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[iostreams] making a symmetric_filter flushable
by Kessner, Darren E. 30 Dec '07

30 Dec '07

Hi there, First of all thank you to Jonathan Turkanis for the iostreams library - it has been very useful. I am using a filter to calculate a hash on data as it is sent to an ostream, using symmetric_filter. The problem is that even when I flush the filtering_ostream, the extra bytes in the symmetric_filter destination buffer aren't flushed out to the sink until the filtering_ostream goes out of scope (or reset() or pop() is called). I found the following in the FAQ: "Note, however, that there is no guarantee that all data written to a filtering_stream will be forwarded to the final Sink until the stream is closed, unless all the Filters in the underlying chain are Flushable." My questions: 1) How does one make a symmetric_filter Flushable? 2) Is this the best way to do this sort of on-the-fly hash calculation? I've included example code below. Thank you in advance for any advice! Darren #include "boost/iostreams/filtering_stream.hpp" #include "boost/iostreams/filter/symmetric.hpp" #include <iostream> using namespace std; class MySymmetricFilter { public: typedef char char_type; bool filter(const char*& src_begin, const char* src_end, char*& dest_begin, char* dest_end, bool flush) { // just copy everything for (; src_begin!=src_end && dest_begin!=dest_end ; ++src_begin, ++dest_begin) *dest_begin = *src_begin; // do some hash calculation on bytes copied return false; } void close() {} }; struct MyFilter : public boost::iostreams::symmetric_filter<MySymmetricFilter> { typedef boost::iostreams::symmetric_filter<MySymmetricFilter> base_type; MyFilter(int bufferSize) : base_type(bufferSize) {} }; int main() { boost::iostreams::filtering_ostream fos; fos.push(MyFilter(40)); // buffer size == 40 fos.push(cout); fos << "The quick brown fox jumps over the lazy dog" << flush; // length == 43 cout << "123456789 "; flush(fos); // no effect? return 0; // prints "The quick brown fox jumps over the lazy 123456789 dog" // last 3 bytes "dog" are printed when fos goes out of scope } Darren Kessner Scientific Programmer Darren.Kessner(a)cshs.org Spielberg Family Center for Applied Proteomics Cedars-Sinai Medical Center http://www.sfcap.cshs.org/ IMPORTANT WARNING: This message is intended for the use of the person or entity to which it is addressed and may contain information that is privileged and confidential, the disclosure of which is governed by applicable law. If the reader of this message is not the intended recipient, or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this information is STRICTLY PROHIBITED. If you have received this message in error, please notify us immediately by calling (310) 423-6428 and destroy the related message. Thank You for your cooperation.

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Bjam Build Modes
by Colin Diesh 29 Dec '07

29 Dec '07

I am trying to build a boost library and I would get the error from the auto linker Error 2 fatal error C1189: #error : "Mixing a dll boost library with a static runtime is a really bad idea..." c:\bin\boost 1.34.1\boost\config\auto_link.hpp 287 So I changed to a multithreaded dll runtime and I get the error Error 1 fatal error LNK1104: cannot open file 'boost_log-vc80-mt-gd-1_34_1.lib' But when I build my boost library bjam /boost/xxx/build/ It creates a hierarchy like c:\bin\boost 1.34.1\bin.v2 └───libs └───xxx └───build └───msvc-8.0express └───debug └───link-static ........................... libboost_xxx-vc80-gd-1_34_1.lib ........................... libboost_xxx-vc80-gd-1_34_1.lib.rsp Clearly, I did not have the multithreaded versions, and I can not figure out what options, what definitions, what anything, to build all install stage or whatever The Jamfile is overtly simple project boost/xxx; : requirements <include>$(BOOST_ROOT) <link>static <link>shared:<define>BOOST_LOG_SOURCE : usage-requirements <link>shared:<define>BOOST_DATE_TIME_DYN_LINK=1 : source-location ../src ; LOG_SOURCES = blah blah blah; lib boost_xxx : ../src/$(LOG_SOURCES).cpp ; ____________________________________________________________________________________ Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping

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[python] Errors on build Boost.Python with ICL 8.1
by Mazay 29 Dec '07

