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Memory usage of boost::unordered_multimap and boost::unordered_multimap
by Ram 06 Oct '17

06 Oct '17

Hi, I need help in determining the amount of memory used by boost::unordered_multimap and boost::unordered_multimap. We have a large code base and we have some optimizations done using boost::unordered_multimap and boost::unordered_multimap. The speed it really good, but we want to measure the amount of space it is occupying. Can somebody please help with that? I would not be able to change to use a custom new/delete. Thanks

3 5

Why no mpl::_double?
by Florian Lindner 06 Oct '17

06 Oct '17

Hello, is there a reason why there are only integral types in the boost MPL, no double or alike? http://www.boost.org/doc/libs/1_65_1/libs/mpl/doc/refmanual/numeric.html What is the best way to achieve: template<> struct getArg<Multiquadrics> : boost::mpl::double_<1e-3> {}; so that it is compatible with mpl::list? besides just writing the struct myself :-) Thanks, Florian

1 0

[stacktrace] Test failures with Xcode 9
by Nat Goodspeed 06 Oct '17

06 Oct '17

I've just started building Boost 1.65.1 Stacktrace. On Mac with Xcode 9, I'm dismayed that it has failed a couple of its own self-tests. Lengthy (albeit snipped) output follows. darwin.compile.c++ bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/test.o "g++" -O3 -Wall -pedantic -g -dynamic -gdwarf-2 -fexceptions -Wno-long-long -Wno-inline -fPIC -arch x86_64 -DBOOST_STACKTRACE_GNU_SOURCE_NOT_REQUIRED -O3 -fPIC -gdwarf-2 -stdlib=libc++ -mmacosx-version-min=10.9 -iwithsysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/ -DLL_RELEASE=1 -DLL_RELEASE_FOR_DOWNLOAD=1 -DNDEBUG -DPIC -DLL_DARWIN=1 -DLL_OS_DRAGDROP_ENABLED=1 -DCARES_STATICLIB -DLIB_NDOF=1 -Wno-c99-extensions -Wno-unused-const-variable -Wno-unused-function -Wno-unused-local-typedef -Wno-variadic-macros -std=c++14 -DBOOST_ALL_NO_LIB=1 -DBOOST_STACKTRACE_USE_ADDR2LINE -DNDEBUG -I"." -I"/Users/nat/linden/3p-boost-64/boost/stage/packages/include" -I"/Users/nat/linden/3p-boost-64/boost/stage/packages/include/zlib" -c -o "bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/test.o" "libs/stacktrace/test/test.cpp" darwin.compile.c++ bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/test_impl.o "g++" -O3 -Wall -pedantic -g -dynamic -gdwarf-2 -fexceptions -Wno-long-long -Wno-inline -fPIC -arch x86_64 -DBOOST_STACKTRACE_GNU_SOURCE_NOT_REQUIRED -O3 -fPIC -gdwarf-2 -stdlib=libc++ -mmacosx-version-min=10.9 -iwithsysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/ -DLL_RELEASE=1 -DLL_RELEASE_FOR_DOWNLOAD=1 -DNDEBUG -DPIC -DLL_DARWIN=1 -DLL_OS_DRAGDROP_ENABLED=1 -DCARES_STATICLIB -DLIB_NDOF=1 -Wno-c99-extensions -Wno-unused-const-variable -Wno-unused-function -Wno-unused-local-typedef -Wno-variadic-macros -std=c++14 -DBOOST_ALL_NO_LIB=1 -DBOOST_STACKTRACE_USE_ADDR2LINE -DNDEBUG -I"." -I"/Users/nat/linden/3p-boost-64/boost/stage/packages/include" -I"/Users/nat/linden/3p-boost-64/boost/stage/packages/include/zlib" -c -o "bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/test_impl.o" "libs/stacktrace/test/test_impl.cpp" darwin.link bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho "g++" -o "bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho" "bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/test.o" "bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/test_impl.o" -g -Wl,-dead_strip -no_dead_strip_inits_and_terms -arch x86_64 testing.capture-output bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho.run status=0 if test $status -ne 0 ; then echo Skipping test execution due to testing.execute=off exit 0 fi "bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho" > "bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho.output" 2>&1 < /dev/null status=$? echo >> "bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho.output" echo EXIT STATUS: $status >> "bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho.output" if test $status -eq 0 ; then cp "bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho.output" "bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho.run" fi verbose=0 if test $status -ne 0 ; then verbose=1 fi if test $verbose -eq 1 ; then echo ====== BEGIN OUTPUT ====== cat "bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho.output" echo ====== END OUTPUT ====== fi exit $status ====== BEGIN OUTPUT ====== ... 0# foo1(int) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 1# foo2(int, std::__1::pair<boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> >, boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> > > (*)(int)) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 2# foo1(int) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 3# foo2(int, std::__1::pair<boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> >, boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> > > (*)(int)) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho ... 14# foo1(int) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 15# foo2(int, std::__1::pair<boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> >, boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> > > (*)(int)) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 16# void test_nested<15ul>() in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 17# main in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho libs/stacktrace/test/test.cpp(200): test 'min_size > 2' failed in function 'void test_frame()' ' 0# foo1(int) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 1# foo2(int, std::__1::pair<boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> >, boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> > > (*)(int)) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 2# foo1(int) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 3# foo2(int, std::__1::pair<boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> >, boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> > > (*)(int)) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho ... 300# foo1(int) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 301# foo2(int, std::__1::pair<boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> >, boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> > > (*)(int)) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 302# void test_nested<300ul>() in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 303# main in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho ' 0# foo1(int) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 1# foo2(int, std::__1::pair<boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> >, boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> > > (*)(int)) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 2# foo1(int) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 3# foo2(int, std::__1::pair<boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> >, boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> > > (*)(int)) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho ... 300# foo1(int) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 301# foo2(int, std::__1::pair<boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> >, boost::stacktrace::basic_stacktrace<std::__1::allocator<boost::stacktrace::frame> > > (*)(int)) in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 302# void test_nested<300ul>() in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho 303# main in /Users/nat/linden/3p-boost-64/boost/bin.v2/libs/stacktrace/test/addr2line_ho.test/darwin-4.2.1/release/debug-symbols-on/addr2line_ho libs/stacktrace/test/test.cpp(282): test 'boost::stacktrace::stacktrace(1, 1).size() == 1' failed in function 'int main()' 2 errors detected. EXIT STATUS: 1 ====== END OUTPUT ======

