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

Storing path from A*, using operator::new with boost::multi_array
by Sladey 01 Aug '13

01 Aug '13

I'm trying to use dynamic memory allocation for the first time. I want to allocate memory for a 2 dim dynamic array, to store paths from an A* function. I think the array for the job is boost::multi_array. Problem I have is seem to be able to allocate the memory but i can't change or access any of the elements. #include <iostream> #include "boost/multi_array.hpp" typedef boost::multi_array<int, 2> array_type; int main() { array_type *A = new array_type; A->resize( … [View More]

3 2

Boost 1.52 with Cygwin and STLPort 5.2.1
by Akanksh Vashisth 31 Jul '13

31 Jul '13

Hello, I am trying to compile the following source file using gcc on cygwin and stlport: //-------------------------------------- //cygwin_stl.cpp #include <boost/graph/graphviz.hpp> int main() { return 0; } //-------------------------------------- with the following commandline: //-------------------------------------- $ gcc cygwin_stl.cpp -I /cygdrive/y/STLPORT/STLport-5.2.1/stlport/ -I /cygdrive/y/BOOST/boost_1_52_0/ //-------------------------------------- and this is … [View More]

1 0

[FileSystem] detect whether a path has a termi9nating separator
by Sean Farrow 31 Jul '13

31 Jul '13

Hi all, Firstly I apologise for the lameness of the question-or if I'm missing something really obvious but, is there a function in boost filesystem or on the path object to terminate the path with a separator if one doesn't exist? Help/pointers appreciated. Regards Sean.

1 0

compiling with -std=c++0x option
by Norman Lo 31 Jul '13

31 Jul '13

Hello, I am trying to compile a source file that utilizes boost::multi_array. When I try to compile the file with the option -std=c++0x, I get the following error: /apps/boost_1_48/include/boost/multi_array/extent_gen.hpp(62): error: class "boost::detail::multi_array::extent_gen<2UL>" has no suitable copy constructor return extent_gen<NumRanges+1>(*this,range(0,idx)); ^ detected during instantiation of "boost::detail::multi_array::extent_gen<<… [View More]

1 0

Deserializing Boost archives using C#
by Robert Fairlie 30 Jul '13

30 Jul '13

Hi, I'm currently writing a component in C++ which creates a hierarchy of objects, and serializes them using the Boost serialization library. The serialized archive consists of a root "Document" object, which consists of an STL vector of "Pages". Each page consists of an STL vector of other object types, which themselves have sub-objects. The platform is Microsoft Windows. At some time in the future I want to port the component to C#. One option would be to call the Boost library from C# … [View More]

1 0

[Boost.Log] compiling issue of trivial example under boost version 1.5.4
by Steven Sun 30 Jul '13

30 Jul '13

Hi All - I was trying to compile the boost log example code under boost_1_54_0/libs/log/example/trivial/. I basically want to have a simple logger with filter function. So the example code serves the purpose. I got the attached error message while trying to compile. I think my compile command is fine because if I comment out the section of " core::get()->set_filter ( trivial::severity >= trivial::info ); " it compiles and runs fine. Can someone please … [View More]

1 0

[datetime] to/from ISO
by Michael Powell 30 Jul '13

30 Jul '13

Hello, I have a cross platform date/time quirk I want to work out. I am using Boost DateTime Posix to_iso_string and from_iso_string to pass date/time fields over the wire. What I am finding is that C# .NET DateTime and/or Boost DateTime Posix ISO do not agree, at least where ISO format is concerned. So... Is it a Boost issue? Or a .NET issue? I'm not positive, but the ISO format goes something like this: "YYYY-mm-DDTHH:MM:SS" Whereas Boost interpretation of that is something like: "… [View More]

1 1

[Spirit][Math] karma: regression in 1.54 due to argument promotion in math?
by Igor R 30 Jul '13

