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

[Log] using std::shared_ptr and other std primatives rather than the boost counterparts
by Sean Farrow 30 Sep '19

30 Sep '19

Hi, Is is possible ot use std::shared_ptr and other std primatives with boost.log rather than the boost counterparts. I'm converting a codebase from boost namespaces and would like to add logging. Thanks, Sean.

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Re: [Boost-users] <boost/timer/timer.hpp> deprecated ?
by Kenneth Porter 23 Sep '19

23 Sep '19

--On Friday, September 13, 2019 3:35 PM +0100 "avib369 . via Boost-users" <boost-users(a)lists.boost.org> wrote: > How do I get rid of this message ? You could do what it says to do?

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Community blog or tutorial posting for C++
by Matt Zand 22 Sep '19

22 Sep '19

Hi, Does anyone know if there is a way for members to post blogs or tutorials on C++ in the Boost community or website? -- Cheers, Matt Zand Cell: 202-420-9192 Work: 240-200-6131 High School Technology Services <https://myhsts.org/> DC Web Makers <https://dcwebmakers.com/> Coding Bootcamps <https://coding-bootcamps.com/>

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<boost/timer/timer.hpp> deprecated ?
by avib369 . 13 Sep '19

13 Sep '19

How do I get rid of this message ? /tmp/ma0/boost/gcc-7.3/boost_1_71_0/boost/timer.hpp:21:70: note: #pragma message: This header is deprecated. Use the facilities in <boost/timer/timer.hpp> instead. BOOST_HEADER_DEPRECATED( "the facilities in <boost/timer/timer.hpp>" ) Ta, Avi

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boost.asio: win_iocp_serial_port_service::open changes broke FTDI support
by Michael Steinberg 12 Sep '19

12 Sep '19

Hello, the changes to win_iocp_serial_port_service::open in commit c113adc19004770d945672009b3d26f9498099cd broke at least FTDI 4232H but probably all FTDI support for me. SetCommState(handle, &dcb) in new line 99 fails with error code 57. Reverting the commit seems to recover correct behaviour. Kind Regards Michael

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Building Boost with C++17 standard
by Osman Zakir 12 Sep '19

12 Sep '19

Okay, so how do I build Boost under the C++17 standard? There's something I need to do in the configuration file, right?

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Compile error using property_tree
by Rui Pedro 11 Sep '19

11 Sep '19

Hello guys, I wanted to use boost to parse an INI file. in my code i used this includes: #include "boost/property_tree/ptree.hpp" #include "boost/property_tree/ini_parser.hpp" when I compile my code "g++ test.cpp -o Test" with only this two includes I get an error from one of the included files: In file included from test.cpp:15:0: boost/property_tree/ptree.hpp:15:45: fatal error: boost/property_tree/ptree_fwd.hpp: File or directory not found #include <boost/property_tree/ptree_fwd.hpp… [View More]

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[asio] using fork in coroutine composed operations
by Stephan Menzel 11 Sep '19

11 Sep '19

Hello all, my experiments with custom composed operations in asio have led me to another question regarding the use of such methods. What do I do in order to have multiple handlers in flight, e.g. for a timer? My example is here: https://github.com/MrMoose/moose_tools/blob/master/TimedConnect.hpp I'm trying to realize an old dream in asio. A function that will take a socket and asynchronously do a resolve and connect to the result while having a timeout around the operation. Here in the … [View More]

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Program Options MacOS Error
by Michael Chiu 10 Sep '19

10 Sep '19

Hi All, I was trying to use boost program options to capture a std::string like the examples in the documentation. However I keep getting the error: libc++abi.dylib: terminating with uncaught exception of type boost::wrapexcept<boost::bad_any_cast> when i try to retrieve the value from the valuemap, i.e. vm["source"].as<std::string>(); The code that I have (which right now is essentially the tutorial example) runs fine on linux but has the above error on macos. Am i doing … [View More]

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Re: [Boost-users] xlcpp: use of undeclared identifier 'decltype' used in boost/thread/lockable_traits.hpp
by Roy Musselman 10 Sep '19

10 Sep '19

Greetings, While attempting to build boost 1.70.0 for IBM Power9 using the IBM XL compilers using the SPACK tool, the following errors occur repeatedly for every header file that eventually includes boost/thread/lockable_traits.hpp In file included from ./boost/thread/lock_types.hpp:14: ./boost/thread/lockable_traits.hpp:157:11: error: use of undeclared identifier 'decltype' decltype(void(boost::declval<T&>().lock())) ^ ./boost/thread/… [View More]

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[asio] writing composed operations example
by Stephan Menzel 03 Sep '19

03 Sep '19

Hi everyone, as a long time asio user I often had needs to wrap up repeating patterns of async calls for re-use. Normally I went for some kind of specialized object that wraps smaller pieces but I recently came across a series of examples which try to explain how own composed operations may be created. https://www.boost.org/doc/libs/1_71_0/doc/html/boost_asio/examples/cpp11_ex… Now, looking at the examples they are of course way over my head but since own composed operations would be very … [View More]

