February 2007 - Boost-users

help with boost::bind and boost::regex
by Polder, Matthew J 01 Feb '07

01 Feb '07

I am trying to do the following: std::vector< std::string > filenames; //list of filenames retrieved using filesystem boost::regex r(".*txt$"); std::vector< std::string >::const_iterator iter = std::find_if( filenames.begin(), filenames.end(), boost::bind(boost::regex_match, _1, r) ); //Doesn't compile. I'm trying to find strings that match (or don't match) a particular regular expression. Help in properly using boost::bind and negating it would be helpful. thanks, matthew

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Build only static library with -fPIC option.
by Bo Peng 01 Feb '07

01 Feb '07

Dear list, I am building boost cvs. For my specific application, I need to build only static libraries with -fPIC option. I tried command > bjam -j4 --prefix=/usr "-sBUILD=release <runtime-link>static <cxxflags>-fPIC" --with-serialization --with-iostreams install But I still get .a and .so libraries under /usr/lib. I used -n option (an advise I get from one of my previous posts) and the building commands are like: "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -c -o "bin.v2/libs/serialization/build/gcc-3.4.6/release/link-static/binary_wiarchive.o" "libs/serialization/src/binary_wiarchive.cpp" so no -fPIC is passed. I tried bjam -h, but get even more confused because I am told.. -n Don't actually execute the updating actions. I guess cvs/bjam handles these options totally differently than boost 1.33.1, but how can I get the latest information? Many thanks in advance. Bo

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[bind] how to get the type after bind
by hongleij＠126.com 01 Feb '07

01 Feb '07

//my question is how to write the type ??? below to make it run . #include <boost/bind.hpp> #include <iostream> using boost::bind; void print() { std::cout <<" print" << std::endl; } template <class T> void func(T t) { std::cout <<"func1(T t) : " ; t(); } int main() { func(bind(&print)); //ok bind ( &func<???>, bind(&print) ) ; //don't know how to write it }

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Re: [Boost-users] [bind] how to get the type after bind
by Nat Goodspeed 01 Feb '07

01 Feb '07

________________________________________ From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of hongleij(a)126.com Sent: Thursday, February 01, 2007 9:00 AM To: boost-users(a)lists.bo... Subject: [Boost-users] [bind] how to get the type after bind //my question is how to write the type ??? below to make it run . #include <boost/bind.hpp> #include <iostream> using boost::bind; void print() { std::cout <<" print" << std::endl; } template <class T> void func(T t) { std::cout <<"func1(T t) : " ; t(); } int main() { func(bind(&print)); //ok bind ( &func<???>, bind(&print) ) ; //don't know how to write it } [Nat] This doesn't directly answer your question; the type produced by bind() is obscure. But would the following suit your need? bind ( &func< boost::function<void ()> >, bind(&print) ) ;

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[boost-thread] why not writ e "sleep" in a better
by hongleij＠126.com 01 Feb '07

01 Feb '07

hi: it really a trouble thing for me to use boost::thread::sleep() : boost::xtime helloworldtime; boost::xtime_get(&helloworldtime, boost::TIME_UTC); helloworldtime.sec += 6; boost::thread::sleep(helloworldtime); i think "boost::thread::sleep(1500) //millisecond " may easy my programming;if have such interface; now i use : void thread_sleep(unsigned int interval) //millisecond { boost::xtime xt; boost::xtime_get(&xt, boost::TIME_UTC); int sec=interval/1000; int msec=interval-1000*sec; xt.nsec += 1000*1000*msec; xt.sec+= sec; boost::thread::sleep(xt); } best wishes;-)

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mapped_file_sink
by Alf Kraus 01 Feb '07

01 Feb '07

does anyone have an example of using *mapped_file_sink *to create and write into a memory mapped file?

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mapped_file_sink
by Alf Kraus 01 Feb '07

01 Feb '07

I'm trying to create memory mapped files using mapped_file_sink: mapped_file_params mfParams( fileName ); mfParams.new_file_size = filesize; mapped_file_sink mfSink( mfParams ); trying to use any of its funtions like: const char *ptStart = mfSink.data(); the compiler tells me that I have no access to them for they are private members since inherited from mapped_file I know thats a piece of cake but just cant solve it. Cheers Alf

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problem with boost/iterator/zip_iterator.hpp
by Tim Axelrod 01 Feb '07

01 Feb '07

Hello, If more than one source file includes boost/iterator/zip_iterator.hpp, the loader complains about a multiply defined function: tsa@mops2.lsstcorp.org:~/VW/TSA> g++ -o nothing nothingMain.cc nothing.cc /tmp/ccT5Bn0N.o: In function `boost::detail::tuple_impl_specific::tuple_equal(boost::tuples::null_type, boost::tuples::null_type)': nothing.cc:(.text+0x0): multiple definition of `boost::detail::tuple_impl_specific::tuple_equal(boost::tuples::null_type, boost::tuples::null_type)' /tmp/ccH8Z9eR.o:nothingMain.cc:(.text+0x0): first defined here collect2: ld returned 1 exit status I'm using boost_1_33_1. The source files are attached. Regards, Tim Axelrod

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