March 2013 - Boost-users - lists.boost.org

threaded stopwatch or count down timer
by Sean Farrow 03 Mar '13

03 Mar '13

Hi all, I'm currently writing an application that requires either a stopwatch or a countdown timer. Is such a thing available in boost? Any help appreciated. Regards Sean.

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variant with shrink
by Niitsuma Hirotaka 02 Mar '13

02 Mar '13

boost::variant should be variant<int,int> => int variant<int,double> => double variant<int,boost::rational<int> > => boost::rational<int> variant<int,double,std::string> => variant<double,std::string> I wrote such extension https://github.com/niitsuma/variant_shrink

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Fwd: Describing "traits" of a class's members
by Chris Stankevitz 02 Mar '13

02 Mar '13

Hello, A week ago I started a thread here called "Can boost help me organize/parse lots of binary data?" As people started offering help, it because clear I had no idea what I was trying to ask. I come back with a clear question. The attached file defines: 1. TCPosition: an object that describes a position 2. TCDoubleTraits: an object that describes characteristics of a parameter represented as a double 3. TCUnsignedTraits: an object that describes characteristics of a parameter that is represented as an unsigned 4. TCPositionTraits: a collection of TC*Traits plus some boost::function magic to extract parameters from a TCPosition. 5. TCPositionTraits::PrintValues: a function that allows the user to print all values of a TCPosition The motivation for this round-about way of printing the parameters of a "position" is that I have to deal with some objects that have lots of parameters and I would like one central place where I define the characteristics of the values and their order. In this example, that place is TCPositionTraits. In my real life example I will want to store traits such as the way the data is encoded and the way in which the data needs to be transformed into "human readable" format. Question: Can you modify the attached program so that the object TCPositionTraits holds all the traits for the TCPosition object. Not just the traits for the "double" parameters, as is currently the case. Notably missing from TCPositionTraits is a reference to TCPosition::mSteps. Difficulty: This is a difficult question to answer due to the fact that TCPositionTraits has hard-coded in it the keyword "double". I cannot figure out how to remove this. Bonus: Bonus points if your answer looks something like "yes it is possible if you start using a boost concept which you apparently are not aware of". Note: You'll need the C++11 brace-initialization capability to compile this. I used "g++ -std=c++0x test.cpp" with gcc 4.6.3. Thank you, Chris

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[boost] Minimum GCC required to support build
by Michael Powell 02 Mar '13

02 Mar '13

Hello, What is the minimum GCC I will need to compile boost? All of it if I can, or majority of it? And then what might I be giving up? Specifically, I am working with GCC 4.4.3 in Ubuntu LInux 10.04 LTS. I'd like to upgrade that to 4.7 if not 4.8 for C++11 features. I've read it can be done, but that makes me nervous upgrading such a crucial part of the Linux tool chain. Also, bearing in mind that we will need to cross compile to ARM5: I believe crosstool-ng might be the thing that enables that. Any insights would be appreciated. Thank you. Regards, Michael Powell

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[CONFIG] static const definitions
by John M. Dlugosz 01 Mar '13

01 Mar '13

On 3/1/2013 3:09 AM, boost-users-request-at-lists.boost.org |Boost/Allow to home| wrote: > But to be honest that looks like a BOOST_WORKAROUND rather than a full on > config macro to me - the reason being that it just looks like a compiler > specific bug plain and simple, rather than a missing feature. So maybe I'm looking in the wrong place? But, I don't find anything in the docs for "Workaround" other than the Config library and Boost.Compatibility which is for bad std headers.

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[CONFIG] static const definitions
by John M. Dlugosz 01 Mar '13

01 Mar '13

On 2/27/2013 3:13 PM, boost-users-request-at-lists.boost.org |Boost/Allow to home| wrote: > I think it would be great to have a boost macro to test. > If no one else is aware of a readily-available macro in boost config, > maybe you can log a bug and provide a patch to get the ball rolling? > > Brian I've never done that before for Boost. Is there a guide you can point me to, on the correct procedures to follow?

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building boost with a specific msvc runtime
by Tom K. 01 Mar '13

01 Mar '13

I'm trying to get a consistent VC++ runtime for distribution, but I cannot find anything getting boost/bjam to cooperate. I have successfully compiled libcurl and UnitTest++ with the method in this link. http://tedwvc.wordpress.com/2009/08/10/avoiding-problems-with-vc2005-sp1-se… The idea being that you include a header in each file and then it will only have that one runtime dependency. b2 has options for setting cxxflags, though they do not seem to honor my /FI compile option to use the header and force the correct runtime. I assume that they are using something else. I suppose boost doesn't use the msvc flags. How should I accomplish this?

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statistics: exact median, first and third quartile
by gast128 01 Mar '13

01 Mar '13

Hello all, I was looking if Boost would support basic statistics calculated from a container of values: - Boost.Accumulators supports these statistics but only in an incremental way. This is nice, but now we want exact values since the containers are small (i.e. less than 100 elements) - Boost.Math: support only for distributions Did I overlook something or is this just not supported?

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[geometry] getting overlay_invalid_input_exception thrown from union operation
by John Lilley 01 Mar '13

01 Mar '13

I am seeing a overlay_invalid_input_exception thrown from has_self_intersections when calling the union() operation. Does indicate an internal error, or have I not conditioned my input properly? My test is, taking the TIGER 2010 counties file for Alaska, and repeatedly calling union() on the polygons. There may be some issues that I can think of: 1) Island chains are represented as one big multi-ring polygon in the source shape file. When I convert to boost polygon, I set the first ring as the outer, and all others as inners. 2) Aleutians cross the 180-meridian. I am, however, taking steps to force all latitudes into the negative range, but that logic may need to be checked.

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undefined reference to `boost::filesystem3::path::stem() const
by Witold E Wolski 01 Mar '13

01 Mar '13

Hi, I am linking against all these libs /usr/lib/libboost_filesystem-mt.so;/usr/lib/libboost_system-mt.so;/usr/lib/libboost_iostreams-mt.so;/usr/lib/libboost_thread-mt.so;/usr/lib/libboost_regex-mt.so;/usr/lib/libboost_program_options-mt.so (boost 1.46 on ubuntu 12.04) but still I am getting the following link error undefined reference to `boost::filesystem3::path::stem() const help appreciated regards -- Witold Eryk Wolski Triemlistrasse 155 8047 Zuerich

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