- Boost-users - lists.boost.org

[DateTime]: Parsing RSS publishing dates
by Roland Bock 20 Sep '08

20 Sep '08

Hi, when parsing RSS, there are many date formats. For example: Fri, 19 Sep 2008 16:49:00 EDT Sat, 20 Sep 2008 11:25:00 +0100 I would like to write a single function which takes care of parsing this stuff and returns a GMT time. The attached code can take care of the format with the exception of the time zone. From what I read in the documentation and various other sources I take it that time zones like EDT cannot be automatically handled by BoostTime. But I would assume that it is not a big deal to take care of something like +0100? Sadly, I have no idea how to do that? Thanks and regards, Roland

2 2

a memory output stream
by Lloyd 20 Sep '08

20 Sep '08

Hi, I am a newbie and new to boost. In my program there is loop and in this loop it is reading a buffer full of data in each iteration, i want to append this data to a buffer. How can I do this with boost? sample code =========== int l=0; char* buff=new char[1024]; while(1) { //Here it is reading from a gziped buffer l = boost::iostreams::read(in,buff,1024); if(l != 1024) break; //how can I append this buff to a memory buffer thus to get a fully uncompressed data in another buffer?. } Thank you very much, Lloyd ______________________________________ Scanned and protected by Email scanner

1 0

Re: [Boost-users] Why something like #ifndef BOOST_MPI_HPP is alwayscapitalized?
by Peng Yu 19 Sep '08

19 Sep '08

Hi, I'm wondering how you would handle the following case. Suppose I have a set of mathematical formulas that has both bigger case and lower case variables (such as both 'X' and 'x'). This situation is pretty common. In order to implement them in C++, I could either write bigger cases as well as lower cases in C++, which is not in consistence with the convention that you mention. Or I have to convert bigger cases to lower cases, which is also not easy to read, as it is different from the original mathematical form. Which approach would you prefer? I would prefer the former one. Therefore, the convention is not followed. Thanks, Peng On Fri, Sep 19, 2008 at 3:06 PM, Peter McGill <petermcgill(a)goco.net> wrote: > It is a standard C++ convention to capitalize #defines and constants like > that. > There is no technical reason, it just makes them easy to identify. > Following common practice makes boost more accessible to many people. > > You should never have two header files which only differ in case. > Some file systems (ie. dos/windows) do not allow files which only differ in > case. > Technical reasons aside, having two files which only differed in case would > be > potentially hard to understand. It is much clearer to give them different > names. > > In both cases it is important to write understandable code, it is easier to > maintain. > > Peter McGill > IT Systems Analyst > Gra Ham Energy Limited > > > -----Original Message----- > > From: boost-users-bounces(a)lists.boost.org > > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Peng Yu > > Sent: September 19, 2008 3:47 PM > > To: boost-users(a)lists.boost.org > > Subject: [Boost-users] Why something like #ifndef > > BOOST_MPI_HPP is alwayscapitalized? > > > > Hi, > > > > In most of the C++ header files I've seem, a macro like the > > following is used to guard repetitive inclusion of the file. > > I'm wondering why it is always in upper case. Why not make it > > the same case as the file name? > > > > What if there are two header files on is in lower case, the > > other is in upper case? > > > > Thanks, > > Peng > > > > #ifndef BOOST_MPI_HPP > > > > > > > >

3 2

Why something like #ifndef BOOST_MPI_HPP is always capitalized?
by Peng Yu 19 Sep '08

19 Sep '08

Hi, In most of the C++ header files I've seem, a macro like the following is used to guard repetitive inclusion of the file. I'm wondering why it is always in upper case. Why not make it the same case as the file name? What if there are two header files on is in lower case, the other is in upper case? Thanks, Peng #ifndef BOOST_MPI_HPP

2 1

Re: [Boost-users] [test] memory access violation by calling <<-operator
by trashing＠gmx.net 19 Sep '08

19 Sep '08

> Why don;t you try to use output_test_stream instead. It's specifically > designed for this purpose. 'Cause, i don't know of them. But now I'm using output_test_stream . FYI: The stream wasn't the problem. I've testing a library and my test code and the library weren't compiled with the same compile flags. greetz, Manuel

