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Using boost on msvc, having bjam link trouble with simple build
by Rod Morison 09 Aug '06

09 Aug '06

Mostly a bjam question: With bjam the link command is not finding the boost libs...I need help with the build setup: I built successfully and headers & libs are in C:\Boost... /Boost/include/boost-1_33_1/boost/... /Boost/lib/... I'm running Boost.Build from the boost-build-2.0-m11.tar.bz2 in c:\boost-build In building a small Boost.Threads app I get % bjam ...patience... ...found 258 targets... ...updating 2 targets... compile-c-c++ bin\msvc\debug\CreateThread.obj CreateThread.cpp msvc.link bin\msvc\debug\CreateThread.exe LINK : fatal error LNK1104: cannot open file 'libboost_thread-vc71-mt-gd-1_33_1.lib' ...updated 2 targets... My boost-build.jam is boost-build c:\\boost-build ; and my Jamroot is project : requirements <include>c:/Boost/include/boost-1_33_1 ; exe CreateThread : CreateThread.cpp ;

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[Signals] Newbie to understand boost-signal
by CG 09 Aug '06

09 Aug '06

Hi all, I am doing some research to use boost-signals library. I was reading the Tutorial of boost-signals library and have tested the Documents-View example , and understand the basic to use it. In the tutorial , there is a template function named visit_each , I suppose it is a iteration function to iterate all the slots or signals . However, there is not much information about how to use visit_each. I try to look into source code but as a newbie in template programming I really could not understand the source code. I wonder the creator of signal library have done some update on the tutorial and add in example on visit_each or other new interface/function Besides, apart from what mentioned in the tutorial, what are the benefit if a class is derived from trackable ? Sorry if my question are a bit weird.

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Building PDF format of Boost Documentation failed
by Ryo IGARASHI 09 Aug '06

09 Aug '06

Hi, I tried to build the PDF documentation of boost libraries. However, When I run bjam ordinary way, pdf build stopped with attached error. * HTML documentations are built correctly * CVS HEAD and RC_1_34_0 also failed What is the reason of this failure? /usr/local/src/boost/doc $ bjam --v2 pdf The following software version was used . OS: Debian GNU/Linux (sid/unstable) XSLTPROC: libxml 20626, libxslt 10117 and libexslt 813 (Using Debian official package "xsltproc" 1.1.17-2) DOXYGEN: 1.4.7 (Using Debian official package "doxygen" 1.4.7-1) JAVA: Sun Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_07-b03) (Using Debian official package "sun-java5-bin" 1.5.0-07-1) FOP: Apache FOP 0.20.5 (Using Debian official package "fop" 0.20.5-8) Boost: CVS HEAD/RC_1_34_0 My user_config.jam is also attached at the end. -- Ryo IGARASHI rigarash(a)gmail.com

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[boost][array] Multi-dimensional initialization
by Michael Marcin 09 Aug '06

09 Aug '06

At least under MSVC 8 I can do: boost::array< boost::array<int,2>, 4 > foo = { -1,1, 0,0, 1,-1, 2,-2 }; or int foo[4][2] = { {-1,1}, {0,0}, {1,-1}, {2,-2} }; or boost::array<int,2> foo[4] = { {-1,1}, {0,0}, {1,-1}, {2,-2} }; but not boost::array< boost::array<int,2>, 4 > foo = { {-1,1}, {0,0}, {1,-1}, {2,-2} }; just wondering why this is the case.

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format precision specifiers and strings
by Jason Nye 09 Aug '06

09 Aug '06

Hello all, I'm having trouble with boost format and precision specifiers with strings. The problem is that if I don't specify the 's' in the format string, a precision specifier does not truncate the string as I would expect: format("%.4s") % some_string The above will truncate some_string to the first four chars. format("%|.4s|") % some_string Same thing. However, the following does not truncate: format("%|.4|") % some_string This is confusing because the biggest boon to using boost::format for me is that the type specifier is (I thought) unnecessary. I would think that format would see the .4 and use that as precision if a floating point value was provided and use it as the length of the string if a string was provided. Is this a bug or is this the intended behavior? Thanks! Jason. If you have a procedure with ten parameters, you probably missed some. --Alan Perlis

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random number generator 160 bit.
by chun ping wang 09 Aug '06

