- Boost - lists.preview.boost.org

TROJAN INFECTION boost 1.67 binaries for Windows x64 MSVC 14.1
by Zipper Fish 28 Jul '18

28 Jul '18

Dear boost developers and/or release managers: Today I downloaded boost_1_67_0-msvc-14.1-64.exe from the Windows binaries downloads page: https://dl.bintray.com/boostorg/release/1.67.0/binaries/ The file contains a Trojan, according to Windows Defender. Screenshot: https://usercontent.irccloud-cdn.com/file/Uy6o19AC/2018-07-26%2016_29_52-Wi… Someone should verify this & check the other pre-built binaries ASAP to reduce exposure. Thank you & best regards

6 11

Design question SafeFloat
by Damian Vicino 28 Jul '18

28 Jul '18

Hi, I'm working in simplifying safe_float to prepare it for future review. For now I'm focusing in a C++17 compatible version. Currently safefloat receives 2 template parameters: template<typename FP, typename P> class safe_float ... Where FP is the floating point value being made "safe", float, double, long double ... and P is a Policy of what to check and how to react. The how to react is a class that I pass by template parameter to the Policy. So, policy looks like: template<typename R> class policy_x .... I had a very complicated way of producing those policies, I used many TMP tricks so the logic stays in the policy and combines, but now that if-constexpr is available it may not make sense to take that path anymore. And, I see it may be better to simplify as much as possible. So, I'm thiking in make policy like a "config" description and put if constexprs in the safe_float class to decide what to do based in that. I want a bad policy to fail execution. I'm wondering what is the best approach for defining that "config-like" policy. A policy check is a bidimensional matrix of the operation affected and the flags considered (FE_ENV flags). For example, I want a policy to tell something like "check overflow in additions and underflow in division". These are the options I'm considering 1) define typenames for each flag and assign them tuple of affected operations class addition; class division; class multiplication; class subtraction; template<typename R> struct policy_x { using reporter=R; using overflow=tuple<addition>; using underflow=tuple<division>; using invalid=tuple<>; using inexact=tuple<>; }; 2) define typename by operation, passing class with constexprs of flags being evaluated struct empty_check{ static constexpr bool check_overflow=false; static constexpr bool check_underflow=false; static constexpr bool check_invalid=false; static constexpr bool check_inexact=false; }; struct check_overflow : public empty_check { static constexpr bool check_overflow=true; }; struct check_underflow : public empty_check { static constexpr bool check_underflow=true; }; template<typename R> struct policy_x { using reporter=R; using addition=check_overflow; using subtraction=empty_check; using multiplication=empty_check; using division=check_underflow; }; 3) similar to 2, but using true_type, and false_type in place of constexpr variables. struct empty_check{ using check_overflow=false_type; using check_underflow=false_type; using check_invalid=false_type; using check_inexact=false_type; }; struct check_overflow : public empty_check { using check_overflow=true_type; }; struct check_underflow : public empty_check { using check_underflow=true_type; }; template<typename R> struct policy_x { using reporter=R; using addition=check_overflow; using subtraction=empty_check; using multiplication=empty_check; using division=check_underflow; 4) other options? Thanks for any comments in advance. Damian

3 4

Promise/A+ like javascript in cpp
by hawk x 27 Jul '18

27 Jul '18

Hi, Javascript Promise creates a task chain to help develop asynchronized application with single thread. I did not find a good implement of this kind of "Promise" in c++, so i create one named "promise-cpp" here -- https://github.com/xhawk18/promise-cpp with which, we can write asynchronized tasks like sequential flows. Here's an example of promisifed http client in boost::asio -- https://github.com/xhawk18/promise-cpp/blob/master/test/asio_http_client.cpp "promise-cpp" would be the best friend to boost::asio's asynchronized task for single thread, and it is not std::promise. Thanks for you reviewing this library and any suggestion will be appreciated!

3 4

Docker environment(s) for Boost Development
by James E. King, III 26 Jul '18

26 Jul '18

I submitted a pull request into the superproject containing some docker scripts. The intention of this is to simplify managing a docker build environment for boost: https://github.com/boostorg/boost/pull/184 I'm wondering if folks will find this useful, and whether folks think this should be in its own submodule instead of being in boostorg/boost. I only have an Ubuntu Bionic environment in this pull request but it wouldn't be that difficult to add debian, centos, and others, as well as various versions of each. I have tested it on Unix and on Windows. On Unix the performance is quite good overall - but on Windows since they use SMB to do the sharing it is really slow (I would say a good 20 times slower between typing "b2" and getting the first output as it scans through all the files. I would recommend continuing to use a virtual machine on Windows Hosts for unix boost development, but this option is there and hopefully they will improve things. This partially came out of the discussion we had a number of months back about how we handle third party dependencies. For the most part one has to look at README files in various locations to learn about them. This is an attempt to pull all the dependencies together for a complete build into one place (the Dockerfile). One day when Microsoft supports Visual Studio compilation inside a reasonably sized windows container (i.e. based on nanoserver and not Windows Server Core), I'd like to add that as well since managing the dependencies on Windows is a bit harder (you usually have to build them). Thanks, Jim

