- Boost-users - lists.boost.org

Regex problem
by Dave DeLong 12 Mar '08

12 Mar '08

Hi everyone, I'm trying to parse an HTML page using the Regex library and am running in to errors. In the following snippets, "pageSource" is a string pointer to the contents of an html file. This code causes my app to crash: void Page::removeScriptTags() { boost::regex tagRegex("<[sS][cC][rR][iI][pP][tT][\\w\\W]*?>[.]*?</\ \s*?[sS][cC][rR][iI][pP][tT]\\s*?>"); string replaced = boost::regex_replace(*pageSource, pageSource, tagRegex, " ", boost::match_default); delete pageSource; pageSource = new string(replaced); } and this code crashes when attempting to destruct "matches": void Page::findTitleSummary() { boost::cmatch matches; boost::regex bodyRegex("<[tT][iI][tT][lL][eE][\\w\\W]*?>([^<]*)</\\s*? [tT][iI][tT][lL][eE]\\s*?>"); if (boost::regex_search(pageSource->c_str(), matches, bodyRegex)) { pageSummary = new string(matches[1]); hasFoundSummary = true; } } What am I missing? Thanks, Dave

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Re: [Boost-users] link problem: boost + stlport + msvc8
by CHABO Gabriel 12 Mar '08

12 Mar '08

Hi, I'm still having problems with this issue, so I'll repost it: This is my setup: Windows XP SP2 Visual Studio 2005 STLport-5.1.5 boost_1_34_1 I'm trying to write a tiny program, just to get stlport and boost to play nice together and I still have "unresolved external symbol" errors. I downloaded stlport-5.1.5 and built it according to the instructions: * configure.bat -c msvc8 * nmake /f msvc.mak * nmake /f msvc.mak install I also added stlport\bin to my path Next, I downloaded the boost_1_34_1 windows installer and checked all the options to get all the libraries and added it to my path. Next, I configured visual studio 2005 as follows: Tools -> Options -> Project and Solutions -> VC++ Directories -> Show directories for: Include Files: Add the path to stlport headers (D:\Program Files\STLport-5.1.5\stlport) Library Files: Add the path to stlport libs (D:\Program Files\STLport-5.1.5\lib) Next, on the project level, I Added __STL_DEBUG to the list of preprocessors. I'm trying to build a Multi-threaded Debug DLL (/MDd). I also set the (/Zc:wchar_t-) option. I also added "D:\Program Files\boost\boost_1_34_1" to the list of Additional Include Directives. When I tried to link, I got an error saying that libboost_program_options-vc80-mt-gdp-1_34_1.lib could not be found, so I had to build it. I edited the user-config.jam file to add the following line: using stlport : : D:/Program Files/STLport-5.1.5 D:/Program Files/STLport-5.1.5/lib ; This is the command I used to build the new lib bjam --toolset=msvc-8.0 link=static stdlib=stlport threading=multi cxxflags="-Zc:wchar_t-" --with-program_options -a -d2 I built the lib and moved it from bin.v2 to lib. As you can see I took every precaution with wchar_t so that all the libs are compatible, and still every time I try to link the simple program I get this error: error LNK2019: unresolved external symbol "public: __thiscall boost::program_options::options_description::options_description(class stlpd_std::basic_string<char,class stlpd_std::char_traits<char>,class stlpd_std::allocator<char> > const &,unsigned int)" (??0options_description@program_options@boost@@QAE@ABV?$basic_string@DV? $char_traits@D@stlpd_std@@V?$allocator@D@2@@stlpd_std@@I@Z) referenced in function _main This is the simple program in question: #include <iostream> #include <boost/program_options.hpp> int main(int argc, char* argv[]) { std::cout<<"boost stlport test\n"; boost::program_options::options_description desc("Allowed options"); return 0; } Any help is greatly appreciated Thx Gabriel ******************************* This e-mail contains information for the intended recipient only. It may contain proprietary material or confidential information. If you are not the intended recipient you are not authorised to distribute, copy or use this e-mail or any attachment to it. Murex cannot guarantee that it is virus free and accepts no responsibility for any loss or damage arising from its use. If you have received this e-mail in error please notify immediately the sender and delete the original email received, any attachments and all copies from your system.