09 Aug '06

Hi, I have a question how would i use boost to generate a 160 bit random integer. Heres the random number generator i wrote thanks to some of the boost community help. #ifndef RANDOM_NUMBER_HPP #define RANDOM_NUMBER_HPP #include <boost/random/shuffle_output.hpp> #include <boost/random/mersenne_twister.hpp> #include <boost/random/uniform_int.hpp> #include <boost/random/variate_generator.hpp> #include <Windows.h> #ifdef _linux_ #include <boost/nondet_random.hpp> #endif #include <boost/cast.hpp> // credit and thanks to Andrew Holden for help on this. namespace Random { typedef boost::kreutzer1986 base_generator_type; // typedef boost::mt19937 base_generator_type; typedef boost::uniform_int<> distribution_type; typedef boost::variate_generator<base_generator_type&, distribution_type> gen_type; // boost::random_device nondet_generator; //Declare the generator as a global variable for easy reuse #ifdef __linux__ boost::random_device dev; base_generator_type generator(dev()); #else base_generator_type generator(GetTickCount()); #endif /*************************************************** * initializes the random number generator * **************************************************/ void initialize() { for (int i = 0; i < 900; ++i) { #ifdef __linux__ generator.seed(dev()); #else generator.seed(GetTickCount()); #endif } } /*************************************************** * generates a random number between a and b * * @param a the starting range * * @param b the integer ending range * * @return N such that a <= N <= b * **************************************************/ template <class T> T randint (const T& a, const T& b) { //Check the parameters BOOST_STATIC_ASSERT(boost::is_integral<T>::value); assert (b >= a); //Set up the desired distribution gen_type ran_gen(generator, distribution_type(a, b)); //Get a random number return ran_gen(); } } #endif /* RANDOM_NUMBER_HPP */ Heres a code to generate random prime number. /*************************************************** * n <- random number with num_digits digits * * if n is even then n = n + 1; * * while is_prime(n, 150) * * { * * n = n + 2; * * } * * return n; * ***************************************************/ template <typename T> T boost::random_prime(boost::function<bool(const T&, const T&)> f, const unsigned int& num_digits) { BOOST_STATIC_ASSERT(is_integral<T>::value); T n(Random::randint<T>(numeric_cast<T>(pow(2.0, num_digits - 1)), numeric_cast<T>(pow(2.0, num_digits))) ); if (n%2 == 0) { ++n; } while (f(n, 20)) { n += 2; } return n; } now num_digits is number of bits. If i pass 160 bit as like for DSA algorithm the program crashes. I pass 8 and it works, how come? Is there a better way to do this? Oh f is any function that can deteremine if a number is most likely a prime or not.... Thanks.

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regex users question
by gast128 09 Aug '06

09 Aug '06

Dear all, I want to misuse boost regex for pattern searching. The intermediate form will then be a string, but some of its characters can have multiple values, e.g: aaa aba aac abc Thus the string can be represented as a[a,b][a,c]. Still on this multiple string representation I want the full power of regular expressions, so I still want to search for aaa, or (a|b)* etc. Is it possible to create some sort of adjusted string and overload the operator== ? I know that as alternative I can adjust the matching string, but this would be a fallback. Wkr, me

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[program_options] strange assertions
by Ovanes Markarian 09 Aug '06