5 8

boost include directory question
by Robert Ramey 21 Jul '18

21 Jul '18

The current instructions for doing boost development are approximately: a) clone the boost super project from github. b) invoke b2 headers which does one of: 1) creates links in the boost root directory to individual projects 2) or copies boost directories from individual libraries into the boost root directory. depending on whether it is a windows system or other system. Since I test for both windows and other systems, this is somewhat of a pain. In considering my options, I'm wondering if specifying all the boost library include directories in the CPLUS_INCLUDE_PATH environmental variable (gcc compilers) or INCLUDE (msvc). a) Has this been considered before? b) Was it considered when the current system was setup? c) Is there an reason why it wouldn't be a good idea? Anyone with information on this is free to chime in. Actually anyone is free to chime in. Robert Ramey

3 4

[concept_check] stl_concept_covering - compiler, stdlib, boost, or test issue?
by James E. King III 20 Jul '18

20 Jul '18

Hi folks, The test stl_concept_covering is annotated with "gcc bug" on a number of tests, and yet gcc 7.3.0 (with libstdc++) and clang-6.0 (with libc++ or libstdc++) fail to compile this test, mostly on the sections marked as a bug. For example: "/usr/bin/clang++-6.0" -c -x c++ -stdlib=libc++ -fPIC -m64 -O0 -fno-inline -Wall -g -DBOOST_ALL_NO_LIB=1 -I"../.." -o "../../bin.v2/libs/concept_check/test/ stl_concept_covering.test/clang-linux-6.0/debug/stl_concept_covering.o" "test/stl_concept_covering.cpp" In file included from test/stl_concept_covering.cpp:9: /usr/local/include/c++/v1/algorithm:999:24: error: invalid operands to binary expression ('boost::input_iterator_archetype<boost::equality_comparable2_first_ar chetype<boost::null_archetype<int> >, 0>::reference' and 'const boost::equality_comparable2_second_archetype<boost::null_archetype<int> >') if (*__first == __value_) ~~~~~~~~~~ ^ ~~~~~~~~ test/stl_concept_covering.cpp:152:15: note: in instantiation of function template specialization 'std::__1::find<boost::input_iterator_archetype<boost::equalit y_comparable2_first_archetype<boost::null_archetype<int> >, 0>, boost::equality_comparable2_second_archetype<boost::null_archetype<int> > >' requested here in = std::find(in, in, value); Full log with gcc-7.3.0 here: https://travis-ci.org/boostorg/concept_check/jobs/404203085#L1517 What's interesting is that if I change the type of in to an input_iterator_archetype_no_proxy the test passes. When I look at the concept_archetypes I see that input_iterator_archetype is a template with a default parameter, but also defines "reference" as a structure with an operator(), instead of using a typedef which is what I usually see done. So this makes me wonder if it's really a compiler issue (both compilers and std C++ libs complain the same way though) or if the archetype is invalid. I'm not sure the best course of action. It does cause most CI build jobs to fail, except MSVC jobs interestingly enough. Any thoughts you could share on this would be appreciated. The PR with all the build jobs showing errors can be found here: https://github.com/boostorg/concept_check/pull/13 Thanks, Jim

3 4

[range] [concepts] Boost 1.68 beta build error in RandomAccessIteratorConcept using latest MSVC
by Viktor Sehr 20 Jul '18

20 Jul '18

The following error is emitted in latest MSVC building Boost 1.68 beta: 1>\boost\range\concepts.hpp(257): error C3646: 'n': unknown override specifier 1>\boost\range\concepts.hpp(264): note: see reference to class template instantiation 'boost::range_detail::RandomAccessIteratorConcept<Iterator>' being compiled 1>\range\concepts.hpp(257): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int Unfortunately I'm not competent enough to determine what is causing the error: Full struct: template<class Iterator> struct RandomAccessIteratorConcept : BidirectionalIteratorConcept<Iterator> { #if BOOST_RANGE_ENABLE_CONCEPT_ASSERT BOOST_RANGE_CONCEPT_ASSERT(( Convertible< BOOST_DEDUCED_TYPENAME RandomAccessIteratorConcept::traversal_category, random_access_traversal_tag >)); BOOST_CONCEPT_USAGE(RandomAccessIteratorConcept) { i += n; i = i + n; i = n + i; i -= n; i = i - n; n = i - j; } private: // MSVC 14.1 - avoid C4596: 'difference_type': illegal qualified name in member declaration #if defined(_MSC_VER) && _MSC_VER >= 1912 BOOST_DEDUCED_TYPENAME difference_type n; #else BOOST_DEDUCED_TYPENAME RandomAccessIteratorConcept::difference_type n; #endif Iterator i; Iterator j; #endif }; br/Viktor Sehr