1 3

[Units]
by CD Clark 06 Oct '17

06 Oct '17

I am trying to create a set of units to use in a library, but I having trouble getting IO to work for some of them. Here is a simple example that demonstrates the problem. ============================ #include<iostream> #include <boost/units/systems/si.hpp> #include <boost/units/systems/si/io.hpp> using namespace boost::units; // short hand for meter namespace t { typedef si::length m; } namespace i { BOOST_UNITS_STATIC_CONSTANT( m, t::m ); } // centimeter namespace t { typedef make_scaled_unit< si::length, scale< 10, static_rational<-2> > >::type cm; } namespace i { BOOST_UNITS_STATIC_CONSTANT( cm, t::cm ); } // meter squared namespace t { typedef multiply_typeof_helper< m, m>::type m_m; } namespace i { BOOST_UNITS_STATIC_CONSTANT( m_m, t::m_m ); } // centimeter squared namespace t { typedef multiply_typeof_helper< cm, cm>::type cm_cm; } namespace i { BOOST_UNITS_STATIC_CONSTANT( cm_cm, t::cm_cm ); } // meter centimeter namespace t { typedef multiply_typeof_helper< m, cm>::type m_cm; } namespace i { BOOST_UNITS_STATIC_CONSTANT( m_cm, t::m_cm ); } // override default output, which prints "c(m^2)" namespace boost { namespace units { inline std::string name_string(const t::m_cm&) { return "meter centimeter"; } inline std::string symbol_string(const t::m_cm&) { return "m cm"; } } } // trying to overload output for centimeter squared namespace boost { namespace units { inline std::string name_string(const t::cm_cm&) { return "centimeter squared"; } inline std::string symbol_string(const t::cm_cm&) { return "cm^2"; } } } int main(int argc, char *argv[]) { std::cout << i::m << std::endl; std::cout << i::cm << std::endl; std::cout << i::m_m << std::endl; std::cout << i::m_cm << std::endl; //std::cout << i::cm_cm << std::endl; // this won't compile quantity<t::m_m> a1(100*i::cm_cm); std::cout << a1<< std::endl; // should be 0.01 m^2 quantity<t::m_m> a2(100*i::m_cm); std::cout << a2<< std::endl; // should be 1 m^2 return 0; } ============================ Basically, I am just trying to create a convenient set of short hands. Unit types are put in a 't' namespace and instances are put in a 'i' namespace with the same name. This works fine for doing calculations and conversions with the units, but I am having trouble with getting output to work for some of them. In the example above I create a centimeter unit by scaling the meter. Then I create three different area units with the product_typeof_helper struct: meter squared, meter centimeter, and centimeter squared. Conversions work for all three of these, but output will not work for the centimeter squared unit. The program above outputs m cm m^2 m cm 0.01 m^2 1 m^2 If I uncomment the line that tries to print i::cm_cm it won't compile. I get an error that says 'symbol' is not a member of ... and points at a line that says str += Begin::item::symbol() I can't understand why it doesn't work for a product of two scaled units. cdclark