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[MSM] Substatemachine with constructor arguments
by jcbastosportela＠gmail.com 30 Aug '19

30 Aug '19

Hi all, My question regards boost's Meta State Machine (MSM) usage. In my current design of a state machine it would be desirable to pass arguments to the substate machine; this would be done at time of creation of "main state machine". I found something on the documentation close to what I am looking for, however not exactly. State machine constructor with arguments <https://www.boost.org/doc/libs/1_71_0/libs/msm/doc/HTML/ch03s05.html#d0e2502> . This works very well for states, but … [View More]

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Re: [Boost-users] Template specialization for Boost.Polygon
by Bjorn Reese 28 Aug '19

28 Aug '19

On 8/26/19 5:39 PM, Phil Endecott via Boost-users wrote: > Can anyone suggest how I can write my specialisations so that they > are unambiguous? By adding another level of indirection. Create your own trait template. Let both the generalization and your specialization redirect to polygon_traits. Something like this (warning untested code ahead) template <typename T, typename Enable = void> struct my_polygon_traits : public polygon_traits<T, Enable> { }; template <… [View More]

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Template specialization for Boost.Polygon
by Phil Endecott 26 Aug '19

26 Aug '19

Dear Experts, This is a question about Boost.Polygon but please keep reading even if you've never used that library as it's really just about how to resolve ambiguous template specialisations. Boost.Polygon has a mechanism by which you can tell it about your own types by specialising templates. I want to tell it that std::array<Point,N> is a polygon, which I try to do like this: template <size_t N> struct geometry_concept< std::array<Point,N> > { using … [View More]type = polygon_concept; }; template <size_t N> struct polygon_traits< std::array<Point,N> > { ....... }; This doesn't work because of ambiguity between that specialisation of polygon_traits and a default specialization that is in the library itself; the library code looks something like this: template <typename T, typename enable = gtl_yes> struct polygon_traits {}; template <typename T> struct polygon_traits<T, ...some SFINAE stuff.... > { ......... }; If I try to just specialize one size of array it works: template <> struct polygon_traits< std::array<g2i::Point,3> > { ....... }; The error is: test_template_specialization.cc:64:19: error: ambiguous partial specializations of 'polygon_traits<std::__1::array<Point, 3>, boost::polygon::gtl_yes>' boost::polygon::polygon_traits<std::array<Point,3>>::iterator_type i = nullptr; ^ /usr/local/include/boost/polygon/polygon_traits.hpp:100:10: note: partial specialization matches [with T = std::__1::array<Point, 3>] struct polygon_traits<T, ^ test_template_specialization.cc:32:8: note: partial specialization matches [with N = 3] struct polygon_traits< std::array<Point,N> > ^ I have the same issue when I attempt to use a Point class that takes the coordinate type as a template parameter. Can anyone suggest how I can write my specialisations so that they are unambiguous? A complete test program follows. I'm testing with Boost 1.69.0, but I don't think anything has changed in Polygon since then. Thanks, Phil. #include <boost/polygon/polygon.hpp> #include <array> struct Point { int x; int y; }; namespace boost { namespace polygon { template <> struct geometry_concept<Point> { using type = point_concept; }; template <> struct point_traits<Point> { using coordinate_type = int; static inline coordinate_type get(const Point& point, orientation_2d orient) { return (orient==HORIZONTAL) ? point.x : point.y; } }; template <size_t N> struct geometry_concept< std::array<Point,N> > { using type = polygon_concept; }; template <size_t N> struct polygon_traits< std::array<Point,N> > { using coordinate_type = int; using iterator_type = typename std::array<Point,N>::const_iterator; using point_type = Point; static inline iterator_type begin_points(const std::array<Point,N>& p) { return p.begin(); } static inline iterator_type end_points(const std::array<Point,N>& p) { return p.end(); } static inline std::size_t size(const std::array<Point,N>&) { return N; } static inline winding_direction winding(const std::array<Point,N>&) { return unknown_winding; // Hmm. } }; }; }; // namespace boost, polygon int main() { boost::polygon::polygon_traits<std::array<Point,3>>::iterator_type i = nullptr; return 0; } [View Less]

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Help building one module with cross-compiler
by Adrian C 25 Aug '19

25 Aug '19

Hi, I am trying to build boost module "log" on a raspberry PI as a dependency to another project. The RPI runs out of virtual memory during the build process, although I do limit building to just log (I think it builds some dependencies though). So I decided to cross compile it on a x86 machine with plenty of resources. I followed the instructions and built using: BUILD_CXXFLAGS="-std=gnu++11 -pthread" BUILD_CXX=arm-linux-gnueabihf-gcc ./bootstrap.sh --with-libraries=log --with-toolset=cross-… [View More]

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License Issue with boost_intrusive
by Gerald Wiltse 23 Aug '19

23 Aug '19

During an annual third-party audit of our source code, boost intrusive was flagged as containing unlicensed code. Specifically, there are several pieces of code in this file which are explicitly attributed to external parties on external websites, which still exist and show no license. https://github.com/boostorg/intrusive/blob/develop/include/boost/intrusive/… https://github.com/boostorg/intrusive/blob/develop/include/boost/intrusive/… Original sources: http://stackoverflow.com/… [View More]

