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RE: [Boost-Users] newbie: trouble composing with boost::bind
by Tom Matelich 30 May '03

30 May '03

http://groups.yahoo.com/group/Boost-Users/message/4086 > -----Original Message----- > From: Jacques A. Vidrine [mailto:nectar/boost@celabo.org] > Sent: Wednesday, May 28, 2003 6:19 AM > To: boost-users(a)yahoogroups.com > Subject: [Boost-Users] newbie: trouble composing with boost::bind > > > [Apologies if this is a duplicate. I posted this shortly after I > subscribed, but I didn't see it come across.] > ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

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RE: [Boost-Users] Regex: matching either of 2 fields, in any orde r
by Jim.Hyslop 30 May '03

30 May '03

John Maddock wrote: [unknown] wrote (please try to attribute quotes) > > I can see how I could do this in a loop to replace the different > > subfields. Is there another step I would need to take to > > guarantee that > > there is at most one of each type of subfield? > > Well if you search for "C(\\d+)|O(\\w+)" it can only match > one or the other > can't it? Or am I missing something? I could be wrong, but I interpreted the OP's question to mean: is it possible to have the regex generate an error if more than one sub-field of a specific type is found, i.e. the following would be invalid: ~C123~C345 The original poster can correct me if I've misinterpreted anything. -- Jim

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RE: [Boost-Users] Regex: matching either of 2 fields, in any order
by john.wismar＠alldata.com 30 May '03

30 May '03

> -----Original Message----- > From: John Maddock [mailto:john_maddock@compuserve.com] > Sent: Thursday, May 29, 2003 4:10 AM > To: Boost-Users(a)yahoogroups.com > Subject: Re: [Boost-Users] Regex: matching either of 2 > fields, in any order > > > Is it possible to do this in a single > > operation, given that the order of the fields is arbitrary? > > Yes do a conditional search and replace: > > search for "C(\\d+)|O(\\w+)" > > and replace with "(?1first-text)(?2second-text)" > > don't forget to set the flag format_all when calling > regex_merge to do this > (in future conditional replacements will only be enabled when actually > requested). Thanks for the reply! I can see how I could do this in a loop to replace the different subfields. Is there another step I would need to take to guarantee that there is at most one of each type of subfield? ------------------------------ John Wismar BSA - AllData Offline Products john.wismar(a)alldata.com

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Problems Using boost:date_time library
by Carl Waldbieser 29 May '03

29 May '03

I recently tried some simple tests of the Boost date-time library (Boost 1.30.0 MSVC6) and ran into problems. I don't have the original code in front of me (unfortunately I left it at work), but more or less, it looked like this: #include "boost/date_time/gregorian/gregorian.hpp" #include <iostream> int main() { using namespace boost::gregorian; date today = day_clock::local_day(); month_iterator it(today); std::advance(it, 3); std::string strDate(to_simple_string(*it)); std::cout << "New date is " << strDate << std::endl; return 0; } The first problem I ran into was that I got a linker error because the class greg_month (in greg_month.hpp) did not provide definitions for the following member functions: const char* as_short_string() const; const char* as_long_string() const; I quicky wrote some inline switch statements to get past that hurdle, but then the compiler started complaining when I tried to use std::advance. It is unfortunate that I do not have the exact error in front of me right now, but I did trace the problem to the definition of month_iterator. I found that if I derived its base implementation class from the class template iterator that it would compile without problems. Is this a problem with the STL that ships with MSVC6? Anyway, I was wondering if maybe there was something I had not set up correctly with my compiler that was causing me to get these errors. Any help would be appreciated. Carl Waldbieser waldbie(at-sign-goes-here)attglobal.net

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date_time generator question
by Claus Tondering 29 May '03

29 May '03

Is there any reason why date_time::partial_date<date> also exists as gregorian::partial_date, but date_time::first_kday_after<date> does not exist as gregorian::first_kday_after? (A similar question could be asked for other classes in the date_generators.hpp file.) -- Claus Tondering Danish Technological Institute

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Regex: matching either of 2 fields, in any order
by john.wismar＠alldata.com 29 May '03

