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Newbee Questions on Directory Structure of Boost Libs.
by Adalbert Perbandt 01 Jun '03

01 Jun '03

Hi there, I'm new to Boost and have some problems understanding the way Boost libs. are built and installed. I downloaded boost_1_30_0. unpacked the archive and built the test library (I had installed bjam previously). I did the build step on two different platforms and with different compilers: - On Linux (RedHat 7.3) with gcc/3.2.2 and - on Sun SPARC Solaris 2.7 with Sun's Forte 6.2 compiler. I created an installation directory /opt/boost_1.30.0. Into this directory I copied the directory tree below boost/test and libs/test: /opt/boost_1.30.0/boost/test/... /opt/boost_1.30.0/libs/test/... I think so far everything is correct, isn't it? I do not completely understand the directory structure generated during the build process: ../boost_1_30_0/libs/test/build/bin/libboost_prg_exec_monitor.a /libboost_prg_exec_monitor.so /libboost_test_exec_monitor.a /libboost_test_exec_monitor.so /libboost_unit_test_framework.a /libboost_unit_test_framework.so Below the directories given above a specific subdirectory tree was created. Example: .../libboost_prg_exec_monitor.a/ /sunpro/ /debug/ /runtime-link-dynamic/ /runtime-link-static/ /threading-multi/libboost_prg_exec_monitor.a /threading-single/libboost_prg_exec_monitor.a >From this I conclude: 1. The builds are separated from each other in compiler specific subdirectory trees, e.g. the "sunpro" subtree contains the build results from $ bjam "-sTOOLS=sunpro" i.e. the sun forte 6.2 compiler and the "gcc" subtree contains the build results from $ bjam "-sTOOLS=gcc" i.e. the gcc 3.2.2 compiler on Linux. Obviously there is no separation by OS platform (Solaris or Linux). What would I have to do to build the lib. with gcc on Solaris? Where would the products be installed? Furthermore there is no separation by compiler version (e.g. gcc 2.95.2 is not separated from gcc 3.2.2). Is this considered unnecessary? 2. The libs were built with debug symbols (-g option) only), correct? I'm not familiar with jam and therefore don't know what to do to get them built with optimization active. It seems to me as if this should be rather simple because in ../boost_1_30_0/tools/build/sunpro-tools.jam obviously two variants of the CFLAGS variable for optimization are defined: flags sunpro CFLAGS <optimization>speed : -fast -O4 ; flags sunpro CFLAGS <optimization>space : -O2 -xspace ; Any hints are welcome. Thanks, Adalbert Perbandt.

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RE: [Boost-Users] Regex: matching either of 2 fields, in any order
by john.wismar＠alldata.com 31 May '03

31 May '03

That's it exactly. And your explanation was a lot more succinct than mine, too! Thanks. ------------------------------ John Wismar BSA - AllData Offline Products john.wismar(a)alldata.com > -----Original Message----- > From: Jim.Hyslop [mailto:jim.hyslop@leitch.com] > Sent: Friday, May 30, 2003 6:10 AM > To: 'Boost-Users(a)yahoogroups.com' > Subject: RE: [Boost-Users] Regex: matching either of 2 > fields, in any orde r > > > 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 > > ------------------------ Yahoo! Groups Sponsor > ---------------------~--> > Get A Free Psychic Reading! Your Online Answer To Life's > Important Questions. > http://us.click.yahoo.com/Lj3uPC/Me7FAA/ySSFAA/EbFolB/TM > -------------------------------------------------------------- > -------~-> > > 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/ > > >

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Using Bind with Signals (version 2)
by Darren Vincent Hart 30 May '03