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[release] Boost 1.71.0
by Michael Caisse 21 Aug '19

21 Aug '19

Release 1.71.0 of the Boost C++ Libraries is now available. These open-source libraries work well with the C++ Standard Library, and are usable across a broad spectrum of applications. The Boost license encourages both commercial and non-commercial use. This release contains 1 new library (Variant2) and numerous enhancements and bug fixes for existing libraries. For details, including download links, see <http://www.boost.org/users/news/version_1.71.0> You can also download directly … [View More]

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[Dll] e0077 with BOOST_DLL_ALIAS
by Sean Farrow 20 Aug '19

20 Aug '19

Hi, I'm getting the following error when using BOOST_DLL_ALIAS to export a function to create a plugin using visual studio 2019 and boost 1.71. This isn't new, just the first time I've noticed it. E0077 this declaration has no storage class or type specifier I've cross-checked this with the example (specifically tutorial 2) to ensure that it wasn't just me. For reference, the offending line in the my_plugin_aggregator.cpp file is: BOOST_DLL_ALIAS( my_namespace::my_plugin_aggregator::… [View More]

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[Dll] Inconsistent annotations reported under visual studio 2019
by Sean Farrow 20 Aug '19

20 Aug '19

Hi all, Whilst compiling a plugin in release mode with boost.dll 1.70 using Visual Studio 2019 and the latest Windows sdk, I'm getting several inconsistent annotation errors for functions like LoadLibraryA/W. Before I go to the trouble of creating a reproducible project and filing an issue, I wondered whether this is something that is know about and possibly fixed in 1.71 Any help appreciated. Kind regards Sean.

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Re: [Boost-users] [release] Boost 1.71.0 Release Candidate 2 available
by Michael Caisse 16 Aug '19

16 Aug '19

On 8/16/19 10:22, William Jagels wrote: > > > On Wed, Aug 14, 2019, 13:29 Michael Caisse via Boost-users > <boost-users(a)lists.boost.org <mailto:boost-users@lists.boost.org>> wrote: > > The release candidates for the 1.71.0 release are now available at: > <https://dl.bintray.com/boostorg/release/1.71.0/source/> > > The SHA256 checksums are as follows: > > 1b3949ffddf56129141032542523920034f2e69775fb9332a52ba37c548dbf35 … [View More]

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[release] Boost 1.71.0 Release Candidate 2 available
by Michael Caisse 15 Aug '19

15 Aug '19

The release candidates for the 1.71.0 release are now available at: <https://dl.bintray.com/boostorg/release/1.71.0/source/> The SHA256 checksums are as follows: 1b3949ffddf56129141032542523920034f2e69775fb9332a52ba37c548dbf35 boost_1_71_0_rc2.7z d73a8da01e8bf8c7eda40b4c84915071a8c8a0df4a6734537ddde4a8580524ee boost_1_71_0_rc2.tar.bz2 96b34f7468f26a141f6020efb813f1a2f3dfb9797ecf76a7d7cbd843cc95f5bd boost_1_71_0_rc2.tar.gz … [View More]

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Parallel Boost logging with multiple link units
by Simon Michalke 14 Aug '19

14 Aug '19

Hello all, I want to use boost logging with multiple link units. However all of the examples use only one source file (and only have some logging in the main function). In addition to that I need to have multithreading support as well. Do I have to initialize the sink for every module or only once for my program? Regards, Simon Michalke

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Boost ASIO HTTP Server example design question
by TomJordan 12 Aug '19

12 Aug '19

Hi, I'm just starting to use ASIO. I have been reading the C++11 HTTP Server example at https://www.boost.org/doc/libs/1_70_0/doc/html/boost_asio/example/cpp11/htt… and want to make sure I understand use of shared_ptr in this example, because I didn't notice any explanation in the documentation. The connection class inherits from std::enable_shared_from_this<connection>, and is then passed in a shared_ptr (the captured 'self') to the handler function registered with the async_read_some … [View More]

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Interest in updated, standalone iterator_facade library?
by Zach Laine 11 Aug '19

11 Aug '19

I write a lot of iterators, and I'm getting sick of doing it by hand. I can't use Boost.Iterator's iterator_facade in library code, since it knows nothing about constexpr and noexcept. The design of Boost.Iterator's iterator_facade does not lend itself very well to being modified in a direction that is standardization-friendly (reasons why are outlined in the online docs). So, here is one take on this problem: GitHub: https://github.com/tzlaine/iterator_facade Online Docs: https://tzlaine.… [View More]

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[rational] make rational constructors noexcept
by Frédéric 06 Aug '19

06 Aug '19

Hi, I think that some rational constructors can be marked noexcept. In particular: - default constructor: rational() - constructor from integer: rational(const T& n, typename enable_if_c<...>::type const* = 0) Concerning the constructor with numerator and denominator, if the denominator is always not null, it could be noexcept but I guess we cannot enforce not null unless we use some kind of gsl::not_null. Your thoughts? Thanks, F

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