30 Jul '13

Hello, The following code compiles with 1.53, but fails with 1.54 (FreeBSD 9.1, gcc4.2.1): #include <boost/spirit/include/karma.hpp> #include <string> #include <iterator> int main() { using namespace boost::spirit::karma; std::string result; std::back_insert_iterator sink(result); unsigned short a; generate(sink, auto_, a); } The error is: boost/boost/math/tools/promotion.hpp: In instantiation of 'boost::math::tools::promote_args<long double, float, float, … [View More]

2 2

interprocess file_lock timed_lock not returning false after timeout
by Claudio Bantaloukas 30 Jul '13

30 Jul '13

Hi all! I think there are two issues, one is a documentation issue, the other might be a bug with boost::interprocess file_lock. The documentation issue is that it was not clear to me by reading the documentation on file_lock that it is a RAII-style class. By reading that it has process lifetime, I assumed that once acquired, the lock would be held even after the file_lock object is destroyed. Once I figured this out, I changed the file_lock to a static method variable and ran into the … [View More]following issue. I have two processes that use the following class method that I wrote. They both try to acquire a lock on the same file and the lock must be held until the process exits. When I start the first process, it acquires the lock correctly. When I start up the second process, I would expect the following code to return false after 10 seconds //// static boost::interprocess::file_lock process_flock(processLockFile.string().c_str()); if (!process_flock.timed_lock(wait_until)){ //// However, when I read through the logs, I see that the process reaches the timed_lock call and gets stuck there. Can you please help me diagnose this? I'm attaching the entire method with log lines treated for brevity. Boost version is 1.53, running on Centos 6. Thanks! ------------------------8<-------------- ReturnStatus ProcessLocker::lockViaFile() { L_CONTEXT("ProcessLocker::lockViaFile()"); path lockDirectory(lockFileDirectoryName); if (!exists(lockDirectory)){ L_ERROR("missing lock directory"); return r_error; } if (!is_directory(lockDirectory)){ L_ERROR("lock path is not a directory"); return r_error; } path globalLockFile = lockDirectory / "general-locking.lock"; // make sure file exists boost::filesystem::ofstream globalfile(globalLockFile, std::ios::out); // we do nothing with it... globalfile.close(); std::string filename; // class member, this is the process identifier, and is the same between invocations filename.append(identifier); filename.append(".lock"); path processLockFile = lockDirectory / filename; // make sure file exists boost::filesystem::ofstream processfile(processLockFile, std::ios::out); // we do nothing with it... processfile.close(); try { ptime now(second_clock::local_time()); ptime wait_until = now +seconds(10); L_DEBUG("Waiting for global lock until " << wait_until); boost::interprocess::file_lock global_flock(globalLockFile.string().c_str()); if (!global_flock.timed_lock(wait_until)){ L_ERROR("Cannot create global lock"); return r_error; } try { L_DEBUG("Waiting for process lock until " << wait_until); static boost::interprocess::file_lock process_flock(processLockFile.string().c_str()); if (!process_flock.timed_lock(wait_until)){ global_flock.unlock(); // this point is never reached!? L_ERROR("Cannot create process lock"); return r_error; } global_flock.unlock(); L_DEBUG("Obtained process lock, freeing global lock"); return r_ok; } catch (std::exception& e){ global_flock.unlock(); L_ERROR("Cannot create process lock, freeing global lock"); return r_error; } } catch (std::exception& e){ L_ERROR("Cannot create global lock"); return r_error; } } -- Claudio Bantaloukas [View Less]

1 1

serialization of standard unordered containers
by D. R. Evans 29 Jul '13

29 Jul '13

I have a several classes that currently use old-fashioned ("ordered") containers that would benefit greatly from using the C++11 unordered variants. But in the version of boost I'm currently using (1.49.0) serialization of those containers is not supported. So I have some questions: 1. Is serialization of standard unordered containers supported in version 1.54.0 of the boost libraries? 2a. If so, what was the earliest version of the boost libraries that supported serialization of standard … [View More]

7 15