29 May '03

I have a string that I'm searching, with sub-fields that are delimited by '~'. I'm particularly interested in 2 of the fields, either of which may or may not exist, in an unspecified order, and are identified by an initial 'C' and 'O' respectively. The 'C' is always followed by one or more digits, the 'O' is followed by one or more characters. For example, these are all valid. ~A123~C456~MA4 ~C12345~OA1~A123 ~A4~MH1 I'd like to see if I can use regular expressions to say, "If there is a 'C' field, replace the digits after it with these digits. If there is an 'O' field, replace the characters after it with these characters." I can do this quite easily with two different regex search-and-replaces; if the fields were always in the same order, I'd have no problem with that, either. Is it possible to do this in a single operation, given that the order of the fields is arbitrary? ------------------------------ John Wismar BSA - AllData Offline Products john.wismar(a)alldata.com

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newbie: trouble composing with boost::bind
by Jacques A. Vidrine 28 May '03

28 May '03

[Apologies if this is a duplicate. I posted this shortly after I subscribed, but I didn't see it come across.] Hello, I'm new to the Boost library and quite excited to see some of the tools available to assist writing functional-style code. Recently I wanted to perform an action on every object in a container of smart pointers (boost::shared_ptr). I couldn't seem to find a concise way to do so. Here is a small example (no container involved) demonstrating the problem I'm encountering. #include <iostream> #include <string> #include <boost/shared_ptr.hpp> #include <boost/bind.hpp> using namespace std; using namespace boost; void xprint(ostream *os, shared_ptr<string> p) { *os << p.get()->c_str() << endl; } void xprint2(ostream *os, string *p) { *os << p->c_str() << endl; } int main(int ac, char *av[]) { shared_ptr<string> p(new string("Test")); bind(xprint, &cerr, _1)(p); #ifdef THIS_DOES_NOT_WORK bind(xprint2, &cerr, _1)( bind(&shared_ptr<string>::get, _1)(p) ); #else string *q = bind(&shared_ptr<string>::get, _1)(p); bind(xprint2, &cerr, _1)(q); #endif return 0; } Using GCC 3.2, I encounter a `no match for call' error in the `THIS_DOES_NOT_WORK' section of code. (Full diagnostics below.) I have tried many variations using mem_fn, apply, and by specifying the return type of the functor explicitly, but with no success. I'm afraid I don't understand the problem. I hoped someone here might be able to hit me with a clue-stick :-) Cheers, -- Jacques Vidrine . NTT/Verio SME . FreeBSD UNIX . Heimdal nectar(a)celabo.org . jvidrine(a)verio.net . nectar(a)freebsd.org . nectar(a)kth.se g++ -DTHIS_DOES_NOT_WORK -I/usr/local/include example.cc example.cc: In function `int main(int, char**)': example.cc:31: no match for call to `(boost::_bi::bind_t<void, void (*)(std::ostream*, std::string*), boost::_bi::list2<boost::_bi::value<std::ostream*>, boost::arg<1> > >) ( std::string*)' /usr/local/include/boost/bind/bind_template.hpp:19: candidates are: boost::_bi::result_traits<R, F>::type boost::_bi::bind_t<R, F, L>::operator()() [with R = void, F = void (*)(std::ostream*, std::string*), L = boost::_bi::list2<boost::_bi::value<std::ostream*>, boost::arg<1> >] /usr/local/include/boost/bind/bind_template.hpp:25: boost::_bi::result_traits<R, F>::type boost::_bi::bind_t<R, F, L>::operator()() const [with R = void, F = void (*)(std::ostream*, std::string*), L = boost::_bi::list2<boost::_bi::value<std::ostream*>, boost::arg<1> >] /usr/local/include/boost/bind/bind_template.hpp:31: boost::_bi::result_traits<R, F>::type boost::_bi::bind_t<R, F, L>::operator()(A1&) [with A1 = std::string*, R = void, F = void (*)(std::ostream*, std::string*), L = boost::_bi::list2<boost::_bi::value<std::ostream*>, boost::arg<1> >] /usr/local/include/boost/bind/bind_template.hpp:37: boost::_bi::result_traits<R, F>::type boost::_bi::bind_t<R, F, L>::operator()(A1&) const [with A1 = std::string*, R = void, F = void (*)(std::ostream*, std::string*), L = boost::_bi::list2<boost::_bi::value<std::ostream*>, boost::arg<1> >]

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[newbie] Question on embedding/extending with boost::python
by Chris Heald 28 May '03

