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[bind][make_shared] compilation failure with ref arg
by Jeff Flinn 25 Jan '10

25 Jan '10

The last statement below fails to compile with boost 1.39.0 on MSVC 8. Am I doing anything obviously wrong? Any help is appreciated. Jeff #include <boost/bind.hpp> #include <boost/smart_ptr/make_shared.hpp> struct X { X(const int* ) {} }; struct Y { Y(int& ) {} }; int _main(int argc, char* argv[]) { int i = 123; boost::bind(&boost::make_shared<int>); boost::bind(&boost::make_shared<int, int>, i); boost::bind(&boost::make_shared<int, int>, 123); boost::bind(&boost::make_shared<X, int*>, &i); boost::bind(&boost::make_shared<Y, int&>, boost::ref(i)); return 0; }

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[interprocess] shared_memory_object constructor with create_only parameter
by Philipp Hamann 25 Jan '10

25 Jan '10

Hi all, I have some problems using the shared_memory_object constructor with the create_only parameter. The goal is to allow only one process to write to the shared memory. So I create a shared_memory_object with the create_only parameter. For the first process this is successful (as I assumed), but for the second process (same parameters) this is successful, too (not as I assumed). The documentation of boost says that it should throw an exception, if the shared memory is allready created. Is this a bug or a misuse or understanding of the library? I am using WinXP, boost 1.41 and MinGW 5.1.6. Probably this is a problem concerning the special handling of the shared memory using Windows? I realized another problem. If I call the static function shared_memory_object::remove(const char* name), the memory should be removed only when no further process has access to the memory. This seems also not to work. I did the following: 1. create shared memory for writing. 2. open shared memory for reading 3. shared_memory_object::remove(const char* name) (from the reading process) 4. reopen the shared memory for reading -> exception: can not find the file Any suggestions to my issues? Thanks in advance Philipp

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[Test] Problem with autolink
by Simon Pickles 25 Jan '10

25 Jan '10

Hello, I have been using boost.test with reasonable success, then all of a sudden I have a link error. Obviously I have changed something aobut my project settings. Perhaps someone could help me identify what I have done. I am using boost 1.41.0 on msvc 9.0. The linker is looking for LINK : fatal error LNK1104: cannot open file 'boost_unit_test_framework-vc90-mt-gd-1_41.lib' This lib is not built by running bjam. I have tried all manner of bjam arguments even: bjam --build-type=complete but I only get boost*.dll and libboost*.lib libraries built. I have tried adding #define BOOST_TEST_DYN_LINK and removing it! All this has no effect on my link error, or the file to which the linker is linking. Thanks for any guidance. Si

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Re: [Boost-users] what is template<typename> struct +; ?
by Tan, Tom (Shanghai) 25 Jan '10

25 Jan '10

>I don't see this in adapt_struct.hpp. Which version of Boost are you >finding this in ? Oops, It's my mistake, it seems I accidently replaced "sequence_tag" with "+" in the editor without noticing it.

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Integrating Boost::Test into a logger
by Charles Solar 25 Jan '10

25 Jan '10

I am wondering if its possible to integrate boost::test into my logging system so I can segregate the log messages into the individual tests. Right now I have the results redirecting to a file, but all I get is 'this succeeded, this failed' and there is no way to go into my apps log file and tie the failed tests to the log messages. I was wondering if there is some mechanism I can write up that will allow me to log the test name at the beginning and end of the test so I end up with output like: LOG_INFO: Starting test 'zero_length_string_test' LOG_ERROR: String is zero length! LOG_WARN: Could not create new string LOG_INFO: End test 'zero_length_string_test' Then when I go to my results I can do a quick search of my apps log to find out why something failed. So is there someway to get a hold of the current test name in a fixture, or is there someway to setup a global fixture that is executed for each test and has this information? Thanks

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what is template<typename> struct +; ?
by Tan, Tom (Shanghai) 25 Jan '10

25 Jan '10

While trying to read \boost\fusion adapt_struct.hpp and understand the internals of BOOST_FUSION_ADAPT_STRUCT. I came across this code: namespace boost { namespace mpl \ { \ template<typename> \ struct +; \ \ //.... }} Can anyone please explain what " template<typename> struct +; " means here? I am puzzled how it ever compiles as an operator is used as a class name. Thanks.