30 May '03

Similar to my last post, this is a slightly different implementation where the handler has a signal of its own. Now I can't seem to bind to the handler functor, getting a compiler message like: /usr/include/boost/bind.hpp:60: error: `bool (handler::*)(char)' is not a class, struct, or union type The goal is that when the keypress signal is emitted, it will execute the handler which will receive the char (key), test it, and emit its signal (sig) if appropriate. Any help would again be much appreciated, the short code follow, with the problematic bind statement commented: Thanks in advance, Darren Hart compile: g++ test.cpp -o test -lboost_signals // test.cpp ---------------------------------------------------- #include <iostream> #include <boost/signal.hpp> #include <boost/function.hpp> #include <boost/bind.hpp> #include <boost/bind/apply.hpp> using namespace std; struct widget { boost::signal<bool ()> sig; boost::signal<bool (char)> keypress; bool test() { cout << "widget::test() - sig empty: " << (sig.empty() ? "true" : "false") << endl; sig(); return true; } }; struct handler { char key_; boost::signal<bool ()> sig; handler(char key) : key_(key) { } bool operator()(char key) { cout << "handler::operator() - received a " << key << endl; if (!sig.empty() && key == key_) { cout << "\texecuting slot\n\t"; sig(); } cout << endl; return true; } }; struct no_op { bool operator()() { cout << "no_op::operator() - doing nothing" << endl; return true; } bool test() { cout << "no_op::test()" << endl; return true; } }; int main() { // instantiate two widgets widget widget_a; widget widget_b; // instanstiate the functions object (and test them) no_op no_op_; handler handler_a('A'); handler_a.sig.connect(no_op_); no_op_(); handler_a('A'); // connect the function objects to the widgets widget_a.sig.connect(no_op_); // THE PROBLEM IS HERE - HOW DO I BIND TO handler_a.test(char) ? widget_b.keypress.connect( boost::bind(&handler::operator(), &handler_a) ); // END PROBLEM cout << "signalling widget_b.keypress('B')" << endl; widget_b.keypress('B'); // call the handler 3 times, but never execute its slot cout << "\nsignalling widget_b.keypress('A')" << endl; widget_b.keypress('A'); // call the handler 3 times, executing the slot return 0; }

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Re: Using Bind on Signals
by Peter Dimov 30 May '03

30 May '03

darrenvhart wrote: > --- In Boost-Users(a)yahoogroups.com, "Peter Dimov" <pdimov@m...> wrote: >> >> You can use apply<> from <boost/bind/apply.hpp> instead of 'call': >> >> bind(apply<bool>(), bind(&widget::sig, &widget_a)) (); // should call >> widget_a->sig > > Thank you for the reply. > > I have changed the line to use apply<bool>() and included the header > file, but it won't compile complaining about noncopyable members of > the signal of the widget. Any ideas what that is all about ? Please change every 'F f' to 'F & f' in boost/bind/apply.hpp; this will take care of the problem. I've already updated the CVS version. The problem is that a signal is noncopyable and cannot be passed by value.

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Using Bind on Signals
by Darren Vincent Hart 30 May '03