1 0

offtopic: std C++ / STL / boost-friendly UI framework?
by Ákos Maróy 19 Sep '08

19 Sep '08

Hi, This is a bit of an offtopic question, but I wonder if there are any / if there will be any standard C++ / STL / boost friendly UI frameworks? When I look at UI libraries, like Qt or MS MFC, they all have their own constructs to generic concepts that are well (and better) covered in standard C++ / STL / boost. Like they have QArray, CArray, QFile, etc. etc. This is bad for a number of reasons. For one, one has to write a lot of adaptation code, like taking values from an STL iterator and filling a QArray with it, or the other way around. The second, much worse is that sloppy developers tend to stick with the UI-library specific constructs, and thus dig themselves into non-portable (in the case of MFC), or library- and license-specific (Qt which in GPL) code. And they are usually quite resistant to reasoning on using more generic and portable code for the same purpose. Thus I wonder - does anyone foresee a portable UI library which would be based on standard C++ / STL / boost? By this I mean that the generic constructs would be taken from here, and the UI library would really only contain things specific to UIs? Akos

8 8

[test] output_test_stream undocumented behaviour
by M. Siebeneicher 19 Sep '08

19 Sep '08

Hi boost-users, I've mentioned that after calling output_test_stream.is_empty() the stream will be cleared. If you subsequently want to compare the stream with output_test_stream.is_equal(...) this doesn't work, because the stream is empty. Is this a bug or a feature? I couldn't find a description of the behaviour in the documentation. greetz, Manuel -- Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer

2 1

[mpl] equal_to compile problems
by Olaf Peter 19 Sep '08

19 Sep '08

Hi, my first steps in mpl are very rough. I have enum { RELEASE_LEVEL = (10 << 4), ... }; and want to check on an appropriate enum number: #include <boost/mpl/equal_to.hpp> #include <boost/mpl/int.hpp> #include <boost/mpl/placeholders.hpp> namespace { namespace mpl = boost::mpl; using namespace mpl::placeholders; typedef mpl::equal_to<_1, mpl::int_<0xC> >::type release_candidate; } ... if(release_candidate<RELEASE_LEVEL>::value) return a; else return b; which doesn't compile. Where is my fault and how can I fix it? Thanks, Olaf

2 2

Can boost::interprocess be somehow used to implement Solaris door functionality ?
by Kartik Mahajan 19 Sep '08

19 Sep '08

Hi I have been using Solaris DOORS in my project which is now being ported to Linux. I am extremely sorry if this is not the place to post this thread but all I am asking is " is there any boost library to make this thing possible ". I have downloaded boost 1.36 and there is this library called boost::interprocess . Can it in anyway be used to implement functioning similar to Solaris DOORS ? Here is what I want to do: Process 1 passes arguments to process to using a function say f1(arguments).. in Solaris it is called door_call. The function is executed in the process2 and then return values returned. When this happens, the process 1 returns. I don't need any ready made package etc to do this but I am just asking for suggestions as what would be the best way to implement this ? I just need some suggestions as boost is the place for expert library designers and I want to do it in the best possible way so as to learn. I am asking suggestions because I guess this thing would take time and I don't want to go in the wrong direction first and then get the right way. So that's why this thread. Thanks for your patience. Sorry if this is not the place to post this query. Thanks & Regards Kartik Mahajan

2 1

Re: [Boost-users] [test] testing protected/private methods out of test suits
by M. Siebeneicher 19 Sep '08

19 Sep '08

> M. Siebeneicher writes: > > I tried to test protected/private class methods by declaring the > > test-case-class as a friend of the class-to-test. > > Here's what we do to unit test our classes: > > #define private public > #define protected public > #include <common/Blob.hpp> > > This makes our unit testing much easier! ;-) > > Cheers, > > -- > Robert I did this before but now it doesn't work 'cause the class_to_test lies in another library than the test_case_class. greetz, Manuel -- Ist Ihr Browser Vista-kompatibel? Jetzt die neuesten Browser-Versionen downloaden: http://www.gmx.net/de/go/browser

3 2