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Statically linking libstdc++.so.6 and boost
by Michael Dehmlow 08 May '09

08 May '09

I have a rather interesting situation and I'm wondering if any one has some ideas. I am building a linux shared library which uses boost and xerces, I have an application which I compile and run fine using gcc 4.1 which uses stdlibc++.so.6. I also have a requirement to create an interface for Labview 8.6 which is built using gcc 3.3 which uses stdlibc++.so.5. After some investigation I found that Labview would crash on any std::string concatenation because it was dynamically using the old stdlib(5). In a simplified test tool I statically linked the stdc++ lib using this really great page: http://www.trilithium.com/johan/2005/06/static-libstdc/ Everything worked great until I started adding my cots (boost and xerces) into the mix. For xerces I simply modified the xerces make file to statically link stdlib and (using gdb was able determine that) I get past all my xerces calls. However when I make call to boost lexical cast it still tries to use the dynamic std library 5: #0 0x00cab1a7 in std::string::data () from /usr/lib/libstdc++.so.5 #1 0x0362b479 in boost::detail::lexical_cast<int, std::string, false, char> (arg=@0x0, buf=0x0, src_len=0) at /usr/include/boost/boost_1_38_0/boost/lexical_cast.hpp:1149 #2 0x0362b500 in boost::detail::lexical_cast<int, std::string, false, char> (arg=Cannot access memory at address 0x8 ) at /usr/include/boost/boost_1_38_0/boost/lexical_cast.hpp:1159 Above is the stack trace immediately preceding my segmentation fault. One: I thought that lexical cast was built into hpp files and was compiled at my application compile time is that correct? Two: does any one know how to make the symbols from a .a (static library) file look in the encapsulating so's symbol table before the applications symbol table? Or can anyone point me at some information on symbol lookup precedence. Three: I'm considering including all of the generated object files from the included boost .a files in my make file rather than including the staticboost libraries themselves. Seem like a good idea? Any pitfalls? Four: any other Ideas? Below is the meat of my make file: g++ -g -static-libgcc -nodefaultlibs -fPIC -shared -fno-gnu-linker -Wl,-soname,libEXPO.so -o libEXPO.so ${APIOBJECTS} ${DETAILOBJECTS} ${OBJECTS} -L. -L../../../utl/CommonObjects/XML/ -L../../../utl/CommonObjects/Exceptions ${COTS_EXPO_BOOST_LIBDIR_38}/libboost_thread-gcc41-mt-1_38.a ${COTS_EXPO_BOOST_LIBDIR_38}/libboost_filesystem-gcc41-mt-1_38.a ${COTS_EXPO_BOOST_LIBDIR_38}/libboost_system-gcc41-mt-1_38.a ${COTS_EXPO_BOOST_LIBDIR_38}/libboost_regex-gcc41-mt-1_38.a ${COTS_EXPO_BOOST_LIBDIR_38}/libboost_date_time-gcc41-mt-1_38.a ./libxerces-c.so.26 -lXML -lExceptions -lc /lib/libpthread.so. -- View this message in context: http://www.nabble.com/Statically-linking-libstdc%2B%2B.so.6-and-boost-tp234… Sent from the Boost - Users mailing list archive at Nabble.com.

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[test] Crash when running my unit tests
by Christian Henning 08 May '09

08 May '09

Hi there, when I try to run my tests the unit testing framework seems to crash for no apparent reason. The point it's crashing is in unit_test_suite.ipp[263]. It seems to crash before entering the first test. The c++ runtime at this points tries to delete the memory of a string which triggers the assertion. _ASSERTE(_BLOCK_TYPE_IS_VALID(pHead->nBlockUse)); Here is my scenario: Everything used to run just fine before I added a new file containing more tests. Meaning all of my tests are scattered around a couple of files ( 20 files ) which sum up to about 120 tests. I don't think that this usage is anything but exceptional. When I exclude the new test file the tests are running fine. When including the new test file it crashes. I'm running the boost trunk on a windows xp using MSVC 2005. Anyone any idea what I can do about this? My code is available here: http://gil-contributions.googlecode.com/svn/trunk/ The tests are here: http://gil-contributions.googlecode.com/svn/trunk/gil_2/libs/gil/io_new/tes… Any help is more than welcome. Thanks ahead, Christian

