June 2013 - Boost-users - lists.preview.boost.org

Re: [Boost-users] Mutex synchronised wrapper class for boost::interprocess shared memory vector of strings
by Riskybiz 24 Jun '13

24 Jun '13

Date: Wed, 19 Jun 2013 22:05:32 +0200 From: Ion Gazta?aga <igaztanaga(a)gmail.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Mutex synchronised wrapper class for boost::interprocess shared memory vector of strings Message-ID: <51C20F0C.8090408(a)gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed El 18/06/2013 16:28, Riskybiz escribi?: > I'm trying to write a wrapper class in C++ to give mutex synchronised > interprocess access to a shared memory vector of strings. This is my first > foray into boost::interprocess and allocators are proving something of a > mystery. > > Is anyone able to see why on compilation I get the error: When you build any container in shared memory it must be constructed with an allocator. Change your push function to (not charallocator is passed to MyShmString): void push(const std::string & in) { CharAllocator charallocator(m_segment->get_segment_manager()); scoped_lock<named_mutex> lock(*m_mutex); MyShmString inStr(in.c_str(), charallocator); sharedSegmentVector->push_back(inStr); } Best, Ion Thanks for the reply Ion. I'm now having trouble reading from the vector in the shared memory. I get an exception when calling read(0) or read(1). What I'm trying to do is read "testing testing 123" from the first element of the sharedSegmentVector. Is it necessary to use some particular type conversion technique in the reader function to access a sharedSegmentVector string element? Any help to get this working is much appreciated; I've been trying for more than a month to get to this point! Code below..... Thanks Riskybiz #ifndef SHARED_MEMORY_WRAPPER_H//if not defined already #define SHARED_MEMORY_WRAPPER_H//then define it #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/containers/vector.hpp> #include <boost/interprocess/containers/string.hpp> #include <boost/interprocess/allocators/allocator.hpp> #include <boost/interprocess/sync/named_mutex.hpp> using namespace boost::interprocess; class SharedMemoryWrapper { public: SharedMemoryWrapper(const std::string &name, bool server) : m_name(name), m_server(server) { if (server) { named_mutex::remove("named_mutex"); shared_memory_object::remove(m_name.c_str()); //Create shared memory managed_shared_memory m_segment(create_only, m_name.c_str(), 10000); //Create allocators CharAllocator charallocator(m_segment.get_segment_manager()); StringAllocator stringallocator(m_segment.get_segment_manager()); //This string is in only in this process (the pointer pointing to the //buffer that will hold the text is not in shared memory). //But the buffer that will hold "this is my text" is allocated from //shared memory MyShmString mystring(charallocator); mystring = "testing testing 1 2 3"; //This vector is fully constructed in shared memory. All pointers //buffers are constructed in the same shared memory segment //This vector can be safely accessed from other processes. MyShmStringVector *sharedSegmentVector = m_segment.construct<MyShmStringVector>("sharedSegmentVector")(stringallocato r); sharedSegmentVector->push_back(mystring); } else { //Open the shared segment managed_shared_memory m_segment(open_only, name.c_str()); //Find the vector using the c-string name and open it MyShmStringVector *sharedSegmentVector = m_segment.find<MyShmStringVector>("sharedSegmentVector").first; } m_mutex = new named_mutex(open_or_create, "named_mutex"); } ~SharedMemoryWrapper() { if (m_server) { named_mutex::remove("named_mutex"); //Destroy the vector from the managed_shared_memory m_segment->destroy_ptr(sharedSegmentVector);//This will free all strings that the vector contains m_segment->destroy<MyShmStringVector>("sharedSegmentVector");//Destroy the vector //Is it necessary to destroy the allocators here? //Remove the managed_shared_memory; this may fail if the memory does not exist or is mapped or opened by another process shared_memory_object::remove(m_name.c_str()); } delete m_mutex; delete m_segment; } //Writer void write(const std::string &in) { CharAllocator charallocator(m_segment->get_segment_manager()); scoped_lock<named_mutex> lock(*m_mutex); MyShmString shmStr(in.c_str(), charallocator); sharedSegmentVector->push_back(shmStr); } //Reader std::string read(long index) { CharAllocator charallocator(m_segment->get_segment_manager()); scoped_lock<named_mutex> lock(*m_mutex); MyShmString shmStr(sharedSegmentVector->at(index), charallocator); std::string stdStr = std::string(shmStr.begin(), shmStr.end()); return stdStr; } private: //Typedefs typedef boost::interprocess::allocator<char, managed_shared_memory::segment_manager> CharAllocator; typedef boost::interprocess::basic_string<char, std::char_traits<char>, CharAllocator> MyShmString; typedef boost::interprocess::allocator<MyShmString, managed_shared_memory::segment_manager> StringAllocator; typedef boost::interprocess::vector<MyShmString, StringAllocator> MyShmStringVector; bool m_server; std::string m_name; managed_shared_memory *m_segment; MyShmStringVector *sharedSegmentVector; named_mutex *m_mutex; };//class #endif//header guard

