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[Release 1.70] Master branch is now closed for the beta
by Marshall Clow 07 Mar '19

07 Mar '19

Except with explicit permission by a release manager. Do whatever you want on develop, just don't change master. We'll re-open master after the beta. As always, check the calendar at https://www.boost.org/development 6-Mar: Boost 1.70.0 closed for all changes 13-Mar: Boost 1.70.0 beta; master branch re-opened 2-Aug: Release closed for all changes, except by permission of a release manager. 3-Apr: Boost 1.70.0 closed for all changes 10-Apr: Boost 1.70.0 release -- The release managers

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Using domain-based SSL certificate with Boost.Beast
by Osman Zakir 05 Mar '19

05 Mar '19

I looked at this example server certificate in the Boost.Beast repository: https://github.com/boostorg/beast/blob/develop/example/common/server_certif… . I have a free SSL certificate that I got for my Dynamic DNS subdomain name which doesn't have DH parameters but does have a certificate chain and a private key. I don't know what to put for ctx.set_options or ctx.set_password_callback. I tried asking at Let's Encrypt as well: https://community.letsencrypt.org/t/how-to-secure-dynamic-dns/87816/19 . I decided to ask here because they said they can't advise me on how to do it with Boost. I don't want to try a reverse proxy. My current web server code can be found here: https://github.com/DragonOsman/currency_converter/blob/master/currency_conv… . [https://avatars0.githubusercontent.com/u/18173932?s=400&v=4]<https://github.com/DragonOsman/currency_converter/blob/master/currency_conv…> currency_converter/currency_converter.cpp at master · DragonOsman/currency_converter · GitHub<https://github.com/DragonOsman/currency_converter/blob/master/currency_conv…> Application for Computer Science course. Contribute to DragonOsman/currency_converter development by creating an account on GitHub. github.com [https://discourse-cdn-sjc1.com/letsencrypt/uploads/default/original/3X/c/a/…]<https://community.letsencrypt.org/t/how-to-secure-dynamic-dns/87816/19> How to secure Dynamic DNS - Help - Let's Encrypt Community Support<https://community.letsencrypt.org/t/how-to-secure-dynamic-dns/87816/19> The acme.sh certs are generally in a domain folder where the acme.sh script lives (something like ~/.acme.sh/example.com). You don’t likely need to generate a new one. community.letsencrypt.org [https://avatars3.githubusercontent.com/u/3170529?s=400&v=4]<https://github.com/boostorg/beast/blob/develop/example/common/server_certif…> boostorg/beast<https://github.com/boostorg/beast/blob/develop/example/common/server_certif…> HTTP and WebSocket built on Boost.Asio in C++11. Contribute to boostorg/beast development by creating an account on GitHub. github.com

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[MPL][MP11] Return value of at_c for out of range index
by Mateusz Loskot 05 Mar '19

05 Mar '19

Hi, While porting some code from MPL to MP11, the latter helped to find some bugs in the ported code [1] I looked closer at those and found 'behavioural' differences between MPL and MP11 when accessing sequences with index value that is out of range. Could anyone help me to understand the following? 1. Why this compiles? using R = at_c<range_c<int, 0, 1>, 100>::type; Tested in C++11 using GCC, clang, MSVC from VS2017/2019 2. Why this compiles in GCC and clang, but fails with MSVC? using V = at_c<vector3_c<unsigned, 1, 2, 3>, 100>::type::type; 3. For GCC and clang, why this compiles static_assert(std::is_same<R, integral_c<int, 100>>::value, ""); but this fails? static_assert(std::is_same<V, integral_c<unsigned int, 100>>::value, ""); Don't vector_c and range_c yield equivalent sequences? By the way, MP11's mp_at_c yield void, as expected, there also no ::type or ::value member, so diagnostics is clearer. [1] https://github.com/boostorg/gil/issues/249 Best regards, -- Mateusz Loskot, http://mateusz.loskot.net

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Installing multiple versions of Boost libraries on Linux: Ubuntu & Debian.
by Stephen Gray 05 Mar '19

05 Mar '19

Please could someone advise how to install multiple releases of the Boost libraries on a Linux (Ubuntu & Debian) system and set the system paths to permit switching between them; so that a compiler refers to the desired version and the relevant runtime components are available to an application; e.g. the .so file for boost serialization. Thanks.

