/mkay/.gimp-2.0 /home/mkay/.fonts /home/mkay/.designerrctb2 /home/mkay/.eclipse /home/mkay/.gftp /home/mkay/.ntrc_2 /home/mkay/.DCOPserver_anthrax__0 /home/mkay/.DCOPserver_anthrax_:0 /home/mkay/.kpackage /home/mkay/.fonts.conf /home/mkay/.xscreensaver /home/mkay/xdefaults_old /home/mkay/.reslisarc /home/mkay/.aMule /home/mkay/.gtkrc Aborted At this point the application exits. Any idea what is causing this? Thanks in advance, Matthias

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enabling boost::threads for HP-UX
by Oliver Kowalke 31 Jan '05

31 Jan '05

Hi, I want to use boost on HP-UX together with gcc-3.3.2. As I figured out that thread-support is disabled (BOOST_DISABLE_THREADS is defined in file boost/config/platform/hpux.hpp). Up gcc-3.3 posix-threads are supported on HP-UX-plattform (http://gcc.gnu.org/install/specific.html#hppa*-hp-hpux11) Is it then save to remove #define BOOST_DISABLE_THREADS in boost/config/platform/hpux.hpp? with best regards, Oliver -- "Der Spezialist ist ein Barbar, dessen Unwissenheit nicht allumfassend ist." Master's Voice, S.LEM

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Setting the path to use Boost
by Grek 31 Jan '05

31 Jan '05

Hi fellow Boost users! I am new to the Boost Graph Library (BGL) and I have a query about setting the path to access the library. My platform is Cygwin. I want to use the g++ command and incorporate the BGL in it. How do I go about it? Let's say that I want to use the dijkstra's algorithm. I set the path as follows: boost_1_32_0/libs/graph/example Then I typed the following. g++ -g dijkstra-example.cpp But it displays error messages and I do not know how to proceed. It would be of great help if anyone could tell me how one has to set the path to use the dijkstra's algorithm in a program. Thanks for taking the time to read through this! Cheers Grek --------------------------------- Do you Yahoo!? Yahoo! Search presents - Jib Jab's 'Second Term'

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atlanta statics...
by Jeffrey Holle 31 Jan '05

31 Jan '05

http://houseandhome.msn.com/pickaplace/comparecities.aspx?FromState=WA&From… Hope this link works for you. It takes 5 min. to load a page from website for me. Microsoft's MSN uses windows technology now I guess... The big thing that stands out for me is crime. Seattle is above the national average by about 2x, Atlanta appears to be between 7 and 8 times! I'll have to consider such a move with care....

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Thread stack size
by Thorsten Froehlich 30 Jan '05

30 Jan '05

Hi, Googling I found a thread "Boost.Threads. Anything happening?" (in July 2004) in comp.lang.c++.moderated that suggests there should be a development branch of the thread code that already supports this feature. Unfortunately I cannot find the right branch for it in the boost CVS (using the web CVS viewer). The thread_dev and thread_development branches I found do not appear to be the correct ones as they have not been changed for a very long time and the above mentioned thread suggests it would be a rather recently added feature. While I could add this feature myself for the platforms that I need, I would prefer to avoid duplicating work already done. Could someone point me where to find the branch referred to in the above mentioned comp.lang.c++.moderated thread? Regards, Thorsten Froehlich

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Bug in lexical_cast<> with doubles
by Leon Raj 29 Jan '05