29 Dec '07

Hello, all. I have encountered compile errors on attempt to add Python support to an existing boost installation. Configuration: boost 1.33.1 Intel C++ Compiler 8.1.018 for Windows Python 2.5 // --------Build script (icc_python.bat): ------------- SET INTEL_BASE_MSVC_TOOLSET=vc-7_1 SET TOOLS=intel-win32 SET INTEL_PATH=c:\Install\Intel\CPP\Compiler80\Ia32 SET INTEL_VERSION=81 SET PYTHON_VERSION= 2.5 SET PYTHON_ROOT=C:\Install\Python25 bjam --prefix=C:\prg\boost --with-python install 1>icc_python.log 2>icc_python.err //----- end of build script --------- The following errors occur: C:\prg\boost_1_33_1\boost/python/converter/pyobject_traits.hpp(33): error: expression must have a constant value BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Type); ^ detected during instantiation of class "boost::python::converter::pyobject_traits<PyTypeObject>" at line 33 C:\prg\boost_1_33_1\boost/python/converter/pyobject_traits.hpp(34): error: expression must have a constant value BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(List); ^ detected during instantiation of class "boost::python::converter::pyobject_traits<PyListObject>" at line 34 C:\prg\boost_1_33_1\boost/python/converter/pyobject_traits.hpp(35): error: expression must have a constant value BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Int); ^ detected during instantiation of class "boost::python::converter::pyobject_traits<PyIntObject>" at line 35 ..................... and so on .......... I've made some investigation of the issue. The error occur in file pyobject_traits.hpp in this code: # define BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(T) \ template <> struct pyobject_traits<Py##T##Object> \ : pyobject_type<Py##T##Object, &Py##T##_Type> {} // This is not an exhaustive list; should be expanded. BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Type); //line 33 BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(List); //line 34 BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Int); //line 35 BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Long); BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Dict); BOOST_PYTHON_BUILTIN_OBJECT_TRAITS(Tuple); Variables PyType_Type, PyList_Type, PyInt_Type and etc has type PyTypeObject and defined in Python include files in the following way: PyAPI_DATA(PyTypeObject) PyList_Type; PyAPI_DATA is a macro. In this case it unrolls in the code: extern __declspec(dllimport) PyTypeObject PyList_Type; So we have the following code after preprocessing: extern __declspec(dllimport) PyTypeObject PyList_Type; template <> struct pyobject_traits<PyListObject> : pyobject_type<PyListObject, &PyList_Type> {}; and it causes error: expression must have a constant value I tried to explicitly change PyList_Type declaration to: extern __declspec(dllimport) const PyTypeObject PyList_Type; but it didn't change anything. Google didn't tell me anything useful so this list is my last resort. Please, help. Best regards, Ded Mazay.

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Problem with Math Toolkit
by Michael S 28 Dec '07

28 Dec '07

I have found online documentation for a new version of the Math Toolkit, dedicated to Statistical Distributions and Functions (the link to the documentation is: http://freespace.virgin.net/boost.regex/toolkit/html/index.html ). Apparently this version was reviewed back in April 2007 (see http://archives.free.net.ph/message/20070411.155456.8e65c9d8.en.html) Unfortunately, these functions are not included in the latest distribution of Boost available online, and are not in the Boost Vault. Does anyone know where can I get them? Thanks! Michael _________________________________________________________________ i’m is proud to present Cause Effect, a series about real people making a difference. http://im.live.com/Messenger/IM/MTV/?source=text_Cause_Effect

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[Boost.Spirit] problem with parsing
by Michał Nowotka 28 Dec '07