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Spatial search with boost r tree
by Bozo Vazic 01 Mar '19

01 Mar '19

Hi all, I'm trying to create a boost r tree with packing algorithm that will store 2D or 3D geometric points. This will be applied in side my peridynamic software for what we call "family search". Family search is basically a simple spatial search where each point of the peridynamic mesh (cloud of geometric points) needs to find all points inside it's horizon (horizon is for 2D a circle with a specific radius and for 3D it's a sphere with a specific radius). What I've found so far were examples for distance search using a random point (not the point that is a r-tree member). I did a distance and index check using bg::index::satisfies by passing a method that checks if the index is different and is distance smaller than radius. Also I use within(box) to constrain my search, but I'm not sure that is the correct way to use r tree spatial search for the point that is a member of the same r tree. Because as far as I understand the point in the r-tree knows has the information of boxes in which it is contained, so wouldn't there be a way to query the tree member using using only the horizon value? The reason why I'm asking this question is because I need to define most optimal spatial search so that query times don't take to long. This is important as I can have several million points that need to be constantly queried. Thnx in advance for all the help. Best Regads Bozo Here is my code for 2D search of only one point #include "stdafx.h" #include <boost/function_output_iterator.hpp> #include <boost/geometry/index/rtree.hpp> #include <boost/geometry.hpp> #include <boost/geometry/geometries/point.hpp> #include <boost/geometry/geometries/box.hpp> #include <vector> #include <iostream> namespace bg = boost::geometry; namespace bgi = bg::index; typedef bg::model::point <double, 2, bg::cs::cartesian> point; typedef std::pair<point, std::size_t> pointI; typedef bg::model::box<point> box; typedef std::pair<point, unsigned> value; bool CheckIndexAndDist(pointI i, pointI j, size_t dist); std::vector<uint64_t> res; struct StoreDataCallback { template <typename Value> void operator()(Value const& v) { res.push_back(v.second); } }; int _tmain(int argc, _TCHAR* argv[]) { std::vector<point> contourCenters; // has some value std::vector<pointI> cloud; double length = 2000; double width = 2000; double dX = length/1000.0; double horizon = 3.015*dX; for(int i = 0; i < length; i++) { for(int j = 0; j < width; j++) { point p; p.set<0>((-1.0 * length / 2.0) + dX + j * dX); p.set<1>((-1.0 * width / 2.0) + dX + i * dX); contourCenters.push_back(p); } } size_t id_gen = 0; std::transform( contourCenters.begin(), contourCenters.end(), back_inserter(cloud), [&](point const& p) { return std::make_pair(p, id_gen++); } ); bgi::rtree<pointI, bgi::quadratic<16> > rtree(cloud); // spatial search box query_box(point(cloud[10].first.get<0>() - 3.2*dX, cloud[10].first.get<1>() - 3.2*dX),point(cloud[10].first.get<0>() + 3.2*dX, cloud[10].first.get<1>() + 3.2*dX)); StoreDataCallback callback; rtree.query( bgi::within(query_box) && bgi::satisfies([&](value const& v) {return CheckIndexAndDist(v, cloud[10],3.015*dX);}), boost::make_function_output_iterator(callback)); return 0; } bool CheckIndexAndDist(pointI i, pointI j, size_t dist) { if( i.second != j.second && (bg::distance(i.first, j.first) < dist)) return true; else return false; }

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Boost archive import error.
by Stephen Gray 01 Mar '19