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Unique parameter values for interfaces
by Ryan McConnehey 08 May '09

08 May '09

I'm currently trying to fortify my class api by "make interfaces easy to use correctly and hard to use incorrectly". I have a class as follows. class api { api(ConfigName const& configName_, PathName const& pathName_) : m_ConfigName(configName_.value) , m_PathName(pathName_.value) {} std::string m_ConfigName; std::string m_PathName; }; Both ConfigName and PathName are typedef to a template structure as follows. template<typename S> struct ParameterValue { ParameterValue(S value_) : value(value_) {} S value }; typedef ParameterValue<std::string> ConfigName; typedef ParameterValue<std::string> PathName; I realized later that this method doesn't prevent the swapping of a ConfigName with a PathName parameter. Since both parameters are typedef to the same "type" of ParameterValue they're interchangeable. Is there a boost class, library or C++ idiom that would provide what I'm looking for? Since I'm going to be using this concept for other classes I build, I'd like something that would easily create parameter classes to use but not be interchangeable with other classes of the same type. I know that I could do this with a macro but I'm leaving that for a last resort. Ryan

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boost mpi + pointer to polymorphic class
by Michael Levenhagen 08 May '09

08 May '09

Hello, I'm having a problem using boost::mpi::communicator::isend(). The problem is that it appears isend can't serialize via a pointer to the base of a polymorphic class. I'm using boost::serialization extensively to archive and I believe serializing via a pointer to a base class works when archiving. This is what I'm trying: class Event { public: virtual ~Event(); }; class Der1Event : Event { }; class Der2Event: Der1Event { }; Der2Event* d2 = new Der2Event; Der1Event* d1 = static_cast<Der1Event*>(d2) boost::mpi::communicator world; world.isend( 0, 0, d1 ); My program faults when calling isend(). I know my example is missing details such as serialization code but in principle should this work? BTW the following works. world.isend( 0, 0, d2 ) thanks Mike

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Steps to build boost library for 64 bit platform.
by Jaiswal, Usha [OS-IE] 08 May '09

08 May '09

Hi, Can any one tell me the steps to build boost library for 64 bit platform, please reply ASAP. Thanks a lot. -Usha.

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How boost::tupe avoid compilor error of get member function?
by simon Ye 08 May '09

08 May '09

Hi, all. boost::tuple provide a member template function get to gain a element of tuple, As following: #include "boost\tuple\tuple.hpp" using namespace boost; template<typename T> class TA{public: template<typename T1, typename T2> void testfun(T1 e1, T2 e2) { tuple<T1, T2> t1(e1, e2); //T1 _e1 = t1.template get<0>(); //works *T1 _e1 = t1.get<0>(); //works for boost::tuple* /* However, according c++98, t1.get<0>() seems to should be encounter a compilor error. *I want to known how boost::tuple avoid this compile error.* */ } }; int main() { int i=10; float f=10.5f; TA<char> obj; obj.testfun(i, f); return 0; } The above sample pass the compilation of gcc3.4.2 and gcc 4.2.4. *According to boost::tuple, I implement a new tuple by myself. as following: * (In fact, the following code is mostly extracted from boost::tuple. ) namespace testNS{ template<int N, class T> struct element { private: typedef typename T::tail_type Next; public: typedef typename element<N-1, Next>::type type; }; template<class T> struct element<0,T> { typedef typename T::head_type type; }; struct null_type{}; template<typename HT, typename TT> struct cons { typedef HT head_type; typedef TT tail_type; template <int N> typename element<N, cons<HT, TT> >::type *get()* { typedef typename element<N, cons<HT, TT> >::type RetType; return RetType(); } }; template<typename HT> struct cons<HT, null_type> { typedef HT head_type; typedef null_type tail_type; typedef cons<HT, null_type> self_type; //get(BOOST_EXPLICIT_TEMPLATE_NON_TYPE(int, N)) template <int N> typename element<N, self_type>::type *get()* { typedef typename element<N, cons<HT,null_type> >::type RetType; return RetType(); //return boost::tuples::get<N>(*this); } }; template <class T0, class T1, class T2> struct map_tuple_to_cons { typedef cons<T0, typename map_tuple_to_cons<T1, T2, null_type>::type > type; }; // The empty tuple is a null_type template <> struct map_tuple_to_cons<null_type, null_type, null_type> { typedef null_type type; }; template<typename T0, typename T1, typename T2=null_type> class Tuple; template<typename T0, typename T1, typename T2> class Tuple: public map_tuple_to_cons<T0, T1, T2>::type { public: typedef T0 E0T; typedef T1 E1T; typedef T2 E2T; Tuple(const E0T& e0, const E1T& e1) { } }; }//endof testNS using namespace testNS; template<typename T> class TA{public: template<typename T1, typename T2> void testfun(T1 e1, T2 e2) { Tuple<T1, T2> t1(e1, e2); //T1 _e1 = t1.template get<0>(); //works * T1 _e1 = t1.get<0>(); //encounter compilor error /* the gcc3.4.2 error message: syntax error before `;' token the gcc4.2.4 error message: error: expected primary-expression before ')' token error: invalid operands of types '<unresolved overloaded function type>' and 'int' to binary 'operator<' */* } }; int main() { int i=10; float f=10.5f; TA<char> obj; obj.testfun(i, f); return 0; } By the way, how can i get contact with boost::tuple author.? -- miss you!

