March 2005 - Boost - lists.boost.org

RE: [boost] Re: Re: Re: Iostreams Question: Bestwaytooutputtowin32debugger\outwindow ?
by Brian Braatz 01 Mar '05

01 Mar '05

> -----Original Message----- > From: boost-bounces(a)lists.boost.org [mailto:boost-bounces@lists.boost.org] > On Behalf Of Jonathan Turkanis > Sent: Monday, February 28, 2005 10:26 PM > To: boost(a)lists.boost.org > Subject: [boost] Re: Re: Re: Iostreams Question: > Bestwaytooutputtowin32debugger\outwindow ? > > Reid Sweatman wrote: > >> -----Original Message----- > >> From: boost-bounces(a)lists.boost.org > >> [mailto:boost-bounces@lists.boost.org] On Behalf Of Jonathan Turkanis > > >> Okay Brian, > >> > >> The following apparently works, but when OutputDebugString is > >> called I don't see any output. I'm not sure if the previous > >> version worked or not; I've run out of time for now. > > > > I didn't see most of this thread, and may be totally off-base here, > > but you need to use a tool that can intercept the output from > > OutputDebugString(), > > as that function assumes there's a debugger attached to its process; > > if there's no attached debugger, it attempts to use the Windows system > > debugger, which must be both installed and active. However, I like > > SysInternals' DebugView, both because it's well-written and easy to > > use, and because it's free. Very lightweight alternative to invoking > > a full debugger when that would be overkill. It can do kernel-mode > > debugging, too, which is a major plus, if you need that; got a copy > > running on my other machine right now. www.sysinternals.com. And if > > this is not to the point, or you already know all this, bear in mind > > that I only had this post available, and skimmed it pretty cursorily, > > and please just disregard my post. > > Thanks for the info. > > The main point of the thread was to show how to write a sink with a built- > in > line-ending filter, so the user doesn't always have to add one explicitly. > > Jonathan > [Brian Braatz Writes:] Yes. (sorry if I got off base)- the question relevant to boost \ iostreams was this- Given a device which has different line termination than \n, how do you handle it in such a way that allows for that device to be able to interpret std::endl so it works as the user would expect. (and so the code you write using the sink makes sense to the user) I happen to be using win32's outputdebugstring, but the same issue applies for "printing" to a windows edit control. The same issue might also apply to a daisy wheel printer. And, personally, I think boost should support daisy wheel printers (grin)....

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Re: Re: Is there any way to get typeid() to return the derived class name?
by Chris Just 01 Mar '05

01 Mar '05

Jody Hagins wrote: >> I've been looking through the boost library and I haven't been able to >> find anything that works like typeid() that returns the exact (i.e. >> derived) class name instead of just the base class. >> I want to compare two derived classes to make sure that they are of >> the same class, but typeid() only returns the name of the base class. >> >> If there is a boost function that does this, or if someone has a way >> of doing it could you please point me in the right direction? > > Funny about timing... > > I think I can answer your question, but I must answer with another > question. What do you mean by "typeid() only returns the name of the > base class?" This is surely not the case for polymorphic types, at > least according to the standard. Maybe if you post a bit of code, which > represents what you are trying to accomplish, I can help... I'm using MS Visual C++ 6.0. This is what I'm doing: CBase { ... }; CDerived : public CBase { ... }; CSomething { public: CSomething( const CBase& base ) : m_Base( base ) {} CSomething& operator=( const CSomething& rhs ) { if ( typeid( m_Base ) != typeid( rhs.m_Base ) ) // This never fails. { throw exception(); } } private: CBase& m_Base; }; When I look at the type_info object's name(), it always returns "CBase", even if it's actually a CDerived object. __________________________________ Do you Yahoo!? Yahoo! Mail - now with 250MB free storage. Learn more. http://info.mail.yahoo.com/mail_250

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Select overload revisited
by Daniel James 01 Mar '05

01 Mar '05

I was thinking about the overload resolution functions suggested a while back by Arturo Cuebas[1] and had no idea why the compiler needs to be told the number of parameters in the first place. So I took his code and removed the numbers from functions, and it worked (in gcc). I guess that it didn't work for him because of his compiler. Well, it almost worked. Sometimes there is more than the one function that fits the template parameters. So I kept the numbered overloads to be able to match them. It might be possible to get these to work without the number of parameters by making the compiler prefer overloads for functions with less parameters. I've attached a demo. Daniel [1] http://lists.boost.org/MailArchives/boost/msg69451.php

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Added "restore" member functions to ios_state
by Daryle Walker 01 Mar '05