28 Dec '07

Hello, I'm currently writing simple server implementation and want to parse GET request header and load passed attributes. I though with boost spirit this will be very simple task but i got some errors I can't understand. My function (these are my first lines of code using spirit): bool GET_parse(std::string &str, std::vector<std::string> &keys, std::vector<std::string> &values) { using namespace boost::spirit; uint_parser<unsigned,10,1,1> my_digit; rule<> request,method,path,version_id,stri,web_sign,attribs; request = method >> path >> version_id; method = as_lower_d["get"];//method = str_p["GET"]; version_id = str_p("HTTP") >> ch_p('/') >> my_digit >> ch_p('.') >> my_digit; path = ch_p('/') >> !(stri >> *(ch_p('/') >> stri) >> !(ch_p('?') >> attribs)); stri = +(web_sign); web_sign = alnum_p | ch_p('_') | ch_p('_') | ch_p('.'); attribs = *((+alnum_p)[push_back_a(keys)] >> ch_p('=') >> (+alnum_p)[push_back_a(values)] >> !ch_p('&')); return parse(str.c_str(), request, space_p).full; } and output (for me totally unreadable): In member function 'typename boost::spirit::parser_result<DerivedT, ScannerT>::type boost::spirit::impl::rule_base<DerivedT, EmbedT, T0, T1, T2>::parse_main(const ScannerT&) const [with ScannerT = boost::spirit::scanner<const char*, boost::spirit::scanner_policies<boost::spirit::skipper_iteration_policy<boost::spirit::iteration_policy>, boost::spirit::match_policy, boost::spirit::action_policy> >, DerivedT = boost::spirit::rule<boost::spirit::nil_t, boost::spirit::nil_t, boost::spirit::nil_t>, EmbedT = const boost::spirit::rule<boost::spirit::nil_t, boost::spirit::nil_t, boost::spirit::nil_t>&, T0 = boost::spirit::nil_t, T1 = boost::spirit::nil_t, T2 = boost::spirit::nil_t]': /usr/include/boost/spirit/core/non_terminal/impl/rule.ipp:171: instantiated from 'typename boost::spirit::parser_result<DerivedT, ScannerT>::type boost::spirit::impl::rule_base<DerivedT, EmbedT, T0, T1, T2>::parse(const ScannerT&) const [with ScannerT = boost::spirit::scanner<const char*, boost::spirit::scanner_policies<boost::spirit::skipper_iteration_policy<boost::spirit::iteration_policy>, boost::spirit::match_policy, boost::spirit::action_policy> >, DerivedT = boost::spirit::rule<boost::spirit::nil_t, boost::spirit::nil_t, boost::spirit::nil_t>, EmbedT = const boost::spirit::rule<boost::spirit::nil_t, boost::spirit::nil_t, boost::spirit::nil_t>&, T0 = boost::spirit::nil_t, T1 = boost::spirit::nil_t, T2 = boost::spirit::nil_t]' /usr/include/boost/spirit/core/scanner/impl/skipper.ipp:131: instantiated from 'static boost::spirit::parse_info<IteratorT> boost::spirit::impl::phrase_parser<boost::spirit::space_parser>::parse(const IteratorT&, const IteratorT&, const ParserT&, const boost::spirit::space_parser&) [with IteratorT = const char*, ParserT = boost::spirit::rule<boost::spirit::nil_t, boost::spirit::nil_t, boost::spirit::nil_t>]' /usr/include/boost/spirit/core/scanner/impl/skipper.ipp:153: instantiated from 'boost::spirit::parse_info<IteratorT> boost::spirit::parse(const IteratorT&, const IteratorT&, const boost::spirit::parser<DerivedT>&, const boost::spirit::parser<SkipT>&) [with IteratorT = const char*, ParserT = boost::spirit::rule<boost::spirit::nil_t, boost::spirit::nil_t, boost::spirit::nil_t>, SkipT = boost::spirit::space_parser]' /usr/include/boost/spirit/core/scanner/impl/skipper.ipp:171: instantiated from 'boost::spirit::parse_info<const CharT*> boost::spirit::parse(const CharT*, const boost::spirit::parser<DerivedT>&, const boost::spirit::parser<SkipT>&) [with CharT = char, ParserT = boost::spirit::rule<boost::spirit::nil_t, boost::spirit::nil_t, boost::spirit::nil_t>, SkipT = boost::spirit::space_parser]' serwer_www.cpp:52: instantiated from here /usr/include/boost/spirit/core/non_terminal/impl/rule.ipp:189: error: no matching function for call to 'boost::spirit::impl::abstract_parser<boost::spirit::scanner<const char*, boost::spirit::scanner_policies<boost::spirit::iteration_policy, boost::spirit::match_policy, boost::spirit::action_policy> >, boost::spirit::nil_t>::do_parse_virtual(const boost::spirit::scanner<const char*, boost::spirit::scanner_policies<boost::spirit::skipper_iteration_policy<boost::spirit::iteration_policy>, boost::spirit::match_policy, boost::spirit::action_policy> >&)' /usr/include/boost/spirit/core/non_terminal/impl/rule.ipp:213: note: candidates are: typename boost::spirit::match_result<ScannerT, AttrT>::type boost::spirit::impl::abstract_parser<ScannerT, AttrT>::do_parse_virtual(const ScannerT&) const [with ScannerT = boost::spirit::scanner<const char*, boost::spirit::scanner_policies<boost::spirit::iteration_policy, boost::spirit::match_policy, boost::spirit::action_policy> >, AttrT = boost::spirit::nil_t] can you tell me where my code is wrong and why? -- Cheers, Michał Nowotka

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[review] Formal Fast-Track review of the Boost.Functional/Factory library begins today
by John Torjo 28 Dec '07

28 Dec '07

Hi all, Today starts the formal Fast-Track review of the Boost.Functional/Factory library. *Description* Factories are callback mechanisms for constructors, so we provide two function objects, boost::value_factory and boost::factory, that encasulate object construction through direct application of the constructor or operator new, respectively. These templates make other facilities that operate on function objects (such as standard algorithms, Boost.Bind, Boost.Function, or Fusion functional adapters) applicable to constructors. *Author* Tobias Schwinger *Download* Get it from here: http://www.boost-consulting.com/vault/index.php?action=downloadfile&filenam… Read documentation online here: http://torjo.com/tobias/ What to include in Review Comments ================================== Your comments may be brief or lengthy, but basically the Review Manager needs your evaluation of the library. If you identify problems along the way, please note if they are minor, serious, or showstoppers. Here are some questions you might want to answer in your review: * What is your evaluation of the design? * What is your evaluation of the implementation? * What is your evaluation of the documentation? * What is your evaluation of the potential usefulness of the library? * Did you try to use the library? With what compiler? Did you have any problems? * How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? * Are you knowledgeable about the problem domain? And finally, every review should answer this question: * Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion. Best, John Torjo - Review Manager - -- http://John.Torjo.com -- C++ expert ... call me only if you want things done right

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[boost-users] [iterator_range simple question]
by chun ping wang 28 Dec '07

28 Dec '07

Does iterator_range modify the copy of the iterator (like creates a new copy) and modifys it when you modify items in iterator range or the actual container itself. ..?