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Fwd: banded symmetricmatrix
by Hicham Mouline 08 May '09

08 May '09

Sending this to boost users as well as ublas's list seems a bit dry... Rds, --------------- Hello, Is there a template to store a matrix that is both band diagonal and symmetric? Is there a compact storage for it that is even more optimal than just banded's and symmetric's ? Regards,

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[Date time] warning C4244
by Seweryn Habdank-Wojewódzki 08 May '09

08 May '09

Dears, I have a lot of warnings: boost/date_time/microsec_time_clock.hpp(103) : warning C4244: 'argument' : conversion from 'int' to 'unsigned short', possible loss of data Best regards, -- |\/\/| Seweryn Habdank-Wojewódzki \/\/ Professionalism in programming - www.accu.org ---------------------------------------------------- Zobacz extremalne skoki (base jumping) i jazdę na krechę - kliknij: http://klik.wp.pl/?adr=http%3A%2F%2Fcorto.www.wp.pl%2Fas%2Fe4.html&sid=720

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Re: [Boost-users] CMake Problems with boost 1.39
by Tan, Tom (Shanghai) 08 May '09

08 May '09

>> - The generated boost.test libs have an additional "-s" to the file >> names, ex. libboost_unit_test_framework-vc90-mt-1_39-s.lib, instead of >> libboost_unit_test_framework-vc90-mt-1_39.lib. This will cause a linking >> error while using boost.test. this does noto happen to the bjamed >> results. >> >.-s means that the library links to the static C++ runtime. The issue is, -s is appended to the end of the file name to all .lib files, even for those statically linked files that already have 's' in the middle. Ex. libboost_unit_test_framework-vc90-mt-s-1_39-s.lib, rather than libboost_unit_test_framework-vc90-mt-s-1_39.lib

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Re: [Boost-users] CMake Problems with boost 1.39
by Tan, Tom (Shanghai) 08 May '09

08 May '09

>> - The generated boost.test libs have an additional "-s" to the file >> names, ex. libboost_unit_test_framework-vc90-mt-1_39-s.lib, instead of >> libboost_unit_test_framework-vc90-mt-1_39.lib. This will cause a linking >> error while using boost.test. this does noto happen to the bjamed >> results. >> >.-s means that the library links to the static C++ runtime. The issue is, -s is appended to the end of the file name to all .lib files, even for those statically linked files that already have 's' in the middle. Ex. libboost_unit_test_framework-vc90-mt-s-1_39-s.lib, rather than libboost_unit_test_framework-vc90-mt-s-1_39.lib

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Why is _internal_weak_this public in enable_shared_from_this?
by Joseph Garvin 07 May '09

07 May '09

I can see why you might want to make it protected and have it friend the shared_ptr template (because it does the initialization of _internal_weak_this I think), but I don't see any obvious reason for it to be public. Can anyone explain? You can see the relevant code here: http://www.boost.org/doc/libs/1_38_0/boost/enable_shared_from_this.hpp

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[Boost] Boost 1.39: libdir installation path problem
by Marco Guazzone 07 May '09