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[interprocess]shared_memory_object stores content in disk?
by Adrian Yu 24 Jun '13

24 Jun '13

I'm training multiple networks based on a single database. So to accelerate speed and reduce disk reading, I use shared_memory_object class provided by boost. Since the lab workstation is currently unavailable, I migrated my code to my personal computer. On the lab workstation, the host program successfully reads all data to memory. But on my PC, strangely it creates a file on system drive rather than storing the data in memory. The whole database is about 3.7 GB; the lab workstation has 32 GB memory and runs Windows Server 2008 R2; my PC has 8 GB memory and runs Windows 7. There should be enough memory to store the data. So why? Are there certain ways to force the program to keep all data in memory?

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[Interprocess] Allocation algorithms
by Oodini 24 Jun '13

24 Jun '13

Hello, I need to allocate and fill about 10 big memories areas (several Gb) at the startup of my program. The data will never be modified or freed after during the program lifetime, and will be *only read* an other processes. What allocation algorithm should I take from the ones provided by the library ? Should I create a new one, more efficient (no reallocations, no race conditions...) ? Thanks.

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[Interprocess] Minimal size of a managed_shared_memory
by Oodini 24 Jun '13

24 Jun '13

Hello, A managed_shared_memory is a typedef for a basic_managed_shared_memory using rbtree_best_fit as allocation algorithm. In the documentation : http://www.boost.org/doc/libs/1_53_0/doc/html/interprocess/memory_algorithm… It is said at the and of the page : "In most 32 systems with 8 byte alignment the minimum size of a block is 24 byte". I am on Windows XP SP3 32 bits. The alignement is 8 byte. But if I create a managed_shared_memory with a size lesser than 120 bytes, my app crashes. This value comes from several get_min_size function, the deepest being in the rbtree_best_fit class. So I wonder which value we can grant to the documentation above. How are the 120 bytes used ?

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Boost::Interprocess Documentation request
by Riskybiz 24 Jun '13

24 Jun '13

In the Boost::Interprocess documentation and under the heading "Where is this being allocated?"; is an example of how to create a vector of strings in a managed_shared_memory segment. Link to Boost::Interprocess documentation here: http://www.boost.org/doc/libs/1_53_0/doc/html/interprocess/allocators_contai ners.html#interprocess.allocators_containers.containers_explained Please could this example be extended to demonstrate; 1. How to add string elements to the shared memory vector from a different process? 2. How to access and copy strings from the shared memory vector from a different process? This really would be invaluable to people trying to use Boost::Interprocess for the first time! My particular project has ground to a halt for over a month simply trying to get a working implementation of a Boost::Interprocess mutex synchronised shared memory vector of strings. I would like one process to add strings to the shared memory vector and several other processes to read string data from the vector. Right now I don't know if I'll ever get it to work! Running out of ideas here! Hope someone can help. Thanks, Riskybiz.

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[property_tree] Serializing ptree to/from JSON
by Michael Powell 24 Jun '13

24 Jun '13

Hello, I am writing some code to serialize a package to/from JSON. Overall, it is working well, except for what appears to be a weak link in the ptree chain of events. I take a POCO (for all intents) and populate a ptree, then parse that to JSON using the property_tree JSON parser. No problem. Then I take that same string and want to parse it into another ptree. In and of itself, seems like it is no problem. The new ptree has a count, so I gather the parse worked. However, when I try to use ptree.count(path), or ptree.find(path), neither of these work. They are returning 0 or not_found(), respectively. I may be able to bypass that check for the moment and run it through ptree.get<Type>(path) for the time being, but that seems less desirable. Any insights on ptree along these lines? Thanks! Regards, Michael Powell

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[FunctionTypes] Getting functor/lambda parameters (VS2012)
by Mateusz Loskot 23 Jun '13