09 Aug '06

Hi! I use MS VC8.0 (2005) Express Edition. This code sample causes the following assertion: int main(int argc, char* argv[]) { options_description generic("Generic options"); generic.add_options() ("version,v", "print version string") ("help,h", "produce help message") ; // Declare a group of options that will be // allowed both on command line and in // config file options_description config("Configuration"); config.add_options() ("worker-threads,w", po::value<int>()->default_value(20), "Each worker thread starts parsing of one file.\ndefault: 20") ; options_description cmdline_opt, cfgf_opt; cmdline_opt.add(generic).add(config); cfgf_opt.add(config); variables_map vm; store(command_line_parser(argc, argv).options(cmdline_opt).run(), vm); ifstream ifs("scanning_options.cfg"); store(parse_config_file(ifs, cfgf_opt), vm); notify(vm); if(vm.count("help")) cout << config << endl; //... some other code return 0; } In this line: cout << config << endl; I receive an assertion: Debug Assertion Failed! Program: e:\projects\...\protocol_scanner.exe File: e:\program files\microsoft visual studio 8\vc\include\xstring Line: 173 Expression: ("_Myptr + _Off <= (((_Mystring *)this->_Mycont)->_Myptr() + ((_Mystring *)this->_Mycont)->_Mysize) && _Myptr + _Off >= ((_Mystring*)this->_Mycont)->_Myptr()",0) ... line 173 is part of a function in xstring _Myt& __CLR_OR_THIS_CALL operator+=(difference_type _Off) { // increment by integer if (this->_Mycont != _IGNORE_MYCONT) { _SCL_SECURE_VALIDATE(this->_Mycont != NULL); _SCL_SECURE_VALIDATE_RANGE( _Myptr + _Off <= (((_Mystring *)this->_Mycont)->_Myptr() + ((_Mystring *)this->_Mycont)->_Mysize) && _Myptr + _Off >= ((_Mystring *)this->_Mycont)->_Myptr()); // <- line 173 } _Myptr += _Off; return (*this); } Output in stdout window looks like: Generic options: -v [ --version ] print version string -h [ --help ] produce help message Configuration: -w [ --worker-threads ] arg (=20) -------------------------^^^^^^^^^^ this looks really weired!!! Here should be another message. Last line is really weired... Stack trace is: > protocol_scanner.exe!std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char> >::operator+=(int _Off=-1) Line 171 + 0x78 bytes C++ protocol_scanner.exe!std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char> >::operator-=(int _Off=1) Line 188 C++ protocol_scanner.exe!std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char> >::operator-(int _Off=1) Line 193 + 0xc bytes C++ protocol_scanner.exe!boost::program_options::`anonymous namespace'::format_paragraph(std::basic_ostream<char,std::char_traits<char> > & os={...}, std::basic_string<char,std::char_traits<char>,std::allocator<char> > par="Each worker thread starts parsing of one file.", unsigned int first_column_width=36, unsigned int line_length=79) Line 381 + 0x28 bytes C++ protocol_scanner.exe!boost::program_options::`anonymous namespace'::format_description(std::basic_ostream<char,std::char_traits<char> > & os={...}, const std::basic_string<char,std::char_traits<char>,std::allocator<char> > & desc="Each worker thread starts parsing of one file.\ndefault: 20", unsigned int first_column_width=36, unsigned int line_length=79) Line 453 + 0x34 bytes C++ protocol_scanner.exe!boost::program_options::`anonymous namespace'::format_one(std::basic_ostream<char,std::char_traits<char> > & os={...}, const boost::program_options::option_description & opt={...}, unsigned int first_column_width=36, unsigned int line_length=80) Line 489 + 0x1a bytes C++ protocol_scanner.exe!boost::program_options::options_description::print(std::basic_ostream<char,std::char_traits<char> > & os={...}) Line 522 + 0x1e bytes C++ protocol_scanner.exe!boost::program_options::operator<<(std::basic_ostream<char,std::char_traits<char> > & os={...}, const boost::program_options::options_description & desc={...}) Line 289 C++ protocol_scanner.exe!boost::program_options::options_description::print(std::basic_ostream<char,std::char_traits<char> > & os={...}) Line 528 + 0x34 bytes C++ protocol_scanner.exe!boost::program_options::operator<<(std::basic_ostream<char,std::char_traits<char> > & os={...}, const boost::program_options::options_description & desc={...}) Line 289 C++ protocol_scanner.exe!main(int argc=2, char * * argv=0x00353980) Line 128 + 0x13 bytes C++ Parameter of executable is: --help With Kind Regards, Ovanes Markarian

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Embedded development
by Michael Marcin 09 Aug '06

09 Aug '06

I've used boost (although very lightly) on Windows Mobile 5 via Visual Studio 2005. I've heard that Brew and Symbian could not in the past support boost because they had no static writeable data. Recently however with Series 60 v3/Symbian 9.1 and Brew elf2mod writeable static data is available on these platforms. Has anyone used boost on these platforms (ie Brew/Symbian/WM5)? What parts of boost are likely to work on these platforms? What parts of boost are likely to fail on these platforms? Thanks

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Re: [Boost-users] regex users question
by james.jones＠firstinvestors.com 09 Aug '06

09 Aug '06

From: Roman Neuhauser <neuhauser(a)sigpipe.cz> > If so, what are you envisioning to construct those objects with > if not regular expression literals? You'll end up using > regex_match() in operator==() anyway, so again, what's the question > exactly? I suggest that the fundamental problem to be solved here is: given regular expressions X and Y, can some string matching X completely be a substring match for Y? In general, this sounds hard. Can we do better than brute-force (i.e. generating every possible string for X and checking it against Y)? The brute-force solution is obviously exponential-time (or infinite-time!) in worst-case, so something better would be nice. I doubt a few simple changes to boost::regex would solve it. - James Jones Administrative Data Mgmt. Webmaster 375 Raritan Center Pkwy, Suite A Data Architect Edison, NJ 08837

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