07 May '09

Hi, I'm installing Boost 1.39 on Fedora 10 64bit (gcc 4.3.2) with the following command: $ ./bootstrip.sh --prefix=/home/marco/sys $ ./bjam install The installation process showed a lot of error like this: --- [error_snip] --- common.copy /lib/libboost_math_tr1f-gcc43-mt-1_39.so.1.39.0 cp: cannot create regular file `/lib/libboost_math_tr1f-gcc43-mt-1_39.so.1.39.0': Permission denied cp "bin.v2/libs/math/build/gcc-4.3.2/release/threading-multi/libboost_math_tr1f-gcc43-mt-1_39.so.1.39.0" "/lib/libboost_math_tr1f-gcc43-mt-1_39.so.1.39.0" ...failed common.copy /lib/libboost_math_tr1f-gcc43-mt-1_39.so.1.39.0... --- [/error_snip] --- In effect it seems that the script "boostrap.sh" did not correctly write the "libdir" configuration in the JAM project config file (at least as expected from what is said in the "boostraip.sh --help" message, which claims that "libdir" defaults to "EPREFIX/lib" which in turns defaults to "PREFIX/lib"). Here below is the generated "project-config.jam" file: --- [snip] --- # Boost.Build Configuration # Automatically generated by bootstrap.sh import option ; import feature ; # Compiler configuration. This definition will be used unless # you already have defined some toolsets in your user-config.jam # file. if ! gcc in [ feature.values <toolset> ] { using gcc ; } project : default-build <toolset>gcc ; # Python configuration using python : 2.5 : /usr ; # List of --with-<library> and --without-<library> # options. If left empty, all libraries will be built. # Options specified on the command line completely # override this variable. libraries = ; # These settings are equivivalent to corresponding command-line # options. option.set prefix : /home/marco/Sys ; option.set exec-prefix : /home/marco/Sys ; option.set libdir : /lib ; option.set includedir : /home/marco/Sys/include ; --- [/snip] --- To solve, I have to explicitly force the lib path with "--libdir=/home/marco/Sys/lib". Ciao, -- Marco

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BGL - graph_viz
by liquid 07 May '09

07 May '09

How to use label_writer (graph_viz) with bundled properties? Regards liquid

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[bind] performance implications?
by Dominique Devienne 07 May '09

07 May '09

Probably a silly question, but has anyone performed benchmarks on using a std::for_each(begin, end, bind(&C::f, _1)); compared to the hand written loop? Under the debugger I see bind adds a 4 or 5 stack frames between the for_each frame and the C::f frame, so I'm wondering if there is any overhead in these? I could bench it for myself on my everyday compiler for my one task, but surely this was considered and is documented somewhere, much more extensively I'll ever can, no? Some boost libraries discuss performance, but I didn't such a section in the Boost.Bind doco. Thanks for pointers or insights, --DD

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multi_array warning with vs2005
by Hicham Mouline 07 May '09

07 May '09

Hello, I get these warnings : c:\program files\boost\boost_1_39_0\boost\multi_array.hpp(477) : warning C4996: 'std::uninitialized_fill_n': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' c:\program files\boost\boost_1_38_0\boost\multi_array\extent_gen.hpp(49) : warning C4996: 'std::copy': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' 1>c:\program files\boost\boost_1_38_0\boost\multi_array\multi_array_ref.hpp(374) : warning C4996: 'std::transform': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' 1>c:\program files\boost\boost_1_38_0\boost\multi_array\multi_array_ref.hpp(380) : warning C4996: 'std::transform': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' Ditto for boost_1_38_0 Am I supposed to disable the warning explicitly in my user code? Or should the warning disable be pushed/pop in boost multi_array? Rds,

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Re: [Boost-users] multi_array warning with vs2005
by John Dlugosz 07 May '09

07 May '09

> Date: Thu, 7 May 2009 12:42:09 +0100 > From: "Hicham Mouline" <hicham(a)mouline.org> > Subject: [Boost-users] multi_array warning with vs2005 > To: <boost-users(a)lists.boost.org> > Message-ID: <002701c9cf08$dbefe5b0$93cfb110$@org> > Content-Type: text/plain; charset="us-ascii" > > Hello, > > I get these warnings : ... > Am I supposed to disable the warning explicitly in my user code? Or > should > the warning disable be pushed/pop in boost multi_array? > The warnings are warning against using features that are in fact standard, in favor of using something that may be non-standard but more robust against misuse and possibly slower. So it is appropriate to disable them on code that you are not maintaining, but are using from somewhere else. --John (sorry about the footer; it is not my idea) TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.