23 Jun '13

Hi, I'm using C++ compiler from the latest VS2012. I'm trying this simple technique to determined type of functor or lambda call parameter, it works well: #include <boost/function_types/parameter_types.hpp> int main() { auto foo = [](int) -> void {}; typedef decltype(foo) foo_type; typedef boost::function_types::parameter_types < decltype(&foo_type::operator()) >::type parameter_types; } Next, I move the typedef into class template, in constructor body, it works well too: template <typename T> struct A { A(T t) { typedef typename boost::function_types::parameter_types < decltype(&T::operator()) >::type parameter_types; } }; Finally, I move further with the technique, so I can access parameter types within class template scope: template <typename T> struct B { typedef typename boost::function_types::parameter_types < decltype(&T::operator()) >::type parameter_types; }; This example does compile with clang 3.4 (svn trunk) and GCC 4.8.1, but it does not compile with Visual C++ 11.0. Does anyone understand what C++11 feaure VS2012 is lacking so it prevents compilation of the sample with B template above? Here is complete .cpp file https://gist.github.com/mloskot/5846468 Best regards, -- Mateusz Loskot, http://mateusz.loskot.net

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install with b2 - conflicting documentation
by Kirk Joppy 23 Jun '13

23 Jun '13

Hello, I am trying to build the regex library which I will then use through MinGW. I already installed MinGW and added ..\MinGW\bin to my system PATH. I now want to build regex and put it somewhere. I am aware of two different pieces of documentation detailing how to do this: http://www.boost.org/doc/libs/1_53_0/more/getting_started/windows.html#prep… http://www.boost.org/doc/libs/1_53_0/doc/html/bbv2/installation.html The main difference seems to be whether you should be in BOOST_ROOT or BOOST_ROOT\tools\build\v2. Which is it? In either case I gather than I should do this $ bootstrap.bat gcc and in fact I've done that in both BOOST_ROOT and BOOST_ROOT\tools\build\v2 with apparent success. I just don't know what I'm supposed to do next. I tried running $ b2 --prefix=H:\boost-test --with-regex install from within BOOST_ROOT\tools\build\v2, and that put some stuff into H:\boost-text, but I couldn't find any actual library files. Before I screw around any more I thought I'd ask knowledgeable folks for the right way to do this. Thank you very much, kjoppy

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An example: how I learned to iterate through property trees (ptree)
by Cook, Rich 22 Jun '13

22 Jun '13

I just wanted to post a program I wrote that creates a boost::ptree, saves it to JSON, reads it back, then iterates through the tree and prints its nodes. #include <boost/property_tree/ptree.hpp> #include <boost/property_tree/json_parser.hpp> #include <string> #include <iostream> using namespace std; using boost::property_tree::ptree; string indent(int level) { string s; for (int i=0; i<level; i++) s += " "; return s; } void printTree (ptree &pt, int level) { if (pt.empty()) { cerr << "\""<< pt.data()<< "\""; } else { if (level) cerr << endl; cerr << indent(level) << "{" << endl; for (ptree::iterator pos = pt.begin(); pos != pt.end();) { cerr << indent(level+1) << "\"" << pos->first << "\": "; printTree(pos->second, level + 1); ++pos; if (pos != pt.end()) { cerr << ","; } cerr << endl; } cerr << indent(level) << " }"; } return; } int main(int, char*[]) { // first, make a json file: string tagfile = "testing2.pt"; ptree pt1; pt1.put("object1.type","ASCII"); pt1.put("object2.type","INT64"); pt1.put("object3.type","DOUBLE"); pt1.put("object1.value","one"); pt1.put("object2.value","2"); pt1.put("object3.value","3.0"); pt1.put("object4.type", "ASCII"); pt1.put("object4.value", "shallow"); pt1.put("object4.subobject1.type", "ASCII"); pt1.put("object4.subobject1.value", "deep child"); pt1.put("object4.subobject1.subsubobject.type", "ASCII"); pt1.put("object4.subobject1.subsubobject.value", "deep child"); pt1.put("object5.type", "ASCII"); pt1.put("object5.value", "shallow"); write_json(tagfile, pt1); ptree pt; bool success = true; //try { read_json(tagfile, pt); printTree(pt, 0); cerr << endl; return success; } PROGRAM OUTPUT: rcook@rzbeast (blockbuster): ./ptree { "object1": { "type": "ASCII", "value": "one" }, "object2": { "type": "INT64", "value": "2" }, "object3": { "type": "DOUBLE", "value": "3.0" }, "object4": { "type": "ASCII", "value": "shallow", "subobject1": { "type": "ASCII", "value": "deep child", "subsubobject": { "type": "ASCII", "value": "deep child" } } }, "object5": { "type": "ASCII", "value": "shallow" } } -- ✐Richard Cook ✇ Lawrence Livermore National Laboratory Bldg-453 Rm-4024, Mail Stop L-557 7000 East Avenue, Livermore, CA, 94550, USA ☎ (office) (925) 423-9605 ☎ (fax) (925) 423-6961 --- Information Management & Graphics Grp., Services & Development Div., Integrated Computing & Communications Dept. (opinions expressed herein are mine and not those of LLNL)

