September 2019 - Boost-users - lists.preview.boost.org

[interprocess] Determine size of managed_shared_memory
by Kai Benndorf 12 Oct '19

12 Oct '19

Hi all, I want to create a managed_shared_memory in exactly the size I needed. Therefore I do something like this: size = sizeof( common_managed_shared_memory ); size += sizeof( MyClassInSharedMem ); managed_shared_memory segment(create_only, "name", size ); MyClassInSharedMem allocates itself some memory by segment->allocate(). I added this also to the size, but get a boost::interprocess::bad_alloc exception on allocating this additional memory. Are there some magic bytes I forgot to add? Many thanks in advance Kai

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Assigning to a boost::asio::ssl::context while asynchronous operations are using it
by Martijn Otto 30 Sep '19

30 Sep '19

I cannot find any definitive documentation on whether it's safe to move-assign to an ssl-context while it is used for asynchronous operations, assuming of course the application is single-threaded. In my tests I could not trigger any failures, but that may be pure luck (or not lucky at all depending on point of view).

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catmull_rom returning a single point
by hgrwilson 30 Sep '19

30 Sep '19

Hi all, I am trying to interpolate some data with a *catmull_rom* spline available in boost math (interpolation). However, the resulting spline collapses to a single point for all /s/, corresponding to the first control point, /points_intr[0]/. Below, the c++ code segment of the interpolation is depicted: std::vector<std::array<double, 2>> points_intr(16); points_intr[0] = { 1.263270, 0.774614 }; points_intr[1] = { 1.876, 2.480 }; points_intr[2] = { 1.651110, 4.550 }; points_intr[3] = { 1.426340, 5.688 }; points_intr[4] = { 1.429, 7.054 }; points_intr[5] = { 2.073220, 8.377020 }; points_intr[6] = { 3.910, 9.140 }; points_intr[7] = { 6.430, 9.537 }; points_intr[8] = { 8.950, 9.859 }; points_intr[9] = { 11.470, 10.317 }; points_intr[10] = { 12.730, 10.6456 }; points_intr[11] = { 13.990, 11.0741 }; points_intr[12] = { 15.335, 11.6928 }; points_intr[13] = { 16.680, 12.5661 }; points_intr[14] = { 18.3538, 14.830 }; points_intr[15] = { 18.700, 16.056 }; boost::math::catmull_rom<std::array<double, 2>> interpolator_cr(std::move(points_intr)); auto max_s = interpolator_cr.max_parameter(); std::array<double, 2> inter_points; for (int i = 0; i < 100; i++) { inter_points = interpolator_cr(max_s * (i / num_points)); geometry_msgs::Point p; p.x = inter_points[0]; p.y = inter_points[1]; p.z = z; //p.z = inter_points[2]; marker.points.push_back(p); DEBUG_INFO("spline %d: (x, y) %f, %f, current_s: %f", i, p.x, p.y, max_s * (i / 100.0)); } I'm using boost 1.71.0 -- Sent from: http://boost.2283326.n4.nabble.com/Boost-Users-f2553780.html

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[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> ^ compilation terminated. This is an error in the ptree.hpp imported file. Maybe this has a quick fix but I'm kinda new to C++. I've checked and both files exist (boost/property_tree/ptree and boost/property_tree/ptree_fwd.hpp). Thanks, Rui

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