30 May '03

I am building a widget set using the signals and slots library. I have the need to be able create a functor (FA) that receives another (FB) as an argument to its constructor. I will connect FA to the signal of a widget, when FA is run it will perform a test and execute FB if appropriate. I want to be able to use the signal member of another widget as FB, so I am trying to use bind to get that function object for the signal. I am experiencing two problems: 1) When the member functor (FB) is bound to the signal of another widget, the slots don't get called. (No error results, but the connected slot doesn't print anything so I am assuming it isn't being executed). 2) I can't get it to compile when the signal has a <bool ()> signature, I can only get it to compile with a <void ()> signature. I am trying to assign the result of bind to a boost::function<bool ()> but I get an error saying it can't make the conversion, what type should I be using if not boost::function (note that it works if the signal is void())? The following is a commented test_case demonstrating the problem. Any assistance in binding to signals and compiling those with a bool() signature would be greatly appreciated. Thanks in advance, Darren Hart compile with: g++ test.cpp -o test -lboost_signals // test.cpp ---------------------------------------------------------- #include <iostream> #include <boost/signal.hpp> #include <boost/function.hpp> #include <boost/bind.hpp> using namespace std; struct widget { boost::signal<bool ()> sig; boost::signal<bool (char)> keypress; bool test() { cout << "widget::test() - sig empty: " << (sig.empty() ? "true" : "false") << endl; sig(); return true; } }; template <typename T> struct handler { boost::function<T ()> slot_; handler(boost::function<T ()> slot) : slot_(slot) { } bool operator()(char letter) { cout << "handler::operator() - received a " << letter << endl; if (letter == 'A') { cout << "\texecuting slot\n\t"; slot_(); cout << endl; } return true; } }; struct no_op { bool operator()() { cout << "no_op::operator() - doing nothing" << endl; return true; } bool test() { cout << "no_op::test()" << endl; return true; } }; int main() { // instantiate two widgets widget widget_a; widget widget_b; /* The goal is to connect the hanlder to widget_b which will then call * widget_a's sig signal. The problem is that even though widget_a's * test says that sig() isn't empty, it doesn't execute when bound * directly in handler_b. It does however work when called as part * of the test() member function as in handler_c. We must get * handler_b to work in order to do this in libstk! We can't compile * at all if the signal returns a bool. */ // instanstiate the function objects no_op no_op_; // bind to a no_op member, successul handler<bool> handler_a( boost::bind(&no_op::test, &no_op_) ); // bind to a widget signal handler, BROKEN //handler<bool> handler_b( boost::bind<bool>(&widget::sig, &widget_a) ); // <-- Broken // bind to a widget member, successul handler<bool> handler_c( boost::bind(&widget::test, &widget_a) ); // connect the function objects to the widgets widget_a.sig.connect(no_op_); widget_b.keypress.connect(0, handler_a); //widget_b.keypress.connect(1, handler_b); // fix handler_b above, then uncomment this widget_b.keypress.connect(2, handler_c); cout << "attempting to bind to widget_a's sig signal" << endl; // store the function object returned by binding a widget signal, BROKEN //boost::function<bool ()> fp = boost::bind(&widget::sig, &widget_a); // <-- BROKEN // executre the functor returned by binding a widget signal, BROKEN // (builds, but doesn't really call widget_a.sig()) boost::bind(&widget::sig, &widget_a)(); // <-- Test if binding works at all, it doesn't // signal the keypress signals, they will test the character and execute their // slots if it equals 'A' cout << "signalling widget_b.keypress('B')" << endl; widget_b.keypress('B'); // call the handler 3 times, but never execute its slot cout << "***\nThis correctly executed the three handlers which, also correctly," << " do not execute their slots\n***" << endl; cout << "signalling widget_b.keypress('A')" << endl; widget_b.keypress('A'); // call the handler 3 times, executing the slot cout << "***\nThis executes the three handlers, but handler_b calls slot_() " << "and widget_a's signal does not execute the slot it has, which the " << "test() in handler_c successfully executes.\n***" << endl; return 0; } // --------------------------------------------------------------------

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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

The detail I'm concerned about -- and it may not be a problem because I may be overlooking something -- is that the string I'm matching against can have zero or one 'C' field and zero or one 'O' fields. It looks like the "C(\\d+)|O(\\w+)" expression will match either of them if at least one is present, but after that, I would need optionally to match the other one. Matching the same field again would be an error. In other words: ~C12345~OF <-- valid (1 of each) ~OF <-- valid (1 'O' field) ~C12345 <-- valid (1 'C' field) ~ZAQ~C12345 <-- valid (1 'C' field) ~OV~C67890 <-- valid (1 of each) ~A23~OV~DFG~C67890~ZAQ <-- valid (1 of each) ~A23~DFG <-- valid (neither) ~C12345~OF~C67890 <-- invalid (2 'C' fields) ~C12345~OF~OV <-- invalid (2 'O' fields) ~ASD~C12345~OF~OV <-- invalid (2 'O' fields) Thanks again for your help!! ------------------------------ John Wismar BSA - AllData Offline Products john.wismar(a)alldata.com > -----Original Message----- > From: John Maddock [mailto:john_maddock@compuserve.com] > Sent: Friday, May 30, 2003 3:43 AM > To: Boost-Users(a)yahoogroups.com > Subject: Re: [Boost-Users] Regex: matching either of 2 > fields, in any order > > > > 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? > > John.