01 Mar '05

See "BOOST_ROOT/boost/io/ios_state.hpp," CVS version 1.3, and "BOOST_ROOT/libs/io/doc/ios_state.html," CVS version 1.7, if they uploaded OK. (I had a temporary[?] wait on my own lock.) -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT hotmail DOT com

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build boost1_32_0 lib on solaris 9.
by JIM WANG, BLOOMBERG/ SKILLMAN 01 Mar '05

01 Mar '05

Hi all, i am building build libraries for version 1_32_0 on solaris 9 but running into many errors. For example, there are similar errors like in compiling serialization/build/../src/xml_wgrammar.cpp:14: #error "wide char i/o not supported on this platform" The command i used is: bjam "-sTOOLS=gcc" --with-python-root=/usr/local/Python2.3.2 install Are there any detailed procedures for build on solaris 9? Thanks

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Is there any way to get typeid() to return the derived class name?
by Chris Just 01 Mar '05

01 Mar '05

Hi, I've been looking through the boost library and I haven't been able to find anything that works like typeid() that returns the exact (i.e. derived) class name instead of just the base class. I want to compare two derived classes to make sure that they are of the same class, but typeid() only returns the name of the base class. If there is a boost function that does this, or if someone has a way of doing it could you please point me in the right direction? Thanks, Chris Just __________________________________ Do you Yahoo!? Yahoo! Mail - You care about security. So do we. http://promotions.yahoo.com/new_mail

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[mpl] sequence details
by Tobias Schwinger 01 Mar '05

01 Mar '05

Hi, What is the best way to convert the result of a mutating mpl intrinsic metafunction (such as 'mpl::push_back', for example) to numbered form ('vectorN<a1,a2,..>') ? I tried using the type-member (which only works on some compilers - not with GCC for example) and figure 'copy' could probably do the trick (but is a quite complex operation) so there might be a better recipe for this. In a library I'm currently working on, I use a decorator pattern to make a class model of a sequence it holds (i.e. give it a tag type member and specialize *_impl with delegate semantics). After applying the delegate metafunction I need the sequence in a form I can match with partial specialization. Thanks for your help, Tobias

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[numeric/conversion] doc's example not up-to-date
by Samuel Krempp 01 Mar '05

01 Mar '05

Is the documentation for numeric/conversion finalized yet ? It seems that at least the code sample in numeric/conversion/doc/numeric_cast.html hasn't been kept up-to-date. This sample 1/ includes inexistent header 2/ uses boost::bad_numeric_cast instead of boost::numeric::bad_numeric_conversion and same for the other exception classes and most of all : 3/ // This works, because unsigned integral types cannot cause overflow. unsigned char c=numeric_cast<unsigned char>(l); But this line does raise an overflow exception (as it should, I guess). I guess the comment was about unsigned types implementing modulo-arithmetics, but in the end does numeric_cast check for unsigned overflows, or not ?? -- Samuel

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Re: [boost] Re: review of FSM nears to the end - any more reviews?
by Iain Hanson 01 Mar '05

01 Mar '05

Hi, On Tue, 2005-03-01 at 02:56 +0100, Pavel Vozenilek wrote: > "Jonathan Turkanis" wrote: > > [snip] > > I think the review should be extended. If you do so, > > I will commit to writing a > > review, even though I don't know much about FSMs. I am also working on a review of the library and will submit it in a couple of days. > > > > I have not read the FSM reviews yet, but unfortunately IMO even if all the > > reviews are very favorable there simply have not been enough yet to > > justify > > accepting a medium sized library. It looks to me like only four people > > other > > than you and Andreas have posted on FSM so far. I agree. > Perhaps it could be interpreted: as the library reached > mature state where everybody's happy enough. > No. I think that silence is probably better interpreted as apathy or I don't have enough time to review something of this size and do it justice. I would not like to see libraries adopted into boost by default when they have not received a decent review. Just my 2p worth. > I feel current model of reviews is not designed > to deal with big libraries well. > I very much agree. /ikh

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mpl::vector & push_back question ?
by Zhang, Karl 01 Mar '05

01 Mar '05

Hi: When I am reading mpl source code. I notice that push_bck algorithm, Look as following: template<> struct push_back_traits< aux::vector_tag > { template< typename Vector, typename T > struct algorithm { typedef vector_node<T,Vector> type; }; }; My question is: when generate new sequence, vactor_node<T, vector>, why skip "size" argument ? How does it increase sequence size in push_back? About push_front, It increase sequence size when generating new sequence. Regard Karl

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