28 May '03

Hi all -- I'm working on an app that is going to be a C++ code engine which will be heavily extended through a series of Python scripts (objects, really). My desired requirements are as follows: The environment is a C++ state machine, and each Python object should persistantly maintain its own state. I assume I can instanciate a Python object and maintain it in C++, then call it when necessary. a) Embed the Python interpreter b) Be able to pass values from the C++ state machine into the Python object for internal use c) Be able to call arbitrary Python functions from C++. I am currently doing this with an event registration handler, where scripts will handle events they want to handle, along with the function that should be called when the event is fired. d) Be able to update the C++ state machine with an interface exposed from C++ I can do a and b easily enough - the examples make that clear. Where I'm having trouble is with c and d - how do I give a Python app hooks into an existing C++ state machine? I know I can write an extension easily enough, but by my understanding, that will simply give the Python object access to a series of functions, and not the objects contained in the state machine that the interpreter is running under. I could use "pull" operations, wherein the C++ app polls the objects for changed state in a loop and updates its sate accordingly, but that seems that it wouldn't perform nearly so well as if the Python scripts were able to update the C++ state machine themselves, so I'm avoiding that route. I had a co-worker suggest that I use Python as my primary execution environment instead of C++. While this would admittedly make some things easier, how much performance would I sacrifice with this route? I'm building a 3D application, and it doesn't seem that Python would be well-suited to such an application in terms of performance. There is potential for literally tens of thousands of instances of these objects to exist in this state machine, and I certainly don't want to hinder performance by moving the primary execution into an interpreted environment rather than a compiled environment. Any words of wisdom? Or am I utterly failing to communicate clearly, as I think I am? ;) Thanks, Chris

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Newbie: can't build Boot.Python with Borland bcc32 5.5.1
by David Webster-Jaggard 27 May '03

27 May '03

Hello. Sorry if the answer to this question is available elsewhere but I haven't found it yet. I would like to build the python library in boost_1_30_0 using Borland C++ Builder 5 (bcc32 version 5.5.1). Currently, this fails with a number of errors, the first and most significant being: Error E2401 C:\boost\boost_1_30_0\boost/python/object/inheritance.hpp 69: Invalid template argument list The statement around line 69 from inheritance.hpp is as follows: typedef typename mpl::if_c< is_polymorphic<T>::value , polymorphic_id_generator<T> , non_polymorphic_id_generator<T> >::type type; Is the borland compiler simply incapable of compiling this statement or (as is likely) have I missed something? Thanks in advance

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RE: [Boost-Users] Re: boost::date_time::posix_time and Intel Comp iler 7.0?
by Tom Matelich 27 May '03

27 May '03

I regularly use Qt, Intel, STLPort, etc. So feel free to email me privately on that subject. Tom > -----Original Message----- > From: adutoit [mailto:adutoit@stonethree.com] > Sent: Monday, May 26, 2003 12:31 AM > To: Boost-Users(a)yahoogroups.com > Subject: Re: [Boost-Users] Re: boost::date_time::posix_time and Intel > Compiler 7.0? > > > I think I finally sorted out my previous compile errors when > I changed the > order in which my include directories are searched. But now > I get errors > relating to STLPort and Qt... So I'll probably continue this > saga on the > STLPort > mailing list! > > Thanks anyway. > > A. > ----- Original Message ----- > From: "Markus Werle" <yg-boost-users(a)gmane.org> > To: <boost-users(a)yahoogroups.com> > Sent: Thursday, May 22, 2003 8:59 PM > Subject: [Boost-Users] Re: boost::date_time::posix_time and > Intel Compiler > 7.0? > > > > adutoit wrote: > > > > > [ a lot of trouble using boost and Intel C++ ] > > > > Since I had no time to "configure" Intel's compiler > > and since I was so fed up with getting it up and running, > > I did 2 things with Intel-7.0 on linux which work for me: > > > > I use -ansi and -DBOOST_NO_CONFIG. > > Though the latter might be a bad idea in general > > (since no special platform-dependent optimization > > can be used then) this solved a lot of trouble, > > especially since some parts of boost make (made?) assumptions > > about Intel's behaviour that no longer hold. > > > > >From my own experience, if it compiles with gcc-3.2 -ansi > > it should never fail with Intel's compiler except when the code > > is not completely compliant. At present I use gcc only for the > > much more intelligent error messages for templates. > > > > If You could provide a small code snippet which > > shows this error I can try to compile it under Linux > > and see what is happening there. > > > > > > Markus > > > > > > > > -- > > > > Compile time analytic differentiation? > > Yes, at http://daixtrose.sourceforge.net/ > > > > > > > > Info: <http://www.boost.org> > > Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> > Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> > > > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ > Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------

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