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Re: [Boost-users] [multi_index] passing 'cons t TYPE' as 'this' argument discards qualifiers
by damny＠web.de 28 Dec '07

28 Dec '07

hi joaquín, now it works. thank you. > > are there possibilities to avoid the 'std::string' for the 'name' > > key? > > I'm not getting this question. Could you please elaborate? i would like to know if it is possible to use char[] or char* as an alphanumeric key value and not std::string. improper tests didn't work. daniel > ----- Mensaje original ----- > De: damny(a)web.de > Fecha: Martes, Diciembre 25, 2007 5:17 pm > Asunto: [Boost-users] [multi_index] passing 'cons t TYPE' as 'this' > argument discards qualifiers > Para: boost-users(a)lists.boost.org > > > merry xmas everyone, > > Merry Xmas :) > > [...] > > class cClass { > > private: > > int att1; > > public: > > std::string nme; // name > > int idf; // identifier > > cClass(); > > cClass(std::string nme, int idf); > > int get_attribute(); > > }; > > > [...] > > mMapByNme::iterator itrNme = locMsg.get<0>().find("name1"); > > mMapByIdf::iterator itrIdf = locMsg.get<1>().find(456); > > printf( "att1 = %d\n", itrNme->get_attribute() ); > [...] > > main.cpp: In function `int main()': > > main.cpp:33: error: passing 'const cClass' as 'this' argument of > > 'int cClass::get_attribute()' discards qualifiers > > Process terminated with status 1 (0 minutes, 20 seconds) > > > > any hints how to solve the problem? > > The problem here is that elements of a multi_index_container > are immutable, and the iterators ony grant const access > to them. In this regard, the behavior is the same as that > of a regular std::set. To solve your particular problem you can > const-qualify the offending member function: > > int get_attribute() const; > > > how to encapsulate this special multi_index into a class, that > > fits the above description of the needed 'map'. > > You should probably consider whether Boost.Bimap could > be a better approach, but I see you're already discussing > this issue with Matías. > > > are there possibilities to avoid the 'std::string' for the 'name' > > key? > > I'm not getting this question. Could you please elaborate? > > > where are the more easier examples for C++-templates/boost > > newbies like me :o) ? > > HTH, > > Joaquín M López Muñoz > Telefónica, Investiación y Desarrollo > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > __________________________________________________________________________ Erweitern Sie FreeMail zu einem noch leistungsstärkeren E-Mail-Postfach! Mehr Infos unter http://produkte.web.de/club/?mc=021131

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Re: [Boost-users] [multi_index] passing 'const TYPE' as 'this' argument discards qualifiers
by damny＠web.de 28 Dec '07

28 Dec '07

hello matias, i hope i can test boost.bimap today. therefor the last days were a little bit to stressful. although i thank you very much for your help. see you soon, daniel _____________________________________________________________________ Der WEB.DE SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! http://smartsurfer.web.de/?mc=100071&distributionid=000000000066

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Unable to build python/example/tutorial from 1_34_1 in Windows XP with MSVC 8.0
by Andres Corrada-Emmanuel 28 Dec '07

28 Dec '07

Hello, I've been scouring the internet and boost.org documentation to do what I thought was a relatively simple task on Windows XP with MSVC 8.0: build and import into python the hello.cpp example in the 1_34_1 distribution. Warts: - The Jamroot file in the tutorial folder lacks the "import python ;" command. - No matter what I tried, bjam.exe, could not find the boost_python-vc80-mt-1_34_1.lib file. I finally gave up and copied it directly into the tutorial directory. - bjam compiled the hello.pyd but no "boost_python.dll" as the documentation for the Hello World example said it would. Has this changed? - Importing this hello.pyd fails even when I am in the same directory as the file fails. Do I need to have the boost_python.dll in the same directory? How do I create it with bjam? Is the tutorial directory broken? my bjam.exe? Any help would be appreciated. Particularly any pointers on how to debug my problems (bjam.exe --debug-configuration was not helpful in solving any of the boost_python lib import problems). -- Andres Corrada-Emmanuel Research Fellow Aerial Imaging and Remote Sensing Lab Computer Science Department University of Massachusetts at Amherst Blog: www.corrada.com/blog

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