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[regex] Support for named captures?
by Olenhouse, Jason 30 Jun '06

30 Jun '06

I've read the boost regex docs and I don't see anything about named captures. I see information about captures using the number notation, $1, $2, etc. I'm assuming that the regex lib doesn't support named captures, correct? I looked at the spirit docs and didn't see any mention of it in the regex parser portions. I'm guessing that spirit doesn't support it either, correct? And by not supporting it I mean an out-of-the-box solution with the regex parser. I'm sure something more complicated than I could understand is possible with spirit. I can post to that mailing list if no one here knows. I'm trying to regex syslog messages for specific pieces of data. Depending on what systems send me syslog messages the order of the pieces of data may be different. I'd like a solution where I can ask for the specific piece of data explicitly, instead of having to remember that on system A dataItem1 is $1, but on system B it's $2. I will always have the same fields that I look for and that won't change. I'm trying to not complicate my database schema or the make the client's use any more difficult since they're the ones that write the regex statement. If named captures with the regex lib or with spirit aren't supported, any ideas on how this might be done would be appreciated. I'm stuck on boost 1.32, but have been looking for a good excuse to force our development dept. to a newer release. -Jason

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Re: [Boost-users] Replacing C functions with boost::function for callback functions in OpenGL
by Baranowski, Daniel 30 Jun '06

30 Jun '06

[snip] > Now I thought I would put all the variables and functions into a class > and use that in the main. Here is where I am getting stuck on the use of > boost::function. I changed the code to look something like the > following: > > class MyMain { > int a; > float b; > > void display() > { > ... display code calls ... > } > } > > int main (int argc, char **argv) > { > MyMain m_ref; > boost::function<void()> disp_func = boost::bind ( > &MyMain::display, &m_ref ); > glutDisplayFunc ( disp_func ); > } [snip] Maybe you could leave the display function as it was before, have OpenGL call that function, and then have Display call disp_func(). Something like this (though I haven't actually tried it): typedef boost::function<void()> DisplayFuncType; DisplayFuncType CurrentDisplayObject; class MyMain { int a; float b; void display() { ... display code calls ... } } void display () { if(!CurrentDisplayObject.empty()) CurrentDisplayObject(); } int main (int argc, char **argv) { MyMain m_ref; CurrentDisplayObject = boost::bind ( &MyMain::display, &m_ref ); glutDisplayFunc (display); } Let me know if that works out for you! I'd be interested to know. I think that's a good idea, BTW. Daniel ********************************************************************************************** Disclaimer - This email and any files transmitted with it are proprietary and may contain privileged or copyright information. You must not present this message to another party without gaining permission from the sender. If you are not the intended recipient you must not copy, distribute or use this email or the information contained in it for any purpose other than to notify us. If you have received this message in error, please notify the sender immediately, and delete this email from your system. We do not guarantee that this material is free from viruses or any other defects although due care has been taken to minimize the risk. eSafe scanned this email for viruses, vandals and malicious contentAny views expressed in this message are those of the individual sender, except where the sender specifically states them to be the views of LSI. **********************************************************************************************

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[asio] has anybody enabled SSL in a large project?
by Scott 30 Jun '06

30 Jun '06

We've been using ASIO for a while now in a large project and it's been great. I've recently been tasked to add optional SSL support between our client and server. Since there are some SSL classes in ASIO I started with the ASIO SSL example code and got that working. I then pretty much copied the relevant pieces from the sample code over to our project to see if it would work there. Using the same certificates and key files from the sample code, I added the handshaking and got our client and server to communicate. It all seemed great at first, because it seemed to seemlessly work. But eventually the communications break down. I either get asserts in my code from unexpected data in the stream, or the client hangs waiting for data that never appears or any of several different stream problems. It's rarely the exact same thing. But it eventually always fails. Especially on long sustained transfers. I have no idea what I might be doing wrong. There's really no documentation at all on ASIO and SSL. For all I know, it might be a problem with the SSL implementation in ASIO. Which brings me to my question - has anybody successfully used the SSL classes in ASIO on complex projects? If so, that would point to a problem in my code somewhere. Perhaps I need to do more than just add the initial SSL handshake (aside from using the SSL stream beyond that point)? Thanks, Scott

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Re: [Boost-users] multi_array: creating a view to a single element
by Baranowski, Daniel 30 Jun '06

30 Jun '06

[snip] > [snip] > > Basically, I have a 2 Dimensional array and I > > would like to be able to access the center of that array > > using a variable that maps to some index (for example, > > element[3][3] in a 7x7 array). > [snip] > > Would T & center = element[3][3] be satisfactory? > > I don't think multiarray supports any type of reallocation after > construction, so it should be ok. > > Sohail Thanks Sohail. While you can resize a multi_array, I won't be, so it's not an issue. What you've got is pretty obvious, I guess I was just had gone too far down the "view" path to see the simple answer! Thanks also to Cromwell for chiming in too as that is definitely a good, more generic approach, but probably overkill for my particular instance. But, still good to know! Daniel ********************************************************************************************** Disclaimer - This email and any files transmitted with it are proprietary and may contain privileged or copyright information. You must not present this message to another party without gaining permission from the sender. If you are not the intended recipient you must not copy, distribute or use this email or the information contained in it for any purpose other than to notify us. If you have received this message in error, please notify the sender immediately, and delete this email from your system. We do not guarantee that this material is free from viruses or any other defects although due care has been taken to minimize the risk. eSafe scanned this email for viruses, vandals and malicious contentAny views expressed in this message are those of the individual sender, except where the sender specifically states them to be the views of LSI. **********************************************************************************************

