October 2009 - Boost-users - lists.boost.org

[test] Malloc exceptions when using test framework on 64bit OS X 10.6.1
by Vrai Stacey 23 Nov '09

23 Nov '09

Hi, I've been making my first forays in to using Boost on the new OS X release and have encountered some strange behaviour on 64bit machines. Testing with Boost 1.37.0 and 1.40.0 I've found that everything compiles as expected, but attempting to run any unit tests results in an error of the form: *** No errors detected test_exceptions(92517) malloc: *** error for object 0x3000100200460: pointer being freed was not allocated *** set a breakpoint in malloc_error_break to debug Running the test through gdb gives the following stack trace: Program received signal SIGABRT, Aborted. 0x00007fff83f98ff6 in __kill () (gdb) bt #0 0x00007fff83f98ff6 in __kill () #1 0x00007fff8403a072 in abort () #2 0x00007fff83f51095 in free () #3 0x000000010003668a in boost::unit_test::framework_impl::clear (this=0x1000698a0) at framework.ipp:133 #4 0x0000000100036788 in boost::unit_test::framework_impl::~framework_impl (this=0x1000698a0) at framework.ipp:122 #5 0x00000001000386f2 in __tcf_1 () at framework.ipp:222 #6 0x00007fff83f5d274 in __cxa_finalize () #7 0x00007fff83f5d18c in exit () #8 0x0000000100006e93 in start () at unit_test_parameters.ipp:76 This is using the vanilla GCC build that comes with the operating system (see below), default compile flags and strictly single threaded test applications. Using built-in specs. Target: i686-apple-darwin10 Configured with: /var/tmp/gcc/gcc-5646~6/src/configure --disable-checking --enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ --with-slibdir=/usr/lib --build=i686-apple-darwin10 --with-gxx-include-dir=/include/c++/4.2.1 --program-prefix=i686-apple-darwin10- --host=x86_64-apple-darwin10 --target=i686-apple-darwin10 Thread model: posix gcc version 4.2.1 (Apple Inc. build 5646) Some Googling suggests it might be problem with a missing virtual destructor but irritatingly, none of the threads I've found reach any kind of conclusion. I was hoping the collective genius of the list would be able to inform me whether: 1. This is a known bug; I'm happy to put my debugging hat on and dive in, but not if it's already being investigated by people more qualified to do so. 2. There are any work arounds for the problem. 3. There's no problem at all; I'm being a colossal idiot and have overlooked something obvious. Thanks, vrai.

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[Fusion] Views of Associative Sequences
by James Knight 11 Nov '09

11 Nov '09

I'm trying to find a solution to the following problem. If I have an associative sequence such as a fusion::set and I make a filter view of it, the view is not a model of an associative sequence and does not support the has_key and at_key functions. I can use fusion::as_set on the view to get an associative sequence again, but this doesn't really have the effect I want as it results in a set holding copies of the original data whereas the view referenced the original data. Example below. Would it be possible to create a view which supported the associative sequence interface? Any suggested alternative approaches? Thanks Nate ~~~~~~~~~~~~~~~~~ #include <boost/fusion/include/set.hpp> #include <boost/fusion/include/intrinsic.hpp> #include <boost/fusion/include/filter_view.hpp> #include <string> #include <boost/type_traits/is_arithmetic.hpp> #include <boost/mpl/placeholders.hpp> namespace fusion = boost::fusion; using boost::mpl::_; int main() { typedef fusion::set<int,double,std::string> set_t; set_t s(1,2.0,"hello"); fusion::filter_view<set_t,boost::is_arithmetic<_>> filtered_view(s); fusion::front(filtered_view) = 4; //modifies s fusion::result_of::as_set<fusion::filter_view<set_t,boost::is_arithmetic<_> > >::type filtered_set(filtered_view); fusion::at_key<int>(filtered_set) = 16; // modifies the copied data in filtered_set. }

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at_thread_exit() never getting called
by cowwoc 09 Nov '09

09 Nov '09

Hi, I am registering boost::this_thread::at_thread_exit() against one of my threads. When the main thread exits using "return 0" the at_thread_exit hook never gets invoked. Is this normal? Is there a way to hook the main thread shutting down? Thanks, Gili -- View this message in context: http://www.nabble.com/at_thread_exit%28%29-never-getting-called-tp26053513p… Sent from the Boost - Users mailing list archive at Nabble.com.

