- Boost-users - lists.boost.org

Re: [Boost-users] Unable to catch exception using boost::asio
by Alex Black 15 Jul '09

15 Jul '09

>> I'm using boost::asio for sockets, writing a response out to a client. >> >> If the client stops part way through getting the response, then my >> server process dies: >> >> terminate called after throwing an instance of >> 'boost::exception_detail::clone_impl<boost::exception_detail::error_in >> fo_injector<boost::system::system_error> >>>' >> ? what():? Broken pipe >> >> The code though is surrounded by try catch like this: >> >> try >> { >> ??? ... >> } >> catch ( std::exception& e ) >> { >> ??? cout << e.what() << endl; >> } >> catch ( ... ) >> { >> ???? cout << "unexpected exception" << endl; } >> >> How do I prevent my process from aborting/terminating like this? v >Have you verified that the code inside the try block executes on the same thread that the exception is occuring in? Not explicitly, how would I do that? thx - Alex

2 2

[mpl] BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF
by Hicham Mouline 15 Jul '09

15 Jul '09

#include <iostream> #include <boost/mpl/has_xxx.hpp> #include <boost/mpl/bool.hpp> BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(has_xxx, xxx, false) struct test1 { int xxx; }; using namespace boost::mpl; int main() { std::cout<< has_xxx<test1>::value <<std::endl; return 0; } The output is 0, while it should be 1, shouldn't it? Rds,

2 1

Re: [Boost-users] Unable to catch exception using boost::asio
by Alex Black 15 Jul '09

15 Jul '09

>> The code though is surrounded by try catch like this: >> >> try >> { >> ??? ... >> } > What code resides in the protected block? Do you run io_service in multiple threads? What exception-related compiler options do you use? I do call io_service.run, on a thread on startup. I call async_accept, and accept connections one at a time. So basically I a my accept_handler gets called, I enter the try, then its just business logic and writing results out onto a socket. Exception-related compiler options? Not sure. This is happening in debug (and release). In release I have march=native and O-O3 set.

1 0

Unable to catch exception using boost::asio (boost::exception_detail::clone_imple<.....
by Alex Black 14 Jul '09

14 Jul '09

I'm using boost::asio for sockets, writing a response out to a client. If the client stops part way through getting the response, then my server process dies: terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info _injector<boost::system::system_error> >' what(): Broken pipe The code though is surrounded by try catch like this: try { ... } catch ( std::exception& e ) { cout << e.what() << endl; } catch ( ... ) { cout << "unexpected exception" << endl; } How do I prevent my process from aborting/terminating like this? thx - Alex

3 2

[statechart] friend state can't call overloaded member functions in machine class
by David Matz 14 Jul '09

14 Jul '09

Hi, if one want to centralize all transition callbacks into the machine itself it's a good way to declare the states as friends and call the machine member functions which should (of course) private. But boost::statechart has problems if the member functions in the machine class are overloaded. Then the friend declaration is ignored by the compiler. Here is a snippet to reproduce the error: struct Active; class CoreApp : public boost::statechart::state_machine< CoreApp, Active > { friend struct Active; public: CoreApp() { initiate(); } private: void doInStateReaction(const EvNext &) {} void doInStateReaction(const EvBack &) {} ///< uncomment this line to resolve the error }; struct Active : boost::statechart::simple_state< Active, CoreApp > { typedef boost::mpl::list < //sc::in_state_reaction < EvBack, CoreApp, &CoreApp::doInStateReaction >, sc::in_state_reaction < EvNext, CoreApp, &CoreApp::doInStateReaction > > reactions; }; As one can see two functions doInStateReaction() are defined in the state machine class. Comment the second one out and it compiles. This problem occurs too if one uses a templated event which calls a templated function. A easy solution to this problem is to rename the functions slightly but I hope there is a better way. Has anyone an idea to catch this? David

2 1

Tokenizer design question
by Polder, Matthew J 14 Jul '09

14 Jul '09

The Tokenizer library has a char_separator with the option to keep delimiters, drop delimiters, and keep or drop empty tokens. However, with escaped_list_separator, the only behavior is to keep empty tokens. While this is the obvious behavior for parsing csv and similