- Boost-users - lists.boost.org

Re: [Boost-users] Stepping into a boost::function while debugging
by Peter Åberg 12 May '09

12 May '09

Ok, works alright I guess :-) /PÅ > Peter ?berg wrote: > > > Does anyone have a tip, suggestions or workaround on how one should do > > to step into the target function of a boost::function while debugging > > in VS 2008 (VC9), without wading through the boost::function > > implementation? > > > > I have looked around a bit now and have not found any solution except > > putting a breakpiont in the target function which may not be practical > > when one does not know which function it is. > > > > I get the feeling one have to wait for MS to add a feature like "step > > through code I don't want to see". But until then, what do you folks do? > > > > Designing with delegates in C++ feels a bit like a show-stopper for me > > until I can step into a delegate target function without getting lost > > in a haystack. > > Steven Watanabe wrote: > > I just hit step into until I get to familiar code. There isn't actually > a lot of code > to step through when calling a Boost.Function. > > In Christ, > Steven Watanabe

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Next layer: Boost.Asio mixins?
by Boris Schaeling 11 May '09

11 May '09

Did anyone create and use Boost.Asio mixins and can share his experience? I especially wonder if there is a benefit or if it's just an exercise in templates. The reason I started to think about Boost.Asio mixins is that I see the very same code in various classes which all use Boost.Asio objects. I would assume that this is not only true in my projects but also in others. Here's an example. Let's say we create a client class to connect to another host. We could come up with something like this: class client { public: void resolve(std::string host, std::string service); void connect(boost::asio::ip::tcp::resolver::iterator endpoint_iterator); void send(std::string msg); void receive(); private: boost::asio::ip::tcp::resolver r; boost::asio::ip::tcp::socket s; }; If we create another class to encapsulate a POSIX file descriptor we don't need resolve() and connect() but send() and receive(): class posix_fd { public: void send(std::string msg); void receive(); private: boost::asio::posix::stream_descriptor fd; }; While the two classes are based on different I/O objects the implementation of send() and receive() could be the same. That lead me to create mixins with which I can define client and posix_fd like this: class client : public resolver<boost::asio::ip::tcp::resolver, handler>, public connector<boost::asio::ip::tcp::socket, handler>, public sender<boost::asio::ip::tcp::socket, handler>, public receiver<boost::asio::ip::tcp::socket, handler> { // Inherited from parent classes: // void resolve(std::string host, std::string service); // void connect(boost::asio::ip::tcp::resolver::iterator endpoint_iterator); // void send(std::string msg); // void receive(); }; class posix_fd : public sender<boost::asio::posix::stream_descriptor, handler>, public receiver<boost::asio::posix::stream_descriptor, handler> { // Inherited from parent classes: // void send(std::string msg); // void receive(); }; Sending and receiving data asynchronously has been implemented now once and for all in the sender and receiver template classes. As the implementation doesn't differ for Boost.Asio I/O objects they can be reused. And if we had concepts already in C++ the mixins could be based on them. It all seems to fit nicely together. While there are some problems, too, I haven't made my mind yet if these Boost.Asio mixins are an improvement or make code more complicated. I'm not asking about mixins in general but wonder if anyone had a good or bad experience using them with Boost.Asio? Or are all Boost.Asio users simply calling the very same async_write() and async_read() functions again and again, creating yet another buffer, checking again the error code in the handlers etc.? Boris

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Re: [Boost-users] iterators must go
by John Dlugosz 11 May '09

11 May '09

> Date: Sun, 10 May 2009 09:24:42 -0400 > From: Neal Becker <ndbecker2(a)gmail.com> > Subject: [Boost-users] iterators must go > To: boost-users(a)lists.boost.org > Message-ID: <gu6kiq$2km$1(a)ger.gmane.org> > Content-Type: text/plain; charset="US-ASCII" > > Interesting presentation: > > http://www.boostcon.com/site- > media/var/sphene/sphwiki/attachment/2009/05/08/iterators-must-go.pdf > ******************************************** Re slide #21, he didn't mention the biggest one. I had a rather negative reaction to the design when I first saw the proposal and design that was to become the STL. The two iterators of a range have no connection to each other, and it is easy to get them mixed up with no way to test that the second is in the same collection as the first. Rather than (begin,end), I much prefer (begin, length) as a specification. And in implementation, iterators are literally as bad as pointers. I've preached that they must be treated like pointers, hidden away behind walls of encapsulation. When I first saw Boost ranges, I thought that was indeed much better. Way back when, abstracting a "range" and still allowing more generality was way beyond the ability of templates or template programmers. Slide #26: Yes! That discussion should have been had way back when. But the fait accompli of an existing library to serve as a starting point, and politics, shut down any hint of backtalk. Slide #47: shades of Perl 6...makes me think how the previous few slides of operations on ranges is like Perl. (#48) But in Perl6, even "Int" types can hold exceptional values, so list.size() would have no trouble returning Inf. --John (sorry about the footer; it's 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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Re: [Boost-users] [regex] problem with linking to boost_regex
by Phani Deepak Parasuramuni 11 May '09

11 May '09

>n addition , I believe that the correct option is >-lboost_regex-gcc43-mt, since gcc will add the >lib prefix automatically. Thanks, This solved the problem. >In Christ, >Steven Watanabe

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Re: [Boost-users] boost::asio and boost::statecharts newbie
by Marat Abrarov 11 May '09

11 May '09

Dear, Dave It's very interesting to see ASIO and FSM integration (I'd always been confused how to use them together). I haven't seen your code, but you can see mine: https://sourceforge.net/projects/asio-samples/. It's without FSM but with serial port too (Windows, may be Linux/Unix). The main concept is async active object(s) (techniques of their creation and usage on the top of ASIO) with external (user) async operations and internal ones (internal loops of async operatins). Also I tried to heavily use custom memory allocation (to reduce memory allocator calls which slows down multithreaded environment). The code isn't clean enough but it works fine. Best regards, Marat

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[1.38.0] date_time compile error on Solaris 10 Sun Studio 11
by mojo_risin 11 May '09

11 May '09

Hi, The following code: date now(day_clock<date>::local_day()); produces this error: "Error: No parameters provided for template." Any idea? Thanks in advance, Paulo -- View this message in context: http://www.nabble.com/-1.38.0--date_time-compile-error-on-Solaris-10-Sun-St… Sent from the Boost - Users mailing list archive at Nabble.com.

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Easy Build and Install
by Rodolfo Federico Gamarra 11 May '09

11 May '09

Hi all, I've downloaded boost_1_39_0.tar.gz and proceeded as told in http://www.boost.org/doc/libs/1_39_0/more/getting_started/unix-variants.html When the last step (./bjam install) was finished, I didn't find a "lib" directory within my prefix path (as told in that page and by ./bootstrap.sh --help). After looking for a while I found the libraries in "/lib". Taking a look at the bootstrap.sh file I noticed # Setup paths if test "x$EPREFIX" = x; then EPREFIX="$PREFIX" fi if test "x$LIBDIR" = x; then LIBDIR="$EXPREFIX/lib" fi Note that for building "LIBDIR" "EXPREFIX" is used instead of "EPREFIX", the former one does not appear anymore in the file. It seems that there was a typo. Thanks a lot. -- Rodolfo Federico Gamarra

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(De-) Serialization with constructor arguments
by Damien Hocking 11 May '09

11 May '09

Hi all, I'm using boost::serialization in a project and I was wondering if there's a way to deserialize through a non-default constructor that takes an argument. All the examples I've seen use default constructors. Damien

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Boost ASIO build info (Topic 3)
by Dave Mazzoni 10 May '09

10 May '09

> 3. building asio tutorial examples (Paul Sutcliffe) > ---------- Forwarded message ---------- > From: Paul Sutcliffe <psutclif(a)it.uts.edu.au> > To: boost-users(a)lists.boost.org > Date: Sun, 10 May 2009 22:17:17 +1000 > Subject: [Boost-users] building asio tutorial examples > I'm trying to build the asio tutorial code > http://www.boost.org/doc/libs/1_38_0/doc/html/boost_asio/tutorial.html > > Is there a make file anywhere or perhaps a command line example showing > exactly what libs are needed? > thanks Here's a Makefile that I use for building a project with boost::asio libs > BOOST_INCLUDE=/usr/local/include/boost-1_39 > BOOST_LIB=/usr/local/lib/boost-1_39 > LIBS=/usr/local/lib/libboost_system-gcc42-mt-1_39.so.1.39.0 > CC=/usr/bin/g++ #Path to your g++ compler: type *'which g++*' to find out > > all: serial_test > > serial_test: main.o serial_asio.hpp serial_asio.o > $(CC) -I $(BOOST_INCLUDE) -L $(LIBS) main.cpp \ > serial_asio.o -lboost_system-gcc40-mt -t -o serial_test > > main.o: main.cpp > $(CC) -I $(BOOST_INCLUDE) -c main.cpp -o main.o > > serial_asio.o: serial_asio.cpp > $(CC) -I $(BOOST_INCLUDE) -c serial_asio.cpp -o serial_asio.o > > > clean: > rm -f *.o serial_test > > And here's what's in my *serial_asio.hpp:* #ifndef SERIAL_ASIO_HPP #define SERIAL_ASIO_HPP #include <boost/asio.hpp> #include <boost/enable_shared_from_this.hpp> #include <boost/shared_ptr.hpp> #include <boost/bind.hpp> #include <boost/asio.hpp> #include <boost/asio/serial_port.hpp> #include <string> #include <iostream> #include <sstream> using namespace boost; using namespace std; enum { Max_read_length = 256 }; class Serial_connection { public: Serial_connection( boost::asio::io_service& io_service ); ~Serial_connection(); typedef boost::shared_ptr<Serial_connection> pointer; static pointer create ( boost::asio::io_service& io_service ); void read_start(); private: void handle_write ( const boost::system::error_code& an_error, size_t bytes_transferred ); void handle_read ( const boost::system::error_code& an_error, size_t bytes_transferred ); boost::asio::serial_port serial_port_; boost::asio::io_service& io_service_; char read_msg_[Max_read_length]; boost::asio::streambuf stream_buffer_; char delimiter_; stringstream ss_; bool flip_flop; }; #endif If you need more information, I'd be glad to post it here. I think this answers your question regarding "builds". Regards, Dave > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

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[wave] How to enumerate all function declarations in a preprocessed header
by David Larsson 10 May '09

10 May '09

Hi! I'm trying to use booost.wave to parse some C headers and generate code for each function declaration found. How would you write code that identifies all function declarations? Is there any higher level structure that helps me finding this or do I need to create some state machine that matches the pattern for a function declaration from what's found in the token iterator? Thanks /David

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