2 4

Re: [Boost-users] boost::process
by Chris Rodgers 06 Oct '17

06 Oct '17

To answer my own question - this is one working possibility using boost::process::extend... #include <boost/process.hpp> #include <boost/process/extend.hpp> int main() { boost::filesystem::path myPath(".........toRun.exe......."); auto set_own_window = [](auto & exec) { exec.creation_flags |= boost::detail::winapi::CREATE_NEW_CONSOLE_; std::cerr << "in set_own_window" << std::endl; /* just for debugging */ }; bp::child c(myPath, "argument1", boost::process::extend::on_setup=set_own_window); return 0; } This works. Is it the right approach, or is there a better way? Best wishes, Chris. On 05/10/2017 17:14, Chris Rodgers wrote: > Hi, > > I'm trying to use Boost 1.65.1's boost::process::child in a Windows > console program. > > At the moment, the child process is launched in the same console window > as the parent. > > Is there an option to make a new console window for the child? > > The pre-boost-incorporation version of boost::process seemed to allow > manipulation of the startupInfo struct directly (e.g. > https://stackoverflow.com/questions/43582022/boostprocess-hide-console-on-w…) > and then a win32_launch call. But this seems to have been removed now? > > Any tips gratefully received. > > Thanks, > > Chris. >

1 0

PolyCollection requiring copyable
by d3fault 05 Oct '17

05 Oct '17

I'm impressed with PolyCollection. I use the list<interface*> strategy tons in my projects, and I didn't think NOT using a pointer there was even possible... but somehow you managed. It also makes sense why PolyCollection is faster to execute etc, the tutorial was well written. The only 'con' is that it requires a copy constructor. You mention later that some copy traits thing can be used to move the "copy code" outside of the class, but I am questioning the need for copying altogether. Is "copying" of the polymorphic types necessary for: a) Technical requirement otherwise it wouldn't compile b) Design decision because you think it's superior and helpful c) To facilitate copying of the PolyCollection object itself ....? If (b) or (c), can there be a slightly altered version of PolyCollection which does not allow/require copying? I'm completely fine (and even happier) _not_ being able to copy the PolyCollection. When I use the list<interface*> strategy, I tend to consider the list to be the owner of it's objects (and delete them when the list is deleted). There should be PolyCollection::emplace and the poly instances should "live" in the PolyCollection. Accessing the poly instances should be by [const] reference only (isn't this already the case? what benefit does the copy constructor bring?!?). I didn't examine the source so maybe it's (a) after all, in which case I apologize for wasting precious time, bandwidth, and disk space. d3fault

5 11

boost::process
by Chris Rodgers 05 Oct '17

05 Oct '17

Hi, I'm trying to use Boost 1.65.1's boost::process::child in a Windows console program. At the moment, the child process is launched in the same console window as the parent. Is there an option to make a new console window for the child? The pre-boost-incorporation version of boost::process seemed to allow manipulation of the startupInfo struct directly (e.g. https://stackoverflow.com/questions/43582022/boostprocess-hide-console-on-w…) and then a win32_launch call. But this seems to have been removed now? Any tips gratefully received. Thanks, Chris.