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[smart_ptr] enable_shared_from_this and shared_ptr to a base class
by Adam Romanek 21 Jun '13

21 Jun '13

Hi, I have a question related to using shared_from_this() and a shared_ptr to a base class. Here's a modified version of the enable_shared_from_this usage example from its documentation web page: #include <boost/enable_shared_from_this.hpp> #include <boost/shared_ptr.hpp> #include <cassert> class X { public: virtual void foo() = 0; }; class Y: public X, public boost::enable_shared_from_this<Y> { virtual void foo() { shared_from_this(); } }; int main() { X* x_ptr = new Y; boost::shared_ptr<X> sp(x_ptr); sp->foo(); } First, class Y is now derived from class X. Secondly, shared_ptr's template argument is now X and the parameter to the shared_ptr's constructor is now a pointer to X. Now, calling shared_from_this() in X and/or Y throws boost::bad_weak_ptr. Is this correct behavior? Is it documented somewhere? I know that the example is a bit unrealistic since most of the time shared_ptr is constructed directly from the pointer returned by 'new Y' or created by make_shared() but still, this is something that bothers me. WBR, Adam Romanek

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Re: [Boost-users] [Test]: Problem with simple Boost.Test
by Damien Kick 21 Jun '13

21 Jun '13

On Jun 20, 2013, at 8:38 PM, <boost-users-request(a)lists.boost.org<mailto:boost-users-request@lists.boost.org>> wrote: Date: Thu, 20 Jun 2013 17:01:54 +0000 (UTC) From: Gennadiy Rozental <rogeeff(a)gmail.com<mailto:rogeeff@gmail.com>> To: boost-users(a)lists.boost.org<mailto:boost-users@lists.boost.org> Subject: Re: [Boost-users] [Test]: Problem with simple Boost.Test Message-ID: <loom.20130620T185812-619(a)post.gmane.org<mailto:loom.20130620T185812-619@post.gmane.org>> Content-Type: text/plain; charset=utf-8 thusly:$ ${CXX} -c --std=c++0x -g -I${TARGET}/include cma.cpp -o cma.o $ ${CXX} --std=c++0x -g cma.o ${TARGET}/lib/libboost_test_exec_monitor.a \ ${TARGET}/lib/libboost_unit_test_framework.dylib -o cma I know docs are not ideal but this part is very clear I thought. test_exec_monitor is an old alternative t ounit test framework, which is long deprecated and they definitely do not require each other In this case, I wouldn't fault the docs per se but rather only my impatience in having tried "jumping directly to the subject of [my] interest" but not yet having realized exactly what my subject of interest really is/was nor how far I needed to jump in order to get to it ;-) I had been trying this: $ cat cma.cpp #define BOOST_TEST_MODULE cma #include <boost/test/unit_test.hpp> #include <iostream> #include <ostream> BOOST_AUTO_TEST_CASE(sanity) { std::clog << "Test the world!\n"; } $ ${CXX} -c --std=c++0x -g -I${TARGET}/include cma.cpp -o cma.o $ ${CXX} --std=c++0x -g cma.o ${TARGET}/lib/libboost_unit_test_framework.dylib -o cma Undefined symbols for architecture x86_64: "_main", referenced from: implicit entry/start for main executable ld: symbol(s) not found for architecture x86_64 collect2: error: ld returned 1 exit status $ But when I started reading through more of the documentation and got as far as <http://preview.tinyurl.com/lw7e688>, I realized that I needed to be doing something more like this: $ ${CXX} -c --std=c++0x -g -DBOOST_TEST_DYN_LINK -I${TARGET}/include cma.cpp -o cma.o $ ${CXX} --std=c++0x -g cma.o ${TARGET}/lib/libboost_unit_test_framework.dylib -o cma $ env DYLD_LIBRARY_PATH=${TARGET}/lib ./cma Running 1 test case... Test the world! *** No errors detected $ Thank you, Gennadiy, for having taken the time to respond to my question as well as having taken the time you spent on Boost.Test. ________________________________ This e-mail and any attachments are confidential. If it is not intended for you, please notify the sender, and please erase and ignore the contents.

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Re: [Boost-users] [Test]: Problem with simple Boost.Test
by Damien Kick 21 Jun '13

21 Jun '13

Date: Mon, 17 Jun 2013 23:03:16 +0000 (UTC) From: legalize+jeeves(a)mail.xmission.com<mailto:legalize+jeeves@mail.xmission.com> (Richard) To: boost-users(a)lists.boost.org<mailto:boost-users@lists.boost.org> Subject: Re: [Boost-users] [Test]: Problem with simple Boost.Test Message-ID: <kpo4jk$2ih$2(a)ger.gmane.org<mailto:kpo4jk$2ih$2@ger.gmane.org>> [Please do not mail me a copy of your followup] boost-users(a)lists.boost.org<mailto:boost-users@lists.boost.org> spake the secret code <7364AB234369D348AE1CEBC1A86132DBAD32EA(a)SVLITMX02.shoretel.com<http://SVLITMX02.shoretel.com>> thusly: $ ${CXX} -c --std=c++0x -g -I${TARGET}/include cma.cpp -o cma.o $ ${CXX} --std=c++0x -g cma.o ${TARGET}/lib/libboost_test_exec_monitor.a \ ${TARGET}/lib/libboost_unit_test_framework.dylib -o cma Why are you linking against boost_test_exec_monitor? I've never needed to do that. boost_unit_test_framework should be enough. Interesting. Because I'm finding the following: $ ${CXX} -c --std=c++0x -g -I${TARGET}/include cma.cpp -o cma.o $ ${CXX} --std=c++0x -g cma.o ${TARGET}/lib/libboost_unit_test_framework.dylib -o cma Undefined symbols for architecture x86_64: "_main", referenced from: implicit entry/start for main executable ld: symbol(s) not found for architecture x86_64 collect2: error: ld returned 1 exit status $ But that is also what I'm finding with the system GCC and the Fink install of Boost 1.46, and so that behavior isn't unique my attempt to build/use a Boost with GCC 4.8.0 using --std=c++0x. $ g++ -c -g -I/sw/include cma.cpp -o cma.o $ g++ -g -L/sw/lib cma.o -lboost_unit_test_framework-mt Undefined symbols for architecture x86_64: "_main", referenced from: start in crt1.10.6.o ld: symbol(s) not found for architecture x86_64 collect2: ld returned 1 exit status $ g++ --version i686-apple-darwin11-llvm-g++-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00) Copyright (C) 2007 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ fink list --tab boost1.46 Information about 7237 packages read in 1 seconds. i boost1.46.1.cmake 1.46.1-2 Boost C++ Libraries i boost1.46.1.cmake-shlibs 1.46.1-2 Boost C++ Libraries $ ________________________________ This e-mail and any attachments are confidential. If it is not intended for you, please notify the sender, and please erase and ignore the contents.

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matrix inversion in boost.
by Mohit Singh 21 Jun '13

21 Jun '13

Hi, I am trying to do a simple matrix inversion operation using boost. But I am getting an error. Basically what I am trying to find is inversted_matrix = inverse(trans(matrix) * matrix) But I am getting an error Check failed in file boost_1_53_0/boost/numeric/ublas/lu.hpp at line 299: detail::expression_type_check (prod (triangular_adaptor<const_matrix_type, upper> (m), e), cm2) terminate called after throwing an instance of 'boost::numeric::ublas::internal_logic' what(): internal logic Aborted (core dumped) My attempt: #include <boost/numeric/ublas/matrix.hpp> #include <boost/numeric/ublas/vector.hpp> #include <boost/numeric/ublas/io.hpp> #include <boost/numeric/ublas/vector_proxy.hpp> #include <boost/numeric/ublas/matrix.hpp> #include <boost/numeric/ublas/triangular.hpp> #include <boost/numeric/ublas/lu.hpp> namespace ublas = boost::numeric::ublas; template<class T> bool InvertMatrix (const ublas::matrix<T>& input, ublas::matrix<T>& inverse) { using namespace boost::numeric::ublas; typedef permutation_matrix<std::size_t> pmatrix; // create a working copy of the input matrix<T> A(input); // create a permutation matrix for the LU-factorization pmatrix pm(A.size1()); // perform LU-factorization int res = lu_factorize(A,pm); if( res != 0 ) return false; // create identity matrix of "inverse" inverse.assign(ublas::identity_matrix<T>(A.size1())); // backsubstitute to get the inverse lu_substitute(A, pm, inverse); return true; } int main(){ using namespace boost::numeric::ublas; matrix<double> m(4,5); vector<double> v(4); vector<double> thetas; m(0,0) = 1; m(0,1) = 2104; m(0,2) = 5; m(0,3) = 1;m(0,4) = 45; m(1,0) = 1; m(1,1) = 1416; m(1,2) = 3; m(1,3) = 2;m(1,4) = 40; m(2,0) = 1; m(2,1) = 1534; m(2,2) = 3; m(2,3) = 2;m(2,4) = 30; m(3,0) = 1; m(3,1) = 852; m(3,2) = 2; m(3,3) = 1;m(3,4) = 36; std::cout<<m<<std::endl; matrix<double> product = prod(trans(m), m); std::cout<<product<<std::endl; matrix<double> inversion(5,5); bool inverted; inverted = InvertMatrix(product, inversion); std::cout<<inversion<<std::endl; } -- Mohit "When you want success as badly as you want the air, then you will get it. There is no other secret of success." -Socrates

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[BGL] boykov_kolbogorov_max_flow() classes / groups
by Nil Goyette 20 Jun '13

20 Jun '13

I have been testing the the boykov_kolbogorov_max_flow function in the previous weeks and I have a question that I can't seem to find the answer myself. I asked for it on StackOverflow [1] but nobody answered. Can someone tell me why I get three classes (groups) instead of two? I always get class '0' and '4', and '1' on some cases. I thought a Graph Cut was supposed to output only two classes, so what's the meaning of '1'? Please read the SO question in [1] for more details. Thanks for your time. Nil Goyette [1] http://stackoverflow.com/questions/16905613/3-classes-0-1-4-on-boost-graph-…

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accumulator extended quantil value
by Philipp Kraus 20 Jun '13

20 Jun '13

Hello, I have got created an extended_p_square_quantile into an accumulator, with 3 quantils (0.25, 0.5, 0.75) as a boost::array. How can I get access to the quantil values of the accumulator? For the variance I use accumulator::variance(myacc), but a call with quantil(myacc, 0.5) does not work. Thanks Phil

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boost_1_53_0: no matching function for call to ‘hash_value
by Shailja Kumari 20 Jun '13

20 Jun '13

> Hi , > > I am using boost_1_53_0 for my applications build. The boost_1_53_0 is > throwing the following error message. > > boost_1_53_0/boost/functional/hash/extensions.hpp:269:34: error: no > matching function for call to ‘hash_value(const > Rubedo::Utils::Hashing::HashedString<16>&)’ > return hash_value(val); > ^ > > boost_1_53_0/boost/functional/hash/hash.hpp:187:57: error: no type named > ‘type’ in ‘struct > boost::hash_detail::basic_numbers<Rubedo::Utils::Hashing::HashedString<16> > >’ > > The following code build fine with boost_1_49_0, but have error with > boost_1_53_0 on linux. Do you have fixes for these ? Please let me know. > > Thanks > >

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boost serialisation, PORTABLE_BINARY_ARCHIVE fix required
by avib369 . 20 Jun '13

20 Jun '13

Currently portable binary archive is broken on AIX platforms. The reason is because the default 'char' type is unsigned on this platform. Whereas for most other platforms it is signed, By going through the portable binary and replacing 'char' with 'signed char' this long standing bug is fixed. I have tested the fix on Linux(opensuse103,opensuse113, HPUX, AIX(power6,power7) This is a fairly safe and quick fix, can I please ask the authors of this library to add this fix, for the next version of boost. Here are the changes I made: (flagged under ' // changed ' comment //-------------------------------------------------------- portable_binary_iarchive.hpp void load(signed char & t){ // changed this->primitive_base_t::load(t); } //------------------------------------------------------------- portable_binary_iarchive.cpp void portable_binary_iarchive::load_impl(boost::intmax_t & l, char maxsize){ signed char size; // changed l = 0; this->primitive_base_t::load(size); if(0 == size){ return; } bool negative = (size < 0); ...... // ----------------------------------------------------------------- portable_binary_oarchive.hpp void save(const signed char & t){ // changed this->primitive_base_t::save(t); } // ----------------------------------------------------------- portable_binary_oarchive.cpp void portable_binary_oarchive::save_impl( const boost::intmax_t l, const char maxsize ){ signed char size = 0; // changed if(l == 0){ this->primitive_base_t::save(size); return; } .......... // ------------------------------ Ta, Avi

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[property_tree] Population and Json formatting
by Michael Powell 20 Jun '13

20 Jun '13

Hello, Question about property tree. I've got an "event" concept which I want to serialize to Json through property tree. If I go something like this: ptree tree; tree.set<int>("event.id", 1); Then the resulting Json would look something like this? { "event": { "id": 1 } } or possibly? { "event": { "id" : "1" } } or possibly, with pretty turned off (nicer for message framing). {"event":{"id":"1"}} Thank you... Regards, Michael Powell

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Boost and Norton 360
by Scott Alexander 20 Jun '13

20 Jun '13

Hi, I have just installed boost 1.53 32bit using the Sourceforge Visual Studio installer and my security software (Norton 360) has quarantined three files as being high risk: *boost_math_tr1f-vc110-mt-1_53.dll *boost_thread-vc110-mt-gd-1_53.dll *boost_filesystem-vc110-mt-gd-1_53.dll Does anyone know if this is common? Can I safely restore these files? Thanks, Scott

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errors in boost build - 1.5.3 on Linux Mint 15 (Olivia) 64-bit
by asif saeed 20 Jun '13

20 Jun '13

Hi, I am trying to build boost 1.53 using GCC and have got the following errors: ...failed updating 348 targets... ...skipped 72 targets... ...updated 4568 targets... The "failed updating 348 targets..." shows that something has definitely gone wrong. Can any kind soul tell me what has happened? I used the following command after bootstrap: ./b2 --prefix=./ --build-type=complete --stagedir=./stage --layout=versioned --toolset=gcc Help me please. -Best regards, -Asif

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[program_options] Custom Validation for a String Value
by Ryan 19 Jun '13

19 Jun '13

Hello, Is there a way of validating a string type program option before it's stored in the map? add_options() ("arg" , value<std::string>()->default_value("Hi"), "Greeting"); boost::regex pattern("^(Hello | Good Morning | Hi)$"); I've used custom validation for types that program options doesn't recognize. I'd like to check the string before it's stored in the map like the custom validation does for unknown types. I'd rather the error be caught early. Is there a way to use the regex against the program option? Ryan

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Mutex synchronised wrapper class for boost::interprocess shared memory vector of strings
by Riskybiz 19 Jun '13

19 Jun '13

I'm trying to write a wrapper class in C++ to give mutex synchronised interprocess access to a shared memory vector of strings. This is my first foray into boost::interprocess and allocators are proving something of a mystery. Is anyone able to see why on compilation I get the error: error C2512: 'boost::interprocess::allocator::allocator' : no appropriate default constructor available C:\Program Files (x86)\Boost\boost_1_53_0\boost\container\string.hpp #ifndef SHARED_MEMORY_WRAPPER_H//if not defined already #define SHARED_MEMORY_WRAPPER_H//then define it #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/containers/vector.hpp> #include <boost/interprocess/containers/string.hpp> #include <boost/interprocess/allocators/allocator.hpp> #include <boost/interprocess/sync/named_mutex.hpp> using namespace boost::interprocess; class SharedMemoryWrapper { public: SharedMemoryWrapper(const std::string &name, bool server) : m_name(name), m_server(server) { if (server) { named_mutex::remove("named_mutex"); shared_memory_object::remove(m_name.c_str()); //Create shared memory managed_shared_memory m_segment(create_only, m_name.c_str(), 10000); //Create allocators CharAllocator charallocator(m_segment.get_segment_manager()); StringAllocator stringallocator(m_segment.get_segment_manager()); //This string is in only in this process (the pointer pointing to the //buffer that will hold the text is not in shared memory). //But the buffer that will hold "this is my text" is allocated from //shared memory MyShmString mystring(charallocator); mystring = "this is my text"; //This vector is fully constructed in shared memory. All pointers //buffers are constructed in the same shared memory segment //This vector can be safely accessed from other processes. MyShmStringVector *sharedSegmentVector = m_segment.construct<MyShmStringVector>("sharedSegmentVector")(stringallocato r); sharedSegmentVector->push_back(mystring); } else { //Open the shared segment managed_shared_memory m_segment(open_only, name.c_str()); //Find the vector using the c-string name and open it MyShmStringVector *sharedSegmentVector = m_segment.find<MyShmStringVector>("sharedSegmentVector").first; } m_mutex = new named_mutex(open_or_create, "named_mutex"); } ~SharedMemoryWrapper() { if (m_server) { named_mutex::remove("named_mutex"); //Destroy the vector from the managed_shared_memory m_segment->destroy_ptr(sharedSegmentVector);//This will free all strings that the vector contains m_segment->destroy<MyShmStringVector>("sharedSegmentVector");//Destroy the vector //Is it necessary to destroy the allocators here? //Remove the managed_shared_memory; this may fail if the memory does not exist or is mapped or opened by another process shared_memory_object::remove(m_name.c_str()); } delete m_mutex; delete m_segment; } //Writer void push(const std::string & in) { scoped_lock<named_mutex> lock(*m_mutex); MyShmString inStr = in.c_str(); sharedSegmentVector->push_back(inStr); } //Reader function yet to be coded. Needs to return a vector containing a subset range of elements from the shared-memory-vector. private: //Typedefs typedef boost::interprocess::allocator<char, managed_shared_memory::segment_manager> CharAllocator; typedef boost::interprocess::basic_string<char, std::char_traits<char>, CharAllocator> MyShmString; typedef boost::interprocess::allocator<MyShmString, managed_shared_memory::segment_manager> StringAllocator; typedef boost::interprocess::vector<MyShmString, StringAllocator> MyShmStringVector; bool m_server; std::string m_name; managed_shared_memory *m_segment; MyShmStringVector *sharedSegmentVector; named_mutex *m_mutex; };//class #endif//header guard With thanks, Riskybiz

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[statechart] [spirit] OSI delimited message framing
by Michael Powell 19 Jun '13

19 Jun '13

Hello, I need to design a delimited message framing for TCP/IP sockets, probably using Asio to facilitate transport. Then build an OSI layer 7 application vernier to handle framing. I've dabbled a bit with Spirit and cooked up a couple of "simple" micro grammars throughout the code base. In a sense, I could see a delimited message framing strategy being a grammar of sorts, but this seems somewhat complex for a grammar to handle when you consider the overhead of verifying pass/fail (message or not a message), plus extracting the message within the delimiters. Or, more likely approach the problem with statechart in mind. I've dealt with framed messages in the past more like this. One state is the escape byte, which can be followed by SOM, EOM, or another true-escape-byte (intended message byte). Plus other fields like message type, sub-type, how to handle payload, arguments, and so forth. Anyone else dealt with things like this before? With Spirit? With Statechart? Regards, Michael Powell

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Re: [Boost-users] Boost-users Digest, Vol 3479, Issue 1
by Damien Kick 19 Jun '13

19 Jun '13

Date: Mon, 17 Jun 2013 23:03:16 +0000 (UTC) From: legalize+jeeves(a)mail.xmission.com<mailto:legalize+jeeves@mail.xmission.com> (Richard) To: boost-users(a)lists.boost.org<mailto:boost-users@lists.boost.org> Subject: Re: [Boost-users] [Test]: Problem with simple Boost.Test Message-ID: <kpo4jk$2ih$2(a)ger.gmane.org<mailto:kpo4jk$2ih$2@ger.gmane.org>> [Please do not mail me a copy of your followup] boost-users(a)lists.boost.org<mailto:boost-users@lists.boost.org> spake the secret code <7364AB234369D348AE1CEBC1A86132DBAD32EA(a)SVLITMX02.shoretel.com<http://SVLITMX02.shoretel.com>> thusly: $ ${CXX} -c --std=c++0x -g -I${TARGET}/include cma.cpp -o cma.o $ ${CXX} --std=c++0x -g cma.o ${TARGET}/lib/libboost_test_exec_monitor.a \ ${TARGET}/lib/libboost_unit_test_framework.dylib -o cma Why are you linking against boost_test_exec_monitor? I've never needed to do that. boost_unit_test_framework should be enough. Interesting. Because I'm finding the following: $ ${CXX} -c --std=c++0x -g -I${TARGET}/include cma.cpp -o cma.o $ ${CXX} --std=c++0x -g cma.o ${TARGET}/lib/libboost_unit_test_framework.dylib -o cma Undefined symbols for architecture x86_64: "_main", referenced from: implicit entry/start for main executable ld: symbol(s) not found for architecture x86_64 collect2: error: ld returned 1 exit status $ But that is also what I'm finding with the system GCC and the Fink install of Boost 1.46, and so that behavior isn't unique my attempt to build/use a Boost with GCC 4.8.0 using --std=c++0x. $ g++ -c -g -I/sw/include cma.cpp -o cma.o $ g++ -g -L/sw/lib cma.o -lboost_unit_test_framework-mt Undefined symbols for architecture x86_64: "_main", referenced from: start in crt1.10.6.o ld: symbol(s) not found for architecture x86_64 collect2: ld returned 1 exit status $ g++ --version i686-apple-darwin11-llvm-g++-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00) Copyright (C) 2007 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $ fink list --tab boost1.46 Information about 7237 packages read in 1 seconds. i boost1.46.1.cmake 1.46.1-2 Boost C++ Libraries i boost1.46.1.cmake-shlibs 1.46.1-2 Boost C++ Libraries $ ________________________________ This e-mail and any attachments are confidential. If it is not intended for you, please notify the sender, and please erase and ignore the contents.

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[asio] Serial and TCP I/O
by Michael Powell 19 Jun '13

19 Jun '13

Hello, I have an application that I'd like to leverage some common code if at all possible (and/or necessary), using concepts of client/server, reader/writer, and so on. Probably also TCP/IP and/or Serial, although I gather Asio has a serial class ready to go out of the box? Serial is pretty much a "no brainer", can be a server, but to talk to devices in our use case, always the client, can be either reader or writer or both. The key question here is, do we need a separate io_service for serial as well as for TCP? Regards, Michael Powell

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