29 Jan '05

I think I've found a bug in the boost::lexical_cast<> library (v1.31.0) on WinXP SP1, MSVC 6.0 (sp5) and MSVC.NET 2003. --- Start code snippet --- #include <boost/lexical_cast.hpp> #include <iostream> int main( int argc, char* argv[] ) { double dMax = = std::numeric_limits< double >::max(); // On a Win32 x86 system, dMax is now 1.7976931348623157e+308 // This is successful and strMax is "1.797693134862316e+308" std::string strMax = boost::lexical_cast< std::string >( dMax ); try { double newDMax = boost::lexical_cast< double >( strMax ); std::cout << "Successfuly" << std::endl; } catch ( boost::bad_lexical_cast& ) { std::cout << "Failed to cast" << std::endl; } // On a Win32 x86 system, this always fails, // because (I think) strMax overflows a double, // because 1.7976931348623157e+308 is *rounded UP* // to 1.797693134862316e+308, which cannot be // represented by a double } --- End code snippet --- ----------------------------------------------------- Leon Raj Senior Engineer Invetech Pty. Ltd. Phone: +61 3 9211 7000 (Switchboard) +61 3 9211 7938 (DDI) leon.raj(a)invetech.com.au IMPORTANT - This e-mail and any attachments may be confidential. Any retransmissions, dissemination or other use of these materials by persons or entities other than the intended recipient is prohibited. If received in error, please contact us and delete all copies. Before opening or using attachments, check them for viruses and defects. Our liability is limited to resupplying any affected attachments. [Any representations or opinions expressed in this e-mail are those of the individual sender, and not necessarily those of Vision Systems Limited].

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Unit test case inheritance problem
by Bill Lear 29 Jan '05

29 Jan '05

I am having trouble working around a problem with inheriting unit test cases. Suppose I have a base class Foo and several derived classes. Suppose I have a corresponding base test case and I would like to reuse that base test case with test cases for the derived classes. What I would like to do is this, in highly stylized form: class BaseFooTestCase { public: virtual Foo* create() = 0; void test_base() { Foo* foo = create(); // test foo ... } void add(test_suite* ts) { ts->add(BOOST_CLASS_TEST_CASE(&BaseFooTestCase::test_base, this); } }; class DerivedFooTestCase { public: virtual Foo* create() { return new Derived(); } void test_derived() { Foo* foo = create(); // test foo } void add(test_suite* ts) { BaseFooTestCase::add(ts); ts->add(BOOST_CLASS_TEST_CASE(&DerivedFooTestCase::test_derived, this); } }; Then, something like this: test_suite* init_unit_test_suite(int, char* []) { auto_ptr<test_suite> ts(new test_suite("test")); DerivedFooTestCase* tc = new DeriveFooTestCase(); tc->add(ts); return ts; } However, I can't get the add() methods in the test case classes worked out. The BOOST_CLASS_TEST_CASE macro seems to want a shared_ptr, and passing "this" to it does not seem to work. Could anyone please provide an example of how to do this? Every time I try to work this out, I end up with a mess --- static allocator methods, weak_ptr wrapped by shared_ptr, and other workarounds --- all of which works, but is really quite a lot of effort for what I want and is overly complex for me to recommend to my team as a solution. Any help appreciated. Thanks. Bill

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Bug in date_time?
by John Eddy 29 Jan '05

29 Jan '05

If I create a file with nothing but the include: #include <boost/date_time/local_time/local_time.hpp> I get a compiler error (VC7 .NET 2003) having to do with line 149 of tz_db_base.hpp which reads: typedef time_zone_names<charT> time_zone_names; which doesn't seem to make much sense. from a brief inspection of the time_zone_names.hpp file, it seems that line 64 which reads: typedef time_zone_names_base<char> time_zone_names; may shed some light on the solution. Thanks, John

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thread pool help
by Cory Nelson 28 Jan '05

28 Jan '05

I'm coding a simple thread_pool class, with the help of boost. I wrote a simple test case, and things seem to be out of sync - not all the work gets executed. I think I am using boost::condition wrong, can someone take a look? -- Cory Nelson http://www.int64.org

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Re: Re: [Boost-users] Warnings in date_time
by John Eddy 28 Jan '05

28 Jan '05

Jeff, Actually, they turned up at warning level 3. If you would like, I can send you the warnings for level 4. John On Thu, 27 Jan 2005 19:28:53 -0500, John Eddy wrote >> Hello, >> >> I just started using the date-time library and it is a great >> library. > > Thanks. >> There are a few warnings that I have noticed so far that >> could be avoided with some explicit casts. I am using VC .NET 2003. > > Yes, thanks. Turns out it's hard for us to see these because warnings have come out in the regression tests. I notice these still aren't coming out -- I assume this is warning level 4? We'll take care of them, eventually. Some of this code is being redone for 1.33... Jeff

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