01 Mar '19

Dear boost-users, On Debian 8 I've compiled a Python extension written in c++ using pip install against Boost_1_66_0. My source code includes: #include "boost/archive/text_iarchive.hpp" #include "boost/archive/text_oarchive.hpp" #include "boost/serialization/map.hpp" #include "boost/serialization/deque.hpp" At runtime I receive the error: ImportError: /home/stephen/envs/pyclonestream/lib/python3.4/site-packages/pyclonestream.cpython-34m.so: undefined symbol: _ZN5boost7archive18text_iarchive_implINS0_13text_iarchiveEE13load_overrideERNS0_15class_name_typeEi I don't know what's wrong here. Please, any suggestions to fix the issue?

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[Concept] Understanding Boost Concept library
by Robert Jones 28 Feb '19

28 Feb '19

This is a small excerpt from the Boost Concepts library, there's various rather unusual techniques employed in it, with preprocessor tricks and various compiler specific tweeks, but this one has defeated me! What is the purpose of "*********** Model:: ***********" ? Maybe it's just to generate a distinctive diagnostic, but it's very sensitive to exact numbers of asterisks! In general what's going on here is the compiler is checking that the destructor of the Model (which is a concept instantiated with a particular type), can be instantiated, but without ever running the destructor or creating an instance of the Model. struct failed {}; template <class Model> struct requirement<failed ************ Model::************> { static void failed() { ((Model*)0)->~Model(); } }; Any insight appreciated. Kind Regards Rob.

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Ambiguous symbols possibly caused by Boost 1.69.0
by tim＠raisedbar.net 27 Feb '19

27 Feb '19

Hi, I'm getting several instances of the following kind of error when I build my code, which does not use boost::thread, etc., as I use the STD versions: 1>c:\program files (x86)\microsoft visual studio\2017\community\vc\tools\msvc\14.16.27023\include\condition_variable(1 24): error C2872: 'xtime': ambiguous symbol 1>c:\program files (x86)\microsoft visual studio\2017\community\vc\tools\msvc\14.16.27023\include\thr\xtimec.h(18): note: could be 'xtime' 1>c:\program files\boost\boost\thread\lock_types.hpp(31): note: or 'boost::xtime' My research turned up: https://svn.boost.org/trac10/ticket/11477?cversion=0&cnum_hist=10 So I added the following value for Windows 10 to my preprocessor: _WIN32_WINNT=0x0601; Unfortunately, this makes no difference. Can anybody advise me of a way forward, please? Best wishes. Tim Burgess Raised Bar Ltd. E: <mailto:tim@raisedbar.net> tim(a)raisedbar.net M: +44 (0)7989 486976

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hi i am a beginner user, there are some problem when using the library, can anyone help me with that ? plz
by ching han 25 Feb '19

25 Feb '19

i am trying to use the boost polygon function for example boost::geometry::read_wkt("multipolygon(((0 0 , 3 0 , 3 2 , 0 2)))", q); however i want to use the changing input such as "multipolygon(((A B, 0 2, 0 0, 4 0, 4 0)))" and A, B are the parameters defined by my previous array, but it ends up with showing the bad lexical cast since the parameters A and B can not be used or read if there is any solution that i can use the changing parameters as my polygon input, i kept searching for the answer but still can not find it can anyone plz help me, and i will be so grateful with that. thanks again!

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[release] 1.70.0 closed for major changes
by Marshall Clow 23 Feb '19

23 Feb '19

The master branch is now closed for new libraries and breaking changes, and will be closing for the beta in one week. Also, if you're ready, you can also add your libraries' changes to the release notes at: < https://github.com/boostorg/website/blob/master/feed/history/boost_1_69_0.q… > After editing the release notes, you should get a form to create a pull request, remember to submit it, otherwise I won't see your change. As always, the calendar for the release cycle is available at: https://www.boost.org/development/ Thanks, -- The Boost Release Team

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