January 2014 - Boost-users - lists.preview.boost.org

boost multiprecision & STL map
by tridiak＠ihug.co.nz 19 Jan '14

19 Jan '14

I have a boost/C++ error which I am having a difficult time figuring out. Compiler error : Call to member function '__construct_node' is ambiguous Where StellarID()==0) {return errInvalidID;} if (stellarObjects.find(obj->StellarID())!= stellarObjects.end()) { return errStellarObjectIDClash; } stellarObjects[obj->StellarID()]=obj;

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[coroutine] Launch a thread in a coroutine
by Pierre Talbot 18 Jan '14

18 Jan '14

Hi, Is it possible to launch a thread in a coroutine? Such that this code would work: #include <iostream> #include <thread> #include <boost/coroutine/all.hpp> std::thread t; void push_data2(boost::coroutines::coroutine<std::string>::push_type sink) { sink("test2"); } void push_data(boost::coroutines::coroutine<std::string>::push_type& sink) { sink("test1"); t = std::thread(push_data2, std::move(sink)); } int main() { boost::coroutines::coroutine<std::string>::pull_type source(push_data); auto b = boost::begin(source); auto e = boost::end(source); std::cout << *b << std::endl; ++b; std::cout << *b << std::endl; t.join() return 0; } Output: test1 parser: /usr/local/include/boost/smart_ptr/intrusive_ptr.hpp:162: T* boost::intrusive_ptr<T>::operator->() const [with T = boost::coroutines::detail::push_coroutine_base<std::basic_string<char> >]: Assertion `px != 0' failed. Aborted (core dumped)

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[chron] time_point convertible?
by Oliver Kowalke 17 Jan '14

17 Jan '14

are the time_point-types of the clock-types from boost.chrono convertible into each other? chrono::system_clock::time_point t = convert_fun( chrono::steady_clock::now() ) etc. ?

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[serialization] test_dll_exported in VS2012
by Stefan Gradinger 17 Jan '14

17 Jan '14

Hi! I am currently trying to run the test_dll_exportet test in Visual Studio 2012, with polymorphic_derived2.cpp in a DLL and test_dll_exportet.cpp in the executable. Compiling and Linking works fine, but when I run the test, I get an "unregistered void cast class polymorhpic_derived2<-polymorhpic_base" error at line 85 of test_dll_exportet.cpp. Running the same test using the library_test tool (library_test --toolset=msvc-11.0) yields no errors. Does anybody have an idea what the cause for this problem might be? -- View this message in context: http://boost.2283326.n4.nabble.com/serialization-test-dll-exported-in-VS201… Sent from the Boost - Users mailing list archive at Nabble.com.

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Re: [Boost-users] [msm] [mpl] wrong number of template arguments (21, should be 20)
by Kamel Zaarouri, Mr 17 Jan '14

17 Jan '14

Hi, I added a new transition to my statemachine that is built around boost::msm and I got this error when compiling. error: wrong number of template arguments (21, should be 20) /boost/mpl/aux_/sequence_wrapper.hpp:154: error: provided for 'template<class T0, class T1, class T2, class T3, class T4, class T5, class T6, class T7, class T8, class T9, class T10, class T11, class T12, class T13, class T14, class T15, class T16, class T17, class T18, class T19> struct boost::mpl::vector' I went to add in the beginning of the header file before any boost includes: #define BOOST_MPL_LIMIT_LIST_SIZE 30 But that didn't fix it. I also tried adding in the makefile.am AM_CFLAGS = \ -DBOOST_MPL_LIMIT_LIST_SIZE=30 \ But that didn't fix it either. And then I hacked boost/mpl/limits/list.hpp and I changed the default value of BOOST_MPL_LIMIT_LIST_SIZE from 20 to 30 and I still have this error. Any idea? Thanks, Kamel

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[enable_if] Problem with conversion operator in VS2012
by dariomt＠gmail.com 17 Jan '14

17 Jan '14

Hi all, I'm trying to follow the example given in http://www.boost.org/doc/libs/1_55_0/libs/utility/enable_if.html#sec:enable… But VS2012 compiler gives: error C4519: default template arguments are only allowed on a class template Is this supposed to work with VS2012? Is there some other way to use enable_if in a conversion operator with VS2012? Thnaks!

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Compress to buffer
by Kenneth Adam Miller 16 Jan '14

16 Jan '14

I have an object for which operator << is defined, myobj. I want to compress into a buffer, and I know that this can be done with boost. I would prefer a buffer that dynamically resizes, but that only allocates new space, preferably treating discontiguous space brought on by new allocations as though the whole buffer was one piece; I don't want to find that it's copying data at all. So vector won't work as a buffer; there's no need for it to be contiguous, just as fast as possible. I've been trying to do this with filtering_istreambuf by pushing a bzip2_compressor (any compression filter will work). So far, it's giving me a lot of trouble. I did find an example where a string was passed to a function, but they went through a process where they first moved the string into an stringstream. I don't want to settle for that extra copy either. What would be nice is to be able to do something like compressor << myobj compressor.buf(); //returns compressed myobj output

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Boost.Heap (i.e fibonacci_heap) handle_type handles are persistent across calls?
by Tassos Souris 16 Jan '14

16 Jan '14

Hello to everyone When i use, say a fib_heap fb1 and fib_heap fb2. I add some data to fb1 using the push method and keep the handles returned from those calls. I do the same with fb2. Then i do some modification to the heaps. Lets say i do fb1.merge(fb2). Can i use the handles i obtained from the push calls on fb2 to update the data that was originally in fb2 and now in fb2?? That is the first time i obtain a handle_type from the push() method, it remains valid until the item is removed from the heap?? I tested the above scenario and seems to work but the documentation doesn't say anything and i would like another opinion. Thanks

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Trying to extract sub library from Boost using BCP
by Colin Burn 16 Jan '14

16 Jan '14

I'm trying to extract "just what I need" from Boost to reduce the checkin footprint. So far I'm doing the following (On Windows): bootstrap.bat b2 tools/bcp md extract dist\bin\bcp boost/thread.hpp boost/shared_ptr.hpp boost/enable_shared_from_this.hpp boost/asio.hpp boost/thread/thread.hpp boost/bind.hpp boost/thread/lock_types.hpp boost/thread/condition_variable.hpp .\extract cd extract ..\b2but this gives me an error: boostcpp.jam: No such file or directory link.jam: No such file or directory Jamroot:137: in modules.load ERROR: rule "boostcpp.set-version" unknown in module "Jamfile<C:\temp\boost_1_55_0\extract>". C:/temp/boost_1_55_0/tools/build/v2/build\project.jam:311: in load-jamfile C:/temp/boost_1_55_0/tools/build/v2/build\project.jam:64: in load C:/temp/boost_1_55_0/tools/build/v2/build\project.jam:145: in project.find C:/temp/boost_1_55_0/tools/build/v2\build-system.jam:535: in load C:\temp\boost_1_55_0\tools\build\v2/kernel\modules.jam:289: in import C:\temp\boost_1_55_0\tools\build\v2/kernel/bootstrap.jam:139: in boost-build C:\temp\boost_1_55_0\boost-build.jam:17: in module scopeWhat am I doing wrong? What is the correct way to compile the extracted sub-library? Thanks Colin

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[Geometry] Calculating the centre of a rectangle
by Sean Farrow 16 Jan '14

16 Jan '14

Hi All, I'm in the process of needing to calculate the centre point of a rectangle, given the top left and bottom right co-ordinates. Before I write this myself, I was wondering whether boost Geometry already has something to do this. Any help appreciated. Cheers Sean.

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