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boost.regex and perl expressions
by Dmitriy Lyfar 07 May '09

07 May '09

Hello, I'm trying to port my old regex code from pcre to boost.regex. There is a sample: void print_captures(const std::string& regx, const std::string& text) { boost::regex e(regx, boost::regex::perl); boost::smatch what; std::cout << "Expression: \"" << regx << "\"\n"; std::cout << "Text: \"" << text << "\"\n"; if(boost::regex_search(text, what, e, boost::match_extra)) { unsigned i, j; for(i = 0; i < what.size(); ++i) std::cout << " $" << i << " = \"" << what[i] << "\"\n"; } else { std::cout << "** No Match found **\n"; } } int main(int , char* []) { print_captures("http:\\/\\/.*\\.(.*\\.cn)", "\n\nhttp:// www.sc500.cn/hi/mom! \ \n test http:// rdfhr.zeyulariy.cn \ \n test http:// adtgr.zeytlariy.cn \n \ http://super.test.com"); return 0; } boost::regex output is: $0 = "http://www.sc500.cn/hi/mom! test http:// rdfhr.zeyulariy.cn test http:// adtgr.zeytlariy.cn" $1 = "zeytlariy.cn" Whereas where I'm using pcre I got following substrings (except full match): sc500.cn zeytlariy.cn zeyulariy.cn which is expected. So I'm confused about how perl expressions are worked. How can I get the same results using boost instead of pcre? Thank you.

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[1.38.0][Serialization] [SunOS] Build ok but crashes when runing
by Jo anneChiang 07 May '09

07 May '09

The following is my configuration: 1. uname -a : SunOs xxx 5.10 Generic_127127-11 sun4u sparc SUNW,Sun-Fire-V215 2. user-config.jam: using sun : 5.10 : my-path-to-sunwspro-CC : <stdlib>sun-stlport <cxxflags>"-library=stlport4 -xtartget=ultra2 -xarch=v9" <linkflags>"=library=stlport4 -xtarget=ultra2 -xarch=v9" 3. running : bjam --with-serialization OK and the static library can be sucessfully built. However when it linked to my program and performs serialization, a segmentation fault occurs. Actually, I also found many among the bundled unit-tests are crashed as well, so supposedly the root cause is not my program logic. (the tests result in 3 kinds of crashes: stream error, segmentation fault and Illegal Instruction) So I'd like to consult if any of you have successfully pass all the unit-tests of boost.serialization under Sun studio CC with stlport4 ? Is there any glue or exprerience that can be provided here ? Or it tends to be a bug ? Thanks much, /maverick _______________________________________ ��ӭʹ�ó��Ż�� http://cn.mail.yahoo.com

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[iostreams] why doesn't file_sink flush?
by Andrew Schweitzer 07 May '09

07 May '09

I'm trying to chain debugging logs together with a filtering_ostream. I've discovered that I need to call flush() on the filtering_ostream to get characters to appear in console in a timely fashion. This flush() call doesn't causes the file to be flushed. After some digging, I've discovered that the boost::iostreams::file_sink doesn't have the flushable_tag (or implement flush). std::fstream does have a flush function, and if I use it directly (not chained into a filtering_ostream), the flush call works as you might expect. So what is the appropriate way of implementing this? Chaining multiple logs together seems like a great way to use iostreams library. And out of curiosity, why doesn't file_sink implement flushable_tag? Here is the code I was using: #include <boost/iostreams/stream.hpp> #include <boost/iostreams/device/file.hpp> #include <boost/iostreams/stream.hpp> #include <boost/iostreams/tee.hpp> #include <boost/iostreams/filtering_stream.hpp> #include <boost/iostreams/categories.hpp> #include <boost/iostreams/concepts.hpp> #include <boost/thread.hpp> #include <boost/thread/xtime.hpp> #include <iostream> int main(int argc, char** argv) { using namespace std; using namespace boost; using namespace boost::iostreams; filtering_ostream fo; file_sink fsink("out.txt"); tee_filter<file_sink> tee_fsink(fsink); fo.push(tee_fsink); fo.push(cout); int i = 0; while(true) { fo << i << " "; //without this, I don't see "one print / second" //with it, I only see them on cout, but not in out.txt. fo.flush(); i++; boost::xtime xt; boost::xtime_get(&xt, boost::TIME_UTC); xt.sec += 1; boost::thread::sleep(xt); } return 0; } tx Andy