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[serialization] customize xml archive
by Jabe 30 Jun '06

30 Jun '06

hello, i try to create a xml archive that fit our needs. the default xml serializer handles not the format i would like to implement. some differences are: - primitive types (int, float, ...) should be written as xml attributes - array types should not provide any parent xml element, all array elements will be serialized as childs from the element containing the array - tagnames should always contain the classname - parent classes should create a new xml child element - and some more, but so far as an example the default xml code looks like this: <foo class_name="Class1" class_id="1"> <name>example</name> <container class_id="2"> <count>2</count> <item class_id_reference="2"> <a>123</a> </item> <item class_id_reference="3" class_name="Class3"> <b>456</b> </item> </foo> i would like this output: <Class1 role="foo" name="example"> <Class2 role="container" a="123" /> <Class3 role="container" b="456" /> </Class1> is that possible with the current boost::serialization and boost::archive libraries? i tried to derive all baseclasses of xml_oarchive and reimplemented it, without success. maybe a first question: why don't i get a classname for each serialized object in common_oarchive::save_override(const class_name_type & t, int)? sometimes i get a class_id, sometimes a class_reference_id and so on. classnames are offered rarely. regards, jabe

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Re: [Boost-users] multi_array: creating a view to a single element
by Sohail Somani 29 Jun '06

29 Jun '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Cromwell Enage > > > Would T & center = element[3][3] be satisfactory? > > Try: > > typename boost::multi_array<T,2>::index > index1 = (element.index_bases()[0] > + element.strides()[0]) / 2; > typename boost::multi_array<T,2>::index > index2 = element.index_bases()[1]; > + element.strides()[1]) / 2; > T& center = element[index1][index2]; To make it general, yes. > > I don't think multiarray supports any type of > > reallocation after construction, so it should > > be ok. > > boost::multi_array has a resize() function, if that's > what you're afraid of. See > <http://www.boost.org/libs/multi_array/doc/reference.html> In this case, obviously center would not be center anymore, so the OP should beware.

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[date_time] Get age in years
by Jason Dolan 29 Jun '06

29 Jun '06

I'm trying to get the age of someone in Years and/or months and/or days. I've tried: date_period dp(day_clock::local_day(), birthdate); cout << "You are " << dp.length() << " old" << endl; But that only calculates days. Is there a static function available that will turn days into months. and days into years? Thanks -Jason

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Re: [Boost-users] multi_array: creating a view to a single element
by Sohail Somani 29 Jun '06

29 Jun '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Baranowski, Daniel > Sent: Wednesday, June 28, 2006 7:55 PM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] multi_array: creating a view to a > single element > [snip] > Basically, I have a 2 Dimensional array and I > would like to be able to access the center of that array > using a variable that maps to some index (for example, > element[3][3] in a 7x7 array). [snip] Would T & center = element[3][3] be satisfactory? I don't think multiarray supports any type of reallocation after construction, so it should be ok. Sohail

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Embedded Python issue
by Trevor M Cickovski 29 Jun '06

29 Jun '06

Hello, I am trying to run some embedded Python code, following the boost.Python tutorial. What I was hoping to do was import some external modules. So basically in my .cpp file I have: Py_Initialize(); object main_module(( handle<>(borrowed(PyImport_AddModule("__main__"))))); object main_namespace = main_module.attr("__dict__"); try{ handle<> ignored((PyRun_String( "import Numeric\n" // Other Python commands , Py_file_input , main_namespace.ptr() , main_namespace.ptr()) )); } catch(error_already_set) { PyErr_Print(); } // Finish the Python Interpreter Py_Finalize(); However when I 'import Numeric', I get an undefined symbol: Traceback (most recent call last): File "<string>", line 4, in ? File "/afs/nd.edu/user25/tcickovs/Research/PYTHON/lib/python2.4/site-packages/Numeric/Numeric.py", line 91, in ? import multiarray ImportError: /afs/nd.edu/user25/tcickovs/Research/PYTHON/lib/python2.4/site-packages/Numeric/multiarray.so: undefined symbol: PyExc_ValueError Now if I just run python from the command line and call 'import Numeric' everything is fine. Does anyone have any idea what I need to do differently if I use Boost? Thanks for the help, Trevor -- ------------------------------------------------------- This is your time, this is your dance Live every moment, leave nothing to chance. Swim in the sea, drink of the deep Embrace the mystery of all you can be. - Michael W. Smith, "This Is Your Time"

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Re: [Boost-users] boost 64bit support on windows x64 on amd64 hardware
by Sohail Somani 29 Jun '06

29 Jun '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of ChuMing > > > > On Tuesday, June 27, 2006 at 08:42:30 (+0000) Chu-Ming Ng writes: > > > > > >Hi, > > > > > >I am porting some code that uses boost from 32-bit to the > 64-bit platform > and > > >would like to know if the boost library supports this platforms. > But is there anyone I can ask to for official > confirmation? You can confirm it for yourself by looking at the regressions linked from the www.boost.org page. Or run them yourself.

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