May 2009 - Boost - lists.boost.org

Package build problem
by Scott Karns 21 May '09

21 May '09

When I attempt to create a boost-1.39.0 RPM, I encounter the following error: + bjam -j2 -d2 --layout=tagged --toolset=gcc variant=release threading=single,multi optimization=speed 'linkflags= -Wl,--as-needed -Wl,--no-undefined -lpython2.5' debug-symbols=on -sHAVE_ICU=1 --prefix=/usr --libdir=/usr/lib nBuilding C++ Boost. After the build, the headers will be located at /home/scott/RPM/BUILD/boost_1_39_0 The libraries will be located at /home/scott/RPM/BUILD/boost_1_39_0/stage/lib Use 'bjam install --prefix=<path>' if you wish to install headers and libraries to a different location and remove the source tree.nn warning: Graph library does not contain optional GraphML reader. note: to enable GraphML support, set EXPAT_INCLUDE and EXPAT_LIBPATH to the note: directories containing the Expat headers and libraries, respectively. warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. Note: Building Boost.Regex with Unicode/ICU support enabled Using ICU in /home/scott/RPM/BUILD/boost_1_39_0/tools/build/v2/build/virtual-target.jam:1056: in virtual-target.register-actual-name from module virtual-target error: Duplicate name of actual target: <pstage/lib>libboost_date_time.so.1.39.0 error: previous virtual target { common%common.copy-libboost_date_time.so.1.39.0.SHARED_LIB { gcc%gcc.link.dll-libboost_date_time.so.1.39.0.SHARED_LIB { gcc%gcc.compile.c++-gregorian/greg_month.o.OBJ { gregorian/greg_month.cpp.CPP } } { gcc%gcc.compile.c++-gregorian/greg_weekday.o.OBJ {gregorian/greg_weekday.cpp.CPP } } { gcc%gcc.compile.c++-gregorian/date_generators.o.OBJ { gregorian/date_generators.cpp.CPP } } } } I have changed the original --layout= option in the specfile from --layout=system to --layout=tagged per Vladimir's suggestion here http://lists.boost.org/Archives/boost/2009/05/151541.php. Anyone have a suggestion? -- Scott

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[property_tree] Files with tab and min/max issues
by Jeremiah Willcock 21 May '09

21 May '09

(reposting this because it was part of a previous thread that property_tree maintainers may not have been following) Is libs/property_tree/detail/pugxml.hpp third-party code? It has several min/max and tab issues, but I did not fix them because it appeared to be outside code that we should not change. Should I fix the issues anyway? Also, the following two files had tabs within test input strings. I do not know if they were intentional. If so, I should probably change them to \t, and if not, they should become spaces. What do you want me to do with them? libs/property_tree/test/test_json_parser.cpp libs/property_tree/test/xml_parser_test_data.hpp -- Jeremiah Willcock

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[Math/Statistical Distributions] Rethinking of distribution template parameters.
by Marco Guazzone 21 May '09

21 May '09

Dear Boost developers, This is a feature request for the next version of Math/Statisical Distributions lib. Currently, due to lack of input type information, discrete distributions can only be "emulated" by using the discrete_quantile policy. However, doing so the effective quantile type is still a real type. In my opinion, this have at least two disadvantages: 1. Operations are slow since the underlying quantile type is still real. Instead, operations on really integral types are generally faster. 2. Quantile comparison might be inaccurate since we are comparing real types So, for improving the support of discrete distributions, I think it would be nice if the all probability distributions gain a third template parameter, named, for instance, InputType. This can be used as follows: For discrete distributions, like the "discrete uniform distribution": --- [discrete_snip] --- template < typename InputType = int, typename ValueType = double, typename Policy = policies::policy<> > class discrete_uniform_distribution { public: typedef InputType input_type; typedef ValueType value_type; typedef Policy policy_type; discrete_uniform_distribution(input_type lower = 0, input_type upper = 9) : lower_(lower), upper_(upper) { // Empty } inline input_type lower() const { return lower_; } inline input_type upper() const { return upper_; } private: input_type lower_; input_type upper_; }; --- [/discrete_snip] --- For continuos distributions, like the "continuous uniform distribution": --- [continuous_snip] --- template < typename InputType = double, typename ValueType = InputType, typename Policy = policies::policy<> > class continuous_uniform_distribution { public: typedef InputType input_type; typedef ValueType value_type; typedef Policy policy_type; continuous_uniform_distribution(input_type lower = 0, input_type upper = 9) : lower_(lower), upper_(upper) { // Empty } inline input_type lower() const { return lower_; } inline input_type upper() const { return upper_; } private: input_type lower_; input_type upper_; }; --- [/continuous_snip] --- NOTE: as you know, discrete and uniform distributions behave differently. So two different class (or two different instantiations of the same templated class) must be provided. What do you think? Thank you for your attention!! -- Marco