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[mpl] integral constant overflow
by klaus triendl 11 Mar '08

11 Mar '08

Hi, I've recently started studying the book "c++ template meta programming" (I like it a lot!) and one of my own exercises was to get an integral type's max/min value. To get the type's maximal value I've created a metafunction max_val; Compiling the code below with vc++2008 warning level 2+ yields the warning "truncation of constant value" or "integral constant overflow" if I use an int instead of a char. <code> namespace mpl = boost::mpl; template<typename T> struct significant_bits: mpl::int_<std::numeric_limits<T>::digits> {}; template<typename T> struct max_val_impl: mpl::accumulate< mpl::range_c<int, 1, significant_bits<T>::value>, mpl::integral_c<T, 1>, mpl::next<mpl::plus<mpl::_1, mpl::_1> > > {}; template<typename T> struct max_val: max_val_impl<T>::type { BOOST_MPL_ASSERT((boost::is_integral<T>)); }; int main() { const char maxval = max_val<char>::value; return 0; } </code> The problematic metafunction instantiation boils down to mpl::integral_c<char, 127> where mpl::integral_c<char, 127>::next results in 128 which is then truncated. Of course I can turn off the compiler warnings but since the warning happens in integral_wrapper.hpp and the integral constant stuff is included in many other files including the boost type traits it would be tedious to always remember to include integral_c.hpp explicitly before any other headers with the warnings turned off. I don't know whether there is a really satisfying option, just wanted to discuss this point. Klaus Triendl

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Serialization registration?
by Jerry 11 Mar '08

11 Mar '08

Hi, boost::serialization is wonderful. It has saved a massive amount of effort when adding XML based storage to an existing C++ drawing library. A very big thank you to the author and the team. Questions arising: 1. After one or two crash & burn cycles i discovered the need to register derived classes in the 'save through a virtual base class pointer' scenario. Right now this is done when saving to/loading from the archive. Is there an alternative to this method that ensures registration occurs automatically? i'm sure this is a FAQ but cannot find a definitive answer. i..e // XML archive boost::archive::xml_iarchive ia(ifs); // ensure derived types are registered - too easy to forget, what's the better way? ia.register_type(static_cast<CDiagramButton*>(NULL)); 2. Serializing to a binary storage should be a great way to implement undo/redo and clipboard functionality - has anyone found fame and fortune doing this? Cheers Jerry.

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[Boost.Test]Possible BOOST_CLASS_TEST_CASE bug
by Tomislav Adamic 11 Mar '08

11 Mar '08

Code below doesn't compile. Workaround is provided also but is not satisfactory ------------------------------------------------------------------------------- #include <boost/test/unit_test.hpp> #include <boost/shared_ptr.hpp> using namespace boost::unit_test; class ToBeTested { public: ToBeTested() {} int feature1() const { return 1; } int feature2() const { return 2; } }; class ComplexTest { public: ComplexTest() {} void test1() const { ToBeTested t; BOOST_CHECK (t.feature1() == 1); } void test2() { ToBeTested t; BOOST_CHECK (t.feature2() == 2); } }; class TestSuite : public boost::unit_test::test_suite { public: typedef boost::shared_ptr<ComplexTest> ComplexTestPtr; TestSuite () : boost::unit_test::test_suite ("test suite") { ComplexTestPtr instance (new ComplexTest); test_case* t1 = BOOST_CLASS_TEST_CASE (&ComplexTest::test1, instance); test_case* t2 = BOOST_CLASS_TEST_CASE (&ComplexTest::test2, instance); add (t1); add(t2); } }; boost::unit_test::test_suite* init_unit_test_suite( int argc, char * argv[] ) { framework::master_test_suite().add(new TestSuite); return 0; } ------------------------------------------------------------------------------- MSVC 2005 gives following compile time message: test_case* t1 = BOOST_CLASS_TEST_CASE (&ComplexTest::test1, instance); : 'boost::unit_test::make_test_case' : function does not take 3 arguments Problem: ComplexTest::test1() is const method. BOOST_CLASS_TEST_CASE refuses to work properly with const methods. ComplexTest::test2() is not const and works as expected. Workaround Methods from test classes that will be used by BOOST_CLASS_TEST_CASE should not be const. Information applies to: boost v1.34.1 WinXP SP2 Microsoft Visual Studio 2005 SP1