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Building Boost on Snow Leopard (with Xcode 3.2 installed)
by Manfred Schwind 07 Nov '09

07 Nov '09

Hi, I'm trying to build boost 1.40 on Mac OS X 10.6 Snow Leopard (with Xcode 3.2 is installed). This is the command I used to use on Mac OS X 10.5 Leopard and Xcode 3.1.x: bjam --prefix=/somepath --layout=versioned toolset=darwin architecture=combined address-model=32_64 link=static install This used to give me great universal binaries (ppc/intel, 32-/64-bit). But since installing Snow Leopard and Xcode 3.2 it does not build anymore. No binaries are created and I get strange compiler errors like this: /usr/include/time.h:77: error: expected constructor, destructor, or type conversion before ‘typedef’ /usr/include/time.h:124: error: ‘clock_t’ does not name a type In file included from /usr/include/c++/4.2.1/cwchar:52, from /usr/include/c++/4.2.1/bits/postypes.h:46, from /usr/include/c++/4.2.1/iosfwd:49, from /usr/include/c++/4.2.1/bits/stl_algobase.h:70, from /usr/include/c++/4.2.1/bits/char_traits.h:46, from /usr/include/c++/4.2.1/string:47, from ./boost/program_options/errors.hpp:12, from ./boost/program_options/options_description.hpp: 12, from libs/program_options/src/ options_description.cpp:10: I _assume_ the problem is gcc 4.2 that was probably installed by Xcode 3.2. I am also not sure if gcc 4.2 even supports PCC code generation. So is there a way to switch to gcc 4.0? Or any other solution for the problem? I tried toolset=gcc-4.0 instead of darwin. This resulted in some binaries, but they are not universal anymore, as far as I can see. Any ideas/hints how to successfully build boost on Snow Leopard? Thank you very much, Mani -- http://mani.de - friendly software iVolume - listen to music freehand LittleSecrets - the encrypted notepad Sahara - sand in your pocket Watchdog - baffle the curious

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[thread] About the virtual in virtual operator()
by Richard Vock 02 Nov '09

02 Nov '09

I don't really know wether this is a Boost.Thread related question or a general c++ related, but since I couldn't decide I will disturb you first ;) Maybe you have the patience to look at this minimalistic framework (I stripped almost all functionality): http://pastebin.com/m7dcc833f This compiles well and running it gives me the expected: # starting # This is A # This is B # shutting down The problem is, that I want to run the kernels as threads. Have (again) a look at the highlighted lines (27-29): If I replace 27 by 28+29 I (expectedly) get a compile error since Kernel is abstract. However if I make it non-abstract by implementing the operator() in it, it is this function (namely Kernel::operator()) which get's called instead of TestKernel::operator(). Note that Program will not be able to know about the concrete child classes of Kernel so it cannot dynamic_cast<ConcretKernel*> the pointers and I don't want to use maschine-specific ways like __decltype. I imagine this is merely the old non-static member function pointer problem, however I tried dozens of ways to get around this and the only thing that worked was to add a ConcreteKernel::run() { thread t(*this); t.join(); } to *each* single child class of Kernel which gets rather un- managable with 50 and more descendants. I hope that made sense and that I didn't fail that hard, Richard Vock

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[Spirit] xml parse tree printing double leaf node
by HT4N - 02 Nov '09

02 Nov '09

When I generating parse tree and dump it using the built-in tree-to-xml function, even from a simple grammar, I wonder why it prints out the leaf node twice. For instance: Parameter = ParameterName >> ParameterValue; The tree it prints it looks more or less like the following (note the repetition of ParameterName and ParameterValue nodes): <Parameter> <ParameterName> <ParameterName> <value>Foo</value> </ParameterName> </ParameterName> </ParameterValue> <ParameterValue> <value>Bar</value> </ParameterValue> </ParameterValue> </Parameter> I would be expecting more something like: <Parameter> <ParameterName> <value>Foo</value> </ParameterName> </ParameterValue> <value>Bar</value> </ParameterValue> </Parameter> Is there any directive or secret that I don't know ? Thanks HT _________________________________________________________________ Windows 7: I wanted more reliable, now it's more reliable. Wow! http://microsoft.com/windows/windows-7/default-ga.aspx?h=myidea?ocid=PID247…