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Xpressive, symantic actions and combination enumeration
by Lee Simpson 07 May '09

07 May '09

Hi, First let me say. Awesome library and thanks for releasing it to the world. I'm looking for a way to apply all the currently queued semantic actions _without_ turning off backtracking. So, as the manual suggests, keep manages to apply the queued actions but it also turns off backtracking. The reason I am doing this is simple though unusual. I am trying to determine every possible match for a given input sequence, recording and ranking each one individually. A simple (contrived) example would be... input = "abcd"; expression = apply(+alpha[save_lhs(_)] >> +alpha[save_rhs(_)] >> eos) Ideally, applying the expression would yield the following combinations for 'lhs' and 'rhs' 1. "a","bcd" 2. "ab","cd" 3. "abc","d" The best solution I have come up with has an unacceptable time complexity. In short, the solution is to have a match assertion at the end of the expression which only succeeds on the nth try. I then use a while loop, executing regex_match with increasing values of 'n' until no more matches are found. Of course the problem with this solution is that the time complexity goes to n!+(n-1)!+(n-2)!... Any ideas?

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[rerepost][threads] recursive shared_mutex
by joaquin＠tid.es 06 May '09

06 May '09

I promise this is the last time I repost this; if I got no response I'll go and try somewhere else :-/ thanks for your patience. As the docs do not explicitly say otherwise, I guess I must assume that boost::shared_mutex is not recursive with respect to unique ownership, that is, the following behavior ensues: shared_mutex mutex; lock_guard<shared_mutex> lock1(mutex); lock_guard<shared_mutex> lock2(mutex); // DEADLOCK Is this so? In case boost::shared_mutex is indeed non-recursive, I've read the following assertion on Hinnant's paper N2406 (http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2406.html ): "A recursive shared mutex could be built upon shared_mutex if desired, but this is not proposed." Does anyone has a reference on how to construct a recursive shared_mutex from a non-recursive one? Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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[optional]
by dariomt＠gmail.com 06 May '09

06 May '09

Hi list, In 'classic' C++ style I have signalled optional parameters in a function with pointers that might be null (I wouldn't like to create overloads for all possible combination of existing and non-existing parameters) e.g. // p1 is mandatory, p2, p3 and p4 are optional void f(const Param1& p1, const Param2* p2, const Param3* p3, const Param4* p4); And call it Param1p1; Param2 p2; Param4 p4; f(p1, &p2, 0, &p4); I thought I could use boost::optional like this void f(const Param1& p1, const boost::optional<Param2> & p2, const boost::optional<Param3> p3, const boost::optional<Param4> & p4); And call it Param1p1; Param2 p2; Param4 p4; f(p1, boost::optional<Param2>(p2), boost::optional<Param3>(), boost::optional<Param4>(p4) ); but I haven't seen this usage in the examples in the documentation of Boost.Optional. Is this usage correct? Are there any hidden drawbacks with this approach? TIA

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[Boost]bootsrap command not working.
by Jaiswal, Usha [OS-IE] 06 May '09

06 May '09

Hi, I need to build boost libraries for 64 bit platform for this I am using "bootstrap " command at command prompt but message is coming "bootstrap is not recognized as internal or external command, operable or batch file" What is the right way to use bootstrap command or if there is any bootstrap.bat or exe file, where is it present?? Thanks in advance for your help. -Usha.

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Re: [Boost-users] Stepping into a boost::function while debugging
by Neil Hunt 06 May '09

06 May '09

> > > I just hit step into until I get to familiar code. ... > > In Christ, > Steven Watanabe > > Ha! Somehow I think, Steven, there is no code which with you are unfamiliar. And I expect that even includes code you have never seen before. Neil

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[BGL] citing the Boost Graph Library
by Alejandro Marcos Aragón 06 May '09

06 May '09

Can anyone point me how to cite the Boost Graph Library in a paper? Is there any information in the boost website? Thank you all, Alejandro Aragón

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