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Help with [Boost.Iterator] conditional operator
by Robert Umland 11 Mar '08

11 Mar '08

I just recently started using boost and had a question about the ++operator for iterators. What I have is a class foo that has a container of class bar. class foo { private: multimap<bool, bar> container; public: pair<bar::iterator, bar::iterator> get_container( bool usable ); }; class bar { public: /* * Return true if bar is usable, false otherwise. */ bool isUsable(); }; I would like to overload the ++operator for multimap so that I can return all bar's that are usable, i.e. call the bar::isUsable() function before returning the pair of iterators. I did find this web page: http://www.zeta.org.au/~jon/STL/views/doc/views.html and was wondering if boost had anything like this already. Thanks. -- ~Robert Umland

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Re: [Boost-users] [uBLAS] iterator for matrix?
by Lang Stefan 11 Mar '08

11 Mar '08

You may be looking for the matrix storage container which you can access via matrix<...>::data() like this: #include <boost/numeric/ublas/matrix.hpp> using namespace std; using namespace boost::numeric::ublas; matrix<double> m (3, 3); copy ( m.data().begin(), m.data().end(), ostream_iterator<double>(cout, " ") ); Of course, if you have a sparse matrix, the number of elements referenced by matrix::data() may be lower than the number of elements your matrix normally should have. Also you have no control over the order of elements: they may be stored by row, by column, or in yet another way! Cheers, Stefan > Date: Tue, 11 Mar 2008 14:25:58 +0800 > From: "Chung-Lin Wen" <jonathan.clwen(a)gmail.com> > Subject: [Boost-users] [uBLAS] iterator for matrix? > To: boost-users(a)lists.boost.org > Message-ID: > <eb7d82f30803102325w448b5a81w352bfa71a48b7258(a)mail.gmail.com> > Content-Type: text/plain; charset="iso-8859-1" > > Hi, > > It seems the ublas::matrix don't have begin() and end() that > the ordinary > STL container would have. > It do have begin1(), begin2(), end1(), end2(), but it only > traverse a row or > a column. > So, how could I use the iterators rather than hand-crafted for-loop to > traverse the whole matrix? > > e.g., > copy( matrix.begin(), matrix.end(), > ostream_iterator<element_type>(cout, " ") ) ; // ERROR: won't > compile: matrix don't have begin & end > > (I know matrix have overloaded the operator<<, it's only an example )

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Boost forceinline?
by Robert Dailey 11 Mar '08

11 Mar '08

Hi, I read a thread a while back posted on the boost mailing list concerning a need for a portable forced inline option from the boost library. Instead of giving the OP a direct answer, conversation lead on to discussion involving use cases for forced inline and whether or not it was appropriate to use it, which wasn't very helpful. I'm posting here to see if the boost library has such a feature. I did some searching but I was not able to find anything helpful. Help is appreciated. Thanks in advance.

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[uBLAS] iterator for matrix?
by Chung-Lin Wen 11 Mar '08

11 Mar '08

Hi, It seems the ublas::matrix don't have begin() and end() that the ordinary STL container would have. It do have begin1(), begin2(), end1(), end2(), but it only traverse a row or a column. So, how could I use the iterators rather than hand-crafted for-loop to traverse the whole matrix? e.g., copy( matrix.begin(), matrix.end(), ostream_iterator<element_type>(cout, " ") ) ; // ERROR: won't compile: matrix don't have begin & end (I know matrix have overloaded the operator<<, it's only an example )

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REG_PERLEX
by Phil Hystad 10 Mar '08

10 Mar '08

Does anyone know the definition of REG_PERLEX? I am using the regex/regcomp traditional unix/posix API supported by Boost Regular Expression library. On a Windows 32 bit platform we are forced to use REG_PERLEX on the regcomp flags argument whereas for the same application we get by using a zero flag value on regcomp on platforms: Mac OS X and Linux. Thanks, phil phystad(a)mac.com

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