3 3

[system] Clang CI builds broken because of constexpr
by Andrey Semashev 20 Jul '18

20 Jul '18

Hi, I'm seeing these errors in Travis CI builds with Clang 3.8, 3.9, 4.0 and 5.0: ./boost/system/error_code.hpp:232:41: error: constexpr constructor never produces a constant expression [-Winvalid-constexpr] BOOST_SYSTEM_CONSTEXPR explicit std_category( boost::system::error_category const * pc ): pc_( pc ) ^ ./boost/system/error_code.hpp:232:41: note: non-constexpr constructor 'error_category' cannot be used in a constant expression /usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/system_error:69:5: note: declared here error_category() noexcept; ^ I'm assuming this is because the compiler uses libstdc++ from gcc 4.8, in which error_category() is not marked constexpr. Can this be fixed somehow?

2 2

Looking for help on preparing for review
by Damian Vicino 20 Jul '18

20 Jul '18

Hi, I'm preparing my library safe_float to be proposed for review. The library was born in the GSOC2015, but it never reached a review ready state. My plan is to change that in the next few months. At this point, I'm looking for some volunteers to proof-read the documentation. Code is going through major rewrite, and I will send another mail looking for help with reviewing the code when that is done. The most current documentation can be read directly from the web here: https://sdavtaker.github.io/safefloat/ Any comment is appreciated. Best regards, Damian

5 9

[Compute] Conflict between boost::compute::zip_iterator and boost::iterators::zip_iterator
by fortenberry.rm＠protonmail.com 18 Jul '18

18 Jul '18

I'd like to use boost::compute and boost::range together, like below, but if I uncomment the '#include <boost/range/combine.hpp>' line I get an error saying that boost::compute::zip_iterator and boost::iterators::zip_iterator are ambiguous. Is there a way around this, so that I can use boost::compute and boost::range together in the same cpp file? I am using on Windows vs2015 64bit. Boost 1.67.0. Code: #include <vector> #include <iostream> #include <algorithm> //#include <boost/range/combine.hpp> #include <boost/compute/lambda.hpp> #include <boost/compute/functional/math.hpp> #include <boost/compute/container/vector.hpp> #include <boost/compute/algorithm/transform.hpp> namespace compute = boost::compute; using compute::float4_; using compute::lambda::_1; using compute::lambda::_2; using compute::lambda::distance; int main() { // get default device and setup context compute::device device = compute::system::default_device(); compute::context context(device); compute::command_queue queue(context, device); // generate random data on the host std::vector<float4_> a(10000); std::vector<float4_> b(10000); std::vector<float> r(10000); std::generate((float*)a.data(), (float*)(a.data() + a.size()), rand); std::generate((float*)b.data(), (float*)(b.data() + b.size()), rand); // create a vector on the device compute::vector<float4_> _a(a.size(), context); compute::vector<float4_> _b(b.size(), context); compute::vector<float> _r(r.size(), context); // transfer data from the host to the device compute::copy(a.begin(), a.end(), _a.begin(), queue); compute::copy(b.begin(), b.end(), _b.begin(), queue); boost::compute::transform( _a.begin(), _a.end(), _b.begin(), _r.begin(), distance(_1, _2), queue ); // copy values back to the host compute::copy(_r.begin(), _r.end(), r.begin(), queue); for (int i = 0; i < a.size(); ++i) { float4_ va = a[i]; float4_ vb = b[i]; float vr = r[i]; float e = std::sqrt(std::pow(va[0] - vb[0], 2) + std::pow(va[1] - vb[1], 2) + std::pow(va[2] - vb[2], 2) + std::pow(va[3] - vb[3], 2)); std::cout << std::setprecision(12); if (std::abs(e - vr) > 1e-2) std::cout << e << " != " << vr << "\n"; } return 0; } Error, truncated for brevity. I can post the full error log if it is helpful: 1>------ Build started: Project: demo, Configuration: Debug x64 ------ 1> demo.cpp 1> This header is implementation detail and provided for backwards compatibility. 1>C:\local\boost_1_67_0\boost/compute/algorithm/transform.hpp(67): error C2668: 'boost::compute::make_zip_iterator': ambiguous call to overloaded function 1> C:\local\boost_1_67_0\boost/compute/iterator/zip_iterator.hpp(276): note: could be 'boost::compute::zip_iterator,boost::compute::buffer_iterator,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>> boost::compute::make_zip_iterator,boost::compute::buffer_iterator,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type,boost::tuples::null_type>>(IteratorTuple)' 1> with 1> [ Thanks, Madison

2 2