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multi_array - problems with resize
by Craig Glasgow 08 Mar '06

08 Mar '06

Hi, I'm trying to write serialization load and save methods for multi-array. For the load method I have a function with the prototype: template<class Archive, class T, std::size_t NumDims> inline void load(Archive& ar, boost::multi_array<T, NumDims>& arr, const unsigned int file_version) This function gets called when the array is serialized and should populate the multi-array arr. However this requires re-sizing arr which apparently can only be done using the extents construct e.g. arr.resize(boost::extents[3][4][2]), but I want to be able to do this for an arbitray number of dims as with reshape. Any idea how this can be done? Regards Craig

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[Boost.Test] SD expo
by Sohail Somani 07 Mar '06

07 Mar '06

Is there going to be detailed coverage of boost test at SD expo? I couldn't find anything, but just thought I'd try the list. Thanks Sohail

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Re: [Boost-users] portable shared library loader
by David Klein 07 Mar '06

07 Mar '06

boost-users-bounces(a)lists.boost.org wrote: > hi all, > > since i've got the hint for portable uuids on this list, another > portability question ... > > i'm building a dynamic shared library loader ... currently i'm using > the dlopen api, which works on linux (and possibly on osx), for win, > there's a simiar api ... > > is there any prebuilt wrapper for that (preferable as part of boost or > in a another bsd/lgpl-style license? > > thanks ... tim there is the 'plugin' library in the boost_sandbox on sourceforge. HTH dave

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[Parameter] Constructors and more
by Johan Nilsson 07 Mar '06

07 Mar '06

Hi, I've just started playing around with Boost.Parameter. I'm in the progress of wrapping a legacy C library and some of the structs used have plenty of members, most of which have reasonable defaults. I thought that the Parameter library would be a nice fit here, but ended up with a couple of questions: 1. How can I define constructor for a class taking named parameters, without using the double parentheses syntax? The following basic idea works, but is ugly: --- ... BOOST_PARAMETER_KEYWORD(tag, minVal) BOOST_PARAMETER_KEYWORD(tag, maxVal) struct Foo { template<typename ArgPack> Foo(ArgPack& args) { m_minVal = args[minVal|0]; m_maxVal = args[maxVal|100]; } ... }; void bar() { Foo foo(( minVal = 1, maxVal = 2)); // Note double parens } --- I've experimented some with defining a parameter::parameters specification and use (the undocumented) BOOST_PARAMETER_MEMFUN, but that obviously doesn't work (forwarding, return values and constructors don't mix). It should be possible (I think) to define a BOOST_PARAMETER_CTOR macro that generate the ctor overloads and forwards to a setter method instead of the other way around. I guess I could create a free or static member function that constructs an object, but that would either force me to create heap-based objects, or invoke potentially expensive copy ctors. 2. Is there a way of detecting whether an argument was passed using position or name? Or, even better, is there a way of restricting the arguments to only be passed by name using the parameters specification? 3. Not a question really, but having a default arity of 5 seems awfully low to me. I hit that limit on first usage, and as the named parameters are supposed to be used in the interface of my wrapping library, forcing users to define BOOST_PARAMETER_MAX_ARITY "globally" feels a bit like asking for someone coming up and asking me to decode some compile errors. [I'm using the latest cvs head of boost, in combination with VC 8.0] Regards, Johan Nilsson

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Boost sBUILD Features
by Robert Vinluan 07 Mar '06

07 Mar '06

Hi All, Does anybody have a link to a page that shows all the possible features (i.e. <threading>, <runtime-link>, etc.) for -sBUILD? I searched on google and the boost documentation but I can't find a good list of all the sBUILD features. I was just curious to see if I could use -sBUILD to control building 32-bit or 64-bit versions of the boost libraries. Thanks in advance, Rob

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case insensitive less_than string comparison
by Matthias Kaeppler 07 Mar '06

07 Mar '06

Hi, I am aware that string_algo has an if_iequal functor. Is there also an equivalent for a less-than comparison? I have to compare strings ignoring the case but taking locales into account. Right now I'm calling boost::algorithm::to_lower on two copies of the original strings. I'm not so sure if this is very efficient when I'm comparing thousands of strings. Here's the functor as it is now: struct FileLessNameA : std::binary_function<const File&,const File&,bool> { bool operator() (const File& lhs, const File& rhs) const { std::string path1( lhs.get_name().c_str() ); std::string path2( rhs.get_name().c_str() ); boost::algorithm::to_lower( path1 ); boost::algorithm::to_lower( path2 ); return path1 < path2; } }; Any suggestions for improvements appreciated :) Regards, Matthias -- Matthias Kaeppler

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(no subject)
by Karim Bakir 07 Mar '06

07 Mar '06

Hi , I have a problem, I download boost, I followed the steps on www.boost .org so first I build jam to obtain jam.exe, I copy it in my directorie where I installed boost. I run Msdos, I run VCVARS32 to set the environement of vc++ after I execute : bjam "-sTOOLS=msvc" install It compiles , however I have many errors and failed. At the end , It has copied in a directory boost include... the include , and the . lib. But I don't have all the libs I have the following message: ...failed updating 82 targets... ...skipped 60 targets... ...updated 4598 targets... Can you help me please. Thanks

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String compare (instead of just less) that returns -1, 0 or 1
by Olaf van der Spek 07 Mar '06

07 Mar '06

Hi, Does Boost contain a (string) compare function that returns -1 if a < b, 0 if a == b and 1 if a > b? Doing both < and == sounds like a lot of extra work in for example sorting algorithms.

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Re: [Boost-users] Linking problems with 'scoped_static_mutex_lock'fromregex library?!
by arno.schaefer＠sqs.de 07 Mar '06

07 Mar '06

Thanks for the hint and sorry for that stupid matter. Arno

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[Numeric Conversion] Trivial typos in documentation
by Scott Meyers 07 Mar '06

07 Mar '06

Twice on http://boost.org/libs/numeric/conversion/doc/numeric_cast.html, "Traget" ==> "Target" Scott

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