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int64_t problem
by Sigis 30 May '03

30 May '03

Hi, I am using OpenInventor and boost 1.29 librariess. Both of them have defined int64_t: typedef __int64 int64_t; During compiling I get some errors: d:\work\projects\medint\dist\include\boost\cstdint.hpp(240) : error C2632: '__int64' followed by '__int64' is illegal d:\work\projects\medint\dist\include\boost\cstdint.hpp(240) : warning C4091: 'typedef ' : ignored on left of '__int64' when no variable is declared d:\work\projects\medint\dist\include\inttypes.h(75) : error C2632: '__int64' followed by '__int64' is illegal d:\work\projects\medint\dist\include\inttypes.h(75) : warning C4091: 'typedef ' : ignored on left of '__int64' when no variable is declared The only solution I found is to add #undef just before define at boost/cstdint.hpp: #undef int64_t typedef __int64 int64_t; But it looks as dirty solution. Maybe it is possilbe to solve this problme in more elegant way? P.S. adding #undef int64_t to boost/config/user.hpp only reduces the count of errors from 10 to 6. -- Sigis

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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 27 May '03

27 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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[uBLAS] Expert Developer Advice Needed ... Maybe...
by dmatt001 27 May '03

27 May '03

Hi Guys, After a significantly long break from using uBLAS, I have now been lucky enough to find myself in a new role where I can again use it! Having noted that there was no vector cross product in uBLAS, I thought I would implement my own. To make it really efficient and work in with the other uBLAS features, I thought I would try to make a compatible routine that eliminates temporaries and uses the other cool uBLAS features. So far so good. To start, I decided to use a simple case that I could easily check: a 3d vector. I also decided to copy some other routines as required to get going. For this reason I copied "scalar_plus". Now that I have written the short piece code, it doesn't quite get there. So far not so good. ;-) I am hoping that a reader please review the short code and output below and give some quick pointers about what I can do better...? Perhaps I need to get some better knowledge about the relevant tricks -- I was hoping to emulate another developer in the first instance. Thanks, Matt --- Code Follows --- namespace boost { namespace numeric { namespace ublas { // Binary returning vector template<class T1, class T2> struct vector_vector_binary_functor { typedef std::size_t size_type; typedef std::ptrdiff_t difference_type; typedef typename promote_traits<T1, T2>::promote_type promote_type; typedef promote_type value_type; typedef vector<promote_type> result_type; }; template<class T1, class T2> struct vector_vector_prod: public vector_vector_binary_functor<T1, T2> { typedef typename vector_vector_binary_functor<T1, T2>::size_type size_type; typedef typename vector_vector_binary_functor<T1, T2>::difference_type difference_type; typedef typename vector_vector_binary_functor<T1, T2>::value_type value_type; typedef typename vector_vector_binary_functor<T1, T2>::result_type result_type; template<class E1, class E2> BOOST_UBLAS_INLINE result_type operator () (const vector_expression<E1> &e1, const vector_expression<E2> &e2) const { // why use t() and e1() ? result_type t(3); t () (0) = e1 () (1) * e2 () (2) - e2 () (1) * e1 () (2); t () (1) = - e1 () (0) * e2 () (2) + e2 () (0) * e1 () (2); t () (2) = e1 () (0) * e2 () (1) - e2 () (0) * e1 () (1); return t; } }; template<class E1, class E2> BOOST_UBLAS_INLINE typename vector_binary_traits<E1, E2, vector_vector_prod<typename E1::value_type, typename E2::value_type> >::result_type vect_prod(const vector_expression<E1> &e1, const vector_expression<E2> &e2) { typedef typename vector_binary_traits<E1, E2, vector_vector_prod<typename E1::value_type, typename E2::value_type> >::expression_type expression_type; return expression_type(e1 (), e2 ()); } } } } --- Error Follows --- /home/matt/code/c++/pkg/boost_1_30_0/boost/numeric/ublas/functional.hpp: In member function `void boost::numeric::ublas::scalar_assign<T1, T2>::operator()(boost::numeric::ublas::scalar_binary_assign_functor<T1, T2>::argument1_type, boost::numeric::ublas::scalar_binary_assign_functor<T1, T2>::argument2_type) const [with T1 = double, T2 = boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> >]': /home/matt/code/c++/pkg/boost_1_30_0/boost/numeric/ublas/vector_assign.hpp:252: instantiated from `void boost::numeric::ublas::indexing_vector_assign(const F&, V&, const boost::numeric::ublas::vector_expression<E>&) [with F = boost::numeric::ublas::scalar_assign<double, boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > >, V = boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, E = boost::numeric::ublas::vector<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> >, boost::numeric::ublas::unbounded_array<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > > >]' /home/matt/code/c++/pkg/boost_1_30_0/boost/numeric/ublas/vector_assign.hpp:266: instantiated from `void boost::numeric::ublas::vector_assign(const F&, V&, const boost::numeric::ublas::vector_expression<E>&, boost::numeric::ublas::dense_proxy_tag) [with F = boost::numeric::ublas::scalar_assign<double, boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > >, V = boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, E = boost::numeric::ublas::vector<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> >, boost::numeric::ublas::unbounded_array<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > > >]' /home/matt/code/c++/pkg/boost_1_30_0/boost/numeric/ublas/vector_assign.hpp:423: instantiated from `void boost::numeric::ublas::vector_assign(const F&, V&, const boost::numeric::ublas::vector_expression<E>&) [with F = boost::numeric::ublas::scalar_assign<double, boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > >, V = boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, E = boost::numeric::ublas::vector<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> >, boost::numeric::ublas::unbounded_array<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > > >]' /home/matt/code/c++/pkg/boost_1_30_0/boost/numeric/ublas/vector.hpp:77: instantiated from `boost::numeric::ublas::vector<T, A>::vector(const boost::numeric::ublas::vector_expression<E>&) [with AE = boost::numeric::ublas::vector<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> >, boost::numeric::ublas::unbounded_array<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > > >, T = double, A = boost::numeric::ublas::bounded_array<double, 3>]' src/GLWireVisitor/GLWireVisitor.cpp:121: instantiated from here /home/matt/code/c++/pkg/boost_1_30_0/boost/numeric/ublas/functional.hpp:182: cannot convert `const boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> >' to `double' in assignment /home/matt/code/c++/pkg/boost_1_30_0/boost/numeric/ublas/vector_expression.hpp: In member function `F::result_type boost::numeric::ublas::vector_binary<E1, E2, F>::operator()(boost::numeric::ublas::promote_traits<E1::size_type, E2::size_type>::promote_type) const [with E1 = boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, E2 = boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, F = boost::numeric::ublas::vector_vector_prod<double, double>]': /home/matt/code/c++/pkg/boost_1_30_0/boost/numeric/ublas/vector_assign.hpp:252: instantiated from `void boost::numeric::ublas::indexing_vector_assign(const F&, V&, const boost::numeric::ublas::vector_expression<E>&) [with F = boost::numeric::ublas::scalar_assign<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> >, boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > >, V = boost::numeric::ublas::vector<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> >, boost::numeric::ublas::unbounded_array<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > > >, E = boost::numeric::ublas::vector_binary<boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, boost::numeric::ublas::vector_vector_prod<double, double> >]' /home/matt/code/c++/pkg/boost_1_30_0/boost/numeric/ublas/vector_assign.hpp:266: instantiated from `void boost::numeric::ublas::vector_assign(const F&, V&, const boost::numeric::ublas::vector_expression<E>&, boost::numeric::ublas::dense_proxy_tag) [with F = boost::numeric::ublas::scalar_assign<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> >, boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > >, V = boost::numeric::ublas::vector<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> >, boost::numeric::ublas::unbounded_array<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > > >, E = boost::numeric::ublas::vector_binary<boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, boost::numeric::ublas::vector_vector_prod<double, double> >]' /home/matt/code/c++/pkg/boost_1_30_0/boost/numeric/ublas/vector_assign.hpp:423: instantiated from `void boost::numeric::ublas::vector_assign(const F&, V&, const boost::numeric::ublas::vector_expression<E>&) [with F = boost::numeric::ublas::scalar_assign<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> >, boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > >, V = boost::numeric::ublas::vector<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> >, boost::numeric::ublas::unbounded_array<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > > >, E = boost::numeric::ublas::vector_binary<boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, boost::numeric::ublas::vector_vector_prod<double, double> >]' /home/matt/code/c++/pkg/boost_1_30_0/boost/numeric/ublas/vector.hpp:77: instantiated from `boost::numeric::ublas::vector<T, A>::vector(const boost::numeric::ublas::vector_expression<E>&) [with AE = boost::numeric::ublas::vector_binary<boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, boost::numeric::ublas::vector_vector_prod<double, double> >, T = boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> >, A = boost::numeric::ublas::unbounded_array<boost::numeric::ublas::vector<double, boost::numeric::ublas::unbounded_array<double> > >]' src/GLWireVisitor/GLWireVisitor.cpp:70: instantiated from `boost::numeric::ublas::vector_binary_traits<E1, E2, boost::numeric::ublas::vector_vector_prod<E1::value_type, E2::value_type> >::result_type boost::numeric::ublas::vect_prod(const boost::numeric::ublas::vector_expression<E>&, const boost::numeric::ublas::vector_expression<E2>&) [with E1 = boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >, E2 = boost::numeric::ublas::vector<double, boost::numeric::ublas::bounded_array<double, 3> >]' src/GLWireVisitor/GLWireVisitor.cpp:121: instantiated from here /home/matt/code/c++/pkg/boost_1_30_0/boost/numeric/ublas/vector_expression.hpp:775: no match for call to `(boost::numeric::ublas::vector_vector_prod<double, double>) (double, double)' make: *** [obj/GLWireVisitor/GLWireVisitor.o] Error 1

1 1

Nesting Grammars with boost::spirit
by Dan Nuffer 27 May '03

27 May '03

I have two grammars defined (value and variable). I'll paste value here, variable is very similar: struct value : public grammar<value> { template <typename ScannerT> struct definition { definition(value const &self) { val = real_p[&do_real] | ('-' >> val)[&do_neg] | '+' >> val; } rule<ScannerT> val; rule<ScannerT> const &start() const { return val; } }; }; Now I want to define a grammar that uses both of these, for instance part of it might be (value | variable)... how can I do this? Thanks. _____________________________________________________________ <a href="http://www.gamedev.net">GameDev.net Email Service</a> - "Plenty of 1's and 0's" _____________________________________________________________ Select your own custom email address for FREE! Get you(a)yourchoice.com w/No Ads, 6MB, POP & more! http://www.everyone.net/selectmail?campaign=tag

1 0

boost::date_time::posix_time and Intel Compiler 7.0?
by Andre du Toit 26 May '03

26 May '03

Hi there. I get the following error when I try to compile code using boost::date_time::posix_time: c:\PROGRAM FILES\BOOST_1_30_0\boost/date_time/posix_time/time_formatters.hpp(43): error: more than one operator "<<" matches these operands: function "std::basic_ostream<_E, _Tr>::operator<<(std::_Bool={bool={bool}}) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(short) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(unsigned short) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(int) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(unsigned int) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(long) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(unsigned long) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(float) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(double) [with _E=char, _Tr=std::char_traits<char>]" function "std::basic_ostream<_E, _Tr>::operator<<(long double) [with _E=char, _Tr=std::char_traits<char>]" operand types are: std::basic_ostream<char, std::char_traits<char>> << boost::posix_time::time_duration::fractional_seconds_type << frac_sec; Looking at the offending file (time_formatters.hpp, line 43 and vicinity) gives: #if (defined(BOOST_MSVC) && (_MSC_VER <= 1200)) // 1200 == VC++ 6.0 boost::int64_t frac_sec = td.fractional_seconds(); // JDG [7/6/02 VC++ compatibility] char buff[32]; _i64toa(frac_sec, buff, 10); #else time_duration::fractional_seconds_type frac_sec = td.fractional_seconds(); #endif if (frac_sec != 0) { ss << "." << std::setw(time_duration::num_fractional_digits()) << std::setfill('0') // JDG [7/6/02 VC++ compatibility] #if (defined(BOOST_MSVC) && (_MSC_VER <= 1200)) // 1200 == VC++ 6.0 << buff; #else << frac_sec; //!!! Line 43 !!!// #endif It appears that there is not a streaming operator defined for the time_duration::fractional_seconds_type type. Looking deeper into this issue was a bit of nightmare; since the offending type consists of numerous nested typdefs etc. etc. If anyone has a short and sweet answer to my essay of a question, I would appreciate it. The obvious answer of "don't use the Intel compiler" will not suffice! Saying that, when I switched from the Intel compiler to bad old MSVC6 I had not problems. But our company's software requires the performance gain provided by the Intel compiler on Windows. Another issue, I saw that during installation of Boost, it is possible using STLPort and MSVC6 together, but (for the reasons mentioned above), why not STLPort with the Intel compiler? I did ask the same question some time before now, but no-one bothered to answer. I would really appreciate any help in this regard! Greetings, Andre.

5 10

ublas test with cwpro8
by Benedikt Weber 24 May '03

24 May '03

Hi I tried to run the tests for ublas with cwpro8 on Window 2000: D:\boost\boost_1_30_0\libs\numeric\ublas\test2>bjam -sTOOLS=cwpro8 The compiler (Codewarrior) has problems with the boost include files. Includes like #include <boost/numeric/ublas/io.hpp> work only with the system path and not with the user path. When I change <include>$(BOOST_ROOT) in the jamfile to <sysinclude>$(BOOST_ROOT) the problem disappears (but would possibly not work for other compilers). Benedikt

3 4

Boost::signal compil error under Visual studio 6
by georges_torres2003 24 May '03

24 May '03

Hello, I've got a problem using the signal library, receiving this compiler error: F:\LIBSPC\BOOST\boost/iterator_adaptors.hpp(872) : fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'msc1.cpp', line 1794) Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information F:\LIBSPC\BOOST\boost/signals/signal_template.hpp(303) : see reference to class template instantiation 'boost::iterator_adaptor<struct _STL::_Rb_tree_iterator<struct _STL::pair<class boost::any const ,struct boost::signals::detail::conn ection_slot_pair>,struct _STL::_Nonconst_traits<struct _STL::pair<class boost::any const ,struct boost::signals::detail::connection_slot_pair> > >,class boost::signals::detail::slot_call_policies<struct boost::signals::detail::call_bound2<bool>::cal ler<int,int,class boost::function2<bool,int,int,int> >,struct _STL::_Rb_tree_iterator<struct _STL::pair<class boost::any const ,struct boost::signals::detail::connection_slot_pair>,struct _STL::_Nonconst_traits<struct _STL::pair<class boost::any con st ,struct boost::signals::detail::connection_slot_pair> > > >,bool,bool &,bool *,struct _STL::input_iterator_tag,struct boost::detail::default_argument>' being compiled I'm just sending a signal at this line, as follow: // i_x and i_y are ints MouseSignalLClick(i_x, i_y); MouseSignalLClick is member of a class, defined as follow: boost::signal2<bool,int,int> MouseSignalLClick; I'm using Boost library version 1.30, and visual sp5. Thanks.

1 0

Policy based threading question
by Aschwin Gopalan 24 May '03

24 May '03

Dear Boosters! I am designing a class template with policy controled threading behaviour, like template<ThreadingModel=SingleThreaded> class Something; where there are different ThreadingModels available (see Modern C++ Design by Alexandrescu for a discussion of policies). I would like to have Something to inherit ThreadingModel. The idea is that SingleThreaded does not impose any additional penalties. So my Idea was to have something like class SingleThreaded { public: void lock() {} void release() {} } class MultiThreaded { public: void lock() { lock_mutex(m_mutex) } void release() { release_mutex(m_mutex) } private: mutex m_mutex; } and have all functions call lock() and release() accordingly. But this is not good, since it does not use Resource Initialization is Aquisition and leads to exeption safety problems and so on. Furthermore, it is not (because of these reasons) possible to model using boost::mutex ´es since they do not expose a lock() release() interface but can only be locked using scoped_locks. So another idea is to have something like class SingleThreaded { class scoped_lock { // Empty class } } class MultiThreaded { public: class scoped_lock { scoped_lock() // constructor that locks m_mutex of // of MultiThreaded ~scoped_lock() // unlocks } private: boost::mutex m_mutex; } and have the member functions lock the mutex by instantiating an embeded scoped_lock object. Now there are some questions I have: 1.) Does this approach sound sensible, or am I overlooking a commonly used Idiom to achieve this functionality 2.) How can I access the m_mutex member of the right object in scoped_lock()? The only way I can imagin is to give the this pointer to the constructor (like scoped_lock lock(this);). It is somehow not nice, but possible 3.) The actual code I am using looks like //! Policy class. /*! Multithreading, object operations are synchronized via * a non-recursive lock, obeying strict Resource Acuisition is Initialization * semantics */ class LockDefault { public: LockDefault() : m_pmutex(new boost::mutex) { } class scoped_lock : public boost::mutex::scoped_lock { public: scoped_lock(LockDefault &obj) : boost::mutex::scoped_lock(obj->m_pmutex) { } ~scoped_lock() { } }; public: boost::mutex m_mutex; }; This works with gcc and I think it does what it should. It fails to compile with VC++6 giving error C2512: 'scoped_lock<class boost::recursive_mutex>' : no appropriate default constructor which I do not understand, since the default constructor is never called. Also, I do not like to have the mutex member public, but if I make it private and write friend class scoped_lock; this does not have the desired effect (MSVC still complains about private data member access) Somehow, I must be getting something completely wrong, so if somebody could point me in the right direction, I would be thankful. BTW: I am using boost_1_30_0 Thanks, Aki

2 3

newbie: trouble composing with boost::bind
by Jacques A. Vidrine 23 May '03

23 May '03

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> >]

2 1

any_cast<double>(any_assigned_with_int) fails. workaround?
by Markus Werle 23 May '03

23 May '03

Hi! At present I learn what it means not to have strong typing: I play around with boost::any. A new and healing experience. Thank You, Bjarne, for insisting on strong typing for C++ ;-) Never made so much use of the debugger ... So now I found out that any_cast does not promote types that may be promoted like for int->double conversions. Any workaround in the lib I overlooked or is this the time for my_any_cast<T>(boost::any const &)? Markus -- Compile time analytic differentiation? Yes, at http://daixtrose.sourceforge.net/

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