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Specific Time Zone In boost::posix_time::ptime
by Yan Cheng Cheok 25 Jan '10

25 Jan '10

I have the following time : 2010-01-25 03:13:34.384 - GMT Time Zone 2010-01-25 11:13:34.384 - My Local I wish to convert to timestamp in ms. However, since I only obtain local time string from caller "2010-01-25 11:13:34.384" If I do it this way : // ts is "2010-01-25 11:13:34.384" (My Local) boost::posix_time::ptime t(boost::posix_time::time_from_string(ts)); boost::posix_time::ptime end(boost::gregorian::date(1970,1,1)); boost::posix_time::time_duration dur = t - end; // epoch is 1264418014384 // 2010-01-25 11:13:34.384 (GMT) -- But I want 2010-01-25 03:13:34.384 // 2010-01-25 19:13:34.384 (My Local) -- But I want 2010-01-25 11:13:34.384 long long epoch = dur.total_milliseconds(); Is there any way to tell boost::posix_time, that the ts string which it receives, is belong to My Local timezone?

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Re: [Boost-users] binary size:boost::serialization and boost::variant
by Brian Wood 25 Jan '10

25 Jan '10

Robert Ramey writes: > It's not a question of the symbols. with MSVC 7.1 at least, > Release mode optimization collapses all the inline template > instantiations down to code which is no larger than one > would write by hand. This can be verified by adding the > debug symbols to the release mode and disassembling at > the point where serialization is invoked. In MSVC the > debug symbols are a separate file. The "code bloat" > results from that fact that inline template code is not > optimized by the comiler in Debug builds. In the tests I've done on Windows Vista and MSVC++ 10 with -O2, executables built with release version of Boost Serialization are more than two times the size of executables built with Ebenezer Enterprises' approach. On Linux the stripped Boost executables are more than 4 times larger than their Ebenezer counterparts. http://webEbenezer.net/comparison.html Regards, Brian Wood http://www.webEbenezer.net (651) 251-9384 <http://frankrosenbloom.com>

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[multi_array] compiling and changing an example
by sean farrow 25 Jan '10

25 Jan '10

Hi: I'm tryingto use boost::multi_array, I've included boost/multi_array.hpp in the file and have the following code: private: typedef boost::multi_array<double, 3> array_type; typedef array_type::index index; array_type test(boost::extents[3][4][2]); Commenting out the third line compiles fine, but leaving this in gives a c2061 error. It seems there is an issue with boost::extents, which header is this in? I don't have a using boost; earlier, should I have? I'm using visual c+ 2008. Any help apreciated. Sean.

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[asio] Throwing an exception on timeout
by Pascal Kesseli 24 Jan '10

24 Jan '10

Hi folks While reading out a serial interface with boost asio, I used the following timeout protection: const boost::function<void(const error_code &)> SerialInterface::ON_TIMEOUT(if_then(_1 != error::operation_aborted, throw_exception(bind(constructor< SerialInterfaceTimeoutException> ())))); // ... void SerialInterface::read(void *buf, size_t size) throw(SerialInterfaceTimeoutException) { charTimeout.expires_from_now(maxCharDelay); charTimeout.async_wait(ON_TIMEOUT); // ... If a timeout occurs, the exception is thrown as expected. However, it is not handed any further from read, but instead the program terminates with a message concerning the exception. Is there any method having a throw() constraint in this async_wait chain? Thanks for any hint and best regards Pascal _________________________________________________________________ Personalisiere dein Messenger, inklusive persönliche Smileys ;-) Überrasche deine Freunde - wir zeigen dir wie's geht. http://rubrik.ch.msn.com/reportagen/personalisieren.aspx

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