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Boost Functionality question: Explicit dynamic library loading
by Sarbak, Joseph 01 Nov '09

01 Nov '09

Hello, I'm curious to know whether boost has support for explicitly loading shared libraries in a cross-platform fashion. I have done my own search of the 1.40.0 boost code base and could not find any abstraction around dlopen,dlsym,dlclose and their equivalents on windows. While it would be easy for me to write wrappers around this functionality, I would prefer to use something in boost if already available. Thank you and regards, Joe Sarbak ________________________________________ This E-Mail (including any attachments) may contain privileged or confidential information. It is intended only for the addressee(s) indicated above. The sender does not waive any of its rights, privileges or other protections respecting this information. Any distribution, copying or other use of this E-Mail or the information it contains, by other than an intended recipient, is not sanctioned and is prohibited. If you received this E-Mail in error, please delete it and advise the sender (by return E-Mail or otherwise) immediately. This E-Mail (including any attachments) has been scanned for viruses. It is believed to be free of any virus or other defect that might affect any computer system into which it is received and opened. However, it is the responsibility of the recipient to ensure that it is virus free. The sender accepts no responsibility for any loss or damage arising in any way from its use. E-Mail received by or sent from RBC Capital Markets is subject to review by Supervisory personnel. Such communications are retained and may be produced to regulatory authorities or others with legal rights to the information. IRS CIRCULAR 230 NOTICE: TO COMPLY WITH U.S. TREASURY REGULATIONS, WE ADVISE YOU THAT ANY U.S. FEDERAL TAX ADVISE INCLUDED IN THIS COMMUNICATION IS NOT INTENDED OR WRITTEN TO BE USED, AND CANNOT BE USED, TO AVOID ANY U.S. FEDERAL TAX PENALTIES OR TO PROMOTE, MARKET, OR RECOMMEND TO ANOTHER PARTY ANY TRANSACTION OR MATTER.

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[regex] Using Boost.Regex rather than std::regex with VC++
by Ahmed Charles 01 Nov '09

01 Nov '09

I'm using VC2010, which provides an implementation of std::regex/std::tr1::regex and boost gladly uses this implementation rather than it's own. I'd like to turn this off, so that I get the boost version when including: #include <boost/regex.hpp> Thanks in advance.

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bad_any_cast being thrown but no idea why
by John Yamokoski 01 Nov '09

01 Nov '09

I have been pulling my hair out over this bug for a day or two now. Here's the synopsis. I have a boost::any object which is storing a std::string. Any test I do to check if indeed the any object is holding onto a std::string object verifies what I already know. For instance, the following function always returns true for my boost::any object: bool is_string(const boost::any& operand) { return ( operand.type() == typeid(std::string) ); } Also if I just print out the typeinfo information for the boost::any object is also shows that its holding onto a std::string: std::stringstream ss; ss << "any object: " << obj.type().name() << ", a string: " << typeid(std::string).name(); yields, any object: Ss, a string: Ss However, whenever I try and actually cast my object to a string (boost::any_cast<std::string>(...)), I always get "boost::bad_any_cast: failed conversion using boost::any_cast". Could this possibly be a compiler issue? I saw one other thread where "-fvisibility=hidden" was causing some problems for boost::program_options and std::string. In my situation, I have a library which is responsible for creating those boost::any objects. Then its in a separately compiled library where I am getting the problems.

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[Random] uniform_01
by Robert Patterson 01 Nov '09

01 Nov '09

Hi, I was looking at the docs for the uniform_01 distribution: http://www.boost.org/doc/libs/1_39_0/libs/random/random-distributions.html#… I read the following note "Note: The current implementation is buggy, because it may not fill all of the mantissa with random bits." I do not understand the problem. I looked at the code, which does what I expect. Why is it a problem if some of the mantissa bits are not 'random'? As I understand the requirement is the real numbers are uniformly distributed; the bit patterns should not matter provided they represent numbers with the right mathematical properties. Thanks Robert Patterson http://como.cheng.cam.ac.uk/index.php?Page=People&Section=riap2

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