1 0

looking for a memory leak in an asio based application
by David Medine 05 Oct '17

05 Oct '17

I know that the answer to this question is /always/ 'no'. But is it possible, just possible that one can leak memory out of boost::asio? Let me explain. I work on an open source client/server data streaming library for multi-modal data streaming called labstreaminglayer (https://github.com/sccn/labstreaminglayer) At the core of the data transmission architecture is boost::asio. Now, to avoid calling collisions, the original author of the library shipped the source code with a name-mangled version of boost. Over the years this has yet to be updated so we are still relying on boost 1.57. The memory leak starts on the server side after a client is connected to it. This went undetected for years because it is very very slow and it depends on the sampling rate of the data stream. LSL (labstreaminglayer) is widely used in the neurophysiological research community (for whom the tool was intended), but normally in that field you are not sending samples faster than 500 Hz or so. But some devices are now available that offer relatively high sampling rates (e.g. Brain Products' actiCHamp can go as fast as 100kHz). The amount of memory that leaks seems to depend on how often data is sent, not how much data is send at a time. So, when the data is flowing quickly, the leak is severe. I am 99.99% sure that the allocation of memory for all the data I am sending is getting deallocated correctly. I don't see any leaking memory according to Visual Studio's diagnostic tools, nor can Deleaker spot anything. However, when I look at a server process in task manager, I can see the memory rising. I tried the asio::io_service::work trick (https://stackoverflow.com/questions/32258890/c-boost-asio-async-send-to-mem…) on my io_services, but this didn't have any effect. I have not gone through the whole pipeline yet, but I've been at this for two harrowing days already. So I just thought I would ask the list if anyone has seen anything like this before or if there has been any slow-leak fixes in boost (particularly asio) since 1.57 (I didn't see anything in the logs, but maybe I missed something). Due to the state of the project at this moment, it is non-trivial to update the name-mangled boost to another version, but it is far less trivial than the needle-in-a-haystack game I am playing right now. So, if someone can say with authority a boost update will fix everything I'll just do that and be happy. It's a long-shot, I know.

2 1

Bost Logging
by Mário Costa 04 Oct '17

04 Oct '17

Hi, I'm havving a bad time trying to figure out how to add and log custom keywords using boost/log. I havent been able to understand how exactly attribute keywords (BOOST_LOG_ATTRIBUTE_KEYWORD) bind with logging e.g. using BOOST_LOG_STREAM_WITH_PARAMS(logger, (??) (??)). For instance, if I define a keyword line_number, BOOST_LOG_ATTRIBUTE_KEYWORD(line_number, "LineNumber", unsigned int) and add it to the formmater logging::formatter formatter = expr::stream << "[" << line_number << "]" How do I use BOOST_LOG_STREAM_WITH_PARAMS(logger, (??)) Tanking an exemple from the severities, I should use a keyword parameter defining something like BOOST_PARAMETER_KEYWORD(sometag, line_number) then I should be able to use BOOST_LOG_STREAM_WITH_PARAMS(logger, (line_number = 10)) But those things just don add up together. I for sure missing the logics of the logging ... Thanks for any help! Cheers, mc

1 0

[geometry] Get points within certain radius?
by Florian Lindner 03 Oct '17

03 Oct '17

Hello, first of all thanks for the repliest to my previous geometry question! What is the best, especially fastest way to get all points within a certain radius of a point? Using the iterator method with nearest(pt, X) highly depends on X. Since I don't know this number, I have to guess it rather high. for (auto it = rtree.qbegin(bgi::nearest(point, results)) ; it != rtree.qend() ; ++it) { std::ignore = it; break; } results = 10 => time = 3.0s results = 100 => time = 22.6s results = 200 => time = 71.4s results = 300 => time = 153.2s though I always use just one result. The loop is inside another loop, not depending on results, so of course, the times are multiples of the actual times for that query. But clearly, choosing high numbers for results is not feasible. Another idea is to use the within() query with a circle of a radius. But bg seems to have no circle or sphere model. A workaround would be to use a box instead of a sphere. That means I have to test the results again, whether they are actually contained in th sphere. Alternatively, I could use the satisfies predicate. But wouldn't I give up all spatial information? This predicate needs to compare all vertices, don't it? It does include the knowledge, that when one point is discarded, all other points with a greater distance will discarded too. According to https://stackoverflow.com/questions/22909171/boostgeometry-nearest-neighbor…, the way to go seems to be to combine within(boundingBox) and satisfies(). Any other ideas? Thanks, Florian

2 1