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[asio] Regarding ssl session reuse
by s samba 21 May '09

21 May '09

Hi All, I am new to this group. We are trying to use asio in our project. We don't see any ssl session cache in ssl stream. Is there any plan to add this? Shall I volunteer to work on this feature? -- Thanks Sambasiva S

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Volunteering to fix tab and min/max issues
by Jeremiah Willcock 21 May '09

21 May '09

Since tabs in source files and min/max guideline violations are so easy to correct, is it OK if I just fix them in all libraries (except for the inspection tool's examples)? I will not do any that appear to be intentional or that would change the meaning of the code. Do I have permission to do that and just commit the changes? -- Jeremiah Willcock

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how to build boost with bzip2 in non-standard location?
by Oliver Kullmann 21 May '09

21 May '09

Hello, I want to build the full boost library, while I don't have bzip2 installed system-wide (but I just downloaded and installed it locally). It seems to me that http://www.boost.org/boost-build2/doc/html/bbv2/tasks/libraries.html should be relevant here for that task, but I find the descriptions too general to understand. I wonder whether somebody could simply tell me the lines to be entered into the bjam-configuration file? Perhaps bz2 : : <file> Path_to_libbz2.a ; But how to specify where to find bzlib.h ? Isn't it possible to specify the base directory, where then, as, usual include, lib and bin are found? Thanks in any case! Oliver

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bootstrap.sh bug in 1.39.0
by Chris Saunders 20 May '09

20 May '09

There is a typo in the lib install directories in bootstrap.sh: $ diff bootstrap.sh bootstrap.sh.fixed 252c252 < LIBDIR="$EXPREFIX/lib" --- > LIBDIR="$EPREFIX/lib" 390c390 < EOF \ No newline at end of file --- > EOF ps. I wouldn't have minded checking what's on the head of svn first and reporting this throught the regular bug channels, but my browser won't let me past these certificate errors: """ Secure Connection Failed svn.boost.org uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. (Error code: sec_error_unknown_issuer) . . . etc """

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Question for C++ experts about exception allocation failure
by Emil Dotchevski 20 May '09

20 May '09

How is failure to allocate an exception object handled in various compilers? 15.1.4 says that "the memory for the temporary copy of the exception being thrown is allocated in an unspecified way" but I don't think it specifies behavior for the case when the allocation fails. I know that some compilers allocate exceptions from the heap, so does this mean that an attempt to throw any exception could, in theory, result in a std::bad_alloc being thrown instead? As far as I can tell such behavior wouldn't violate the C++ standard, but I'm not sure my interpretation is correct. Anyone? Emil Dotchevski Reverge Studios, Inc. http://www.revergestudios.com/reblog/index.php?n=ReCode

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[MPL] Is there an "include all" header?
by Adam Badura 20 May '09

20 May '09

I am looking for a "include all" header for Boost.MPL. Is there such? For the Boost.Preprocessor (having similar structure) there is <boost/preprocessor.hpp> however <boost/mpl.hpp> does not exist. Is it by purpose or just a forgotten feature? Actually I think having such "include all" headers is very convenient especially for larger libraries. (Yes, I know I can write such header by myself and then just use it every time I want to use Boost.MPL however having a "standard one" would be easier I think.) Adam Badura

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Volunteering to be a Review Manager
by Stewart, Robert 20 May '09

20 May '09

One thing that http://www.boost.org/community/reviews.html#Review_Manager doesn't mention is how a prospective review manager should volunteer. Presumably, one just sends a message to the developer's list to that effect, but I'd think a prescribed subject line would increase the likelihood that the review wizard sees it. _____ Rob Stewart robert.stewart(a)sig.com Software Engineer, Core Software using std::disclaimer; Susquehanna International Group, LLP http://www.sig.com IMPORTANT: The information contained in this email and/or its attachments is confidential. If you are not the intended recipient, please notify the sender immediately by reply and immediately delete this message and all its attachments. Any review, use, reproduction, disclosure or dissemination of this message or any attachment by an unintended recipient is strictly prohibited. Neither this message nor any attachment is intended as or should be construed as an offer, solicitation or recommendation to buy or sell any security or other financial instrument. Neither the sender, his or her employer nor any of their respective affiliates makes any warranties as to the completeness or accuracy of any of the information contained herein or that this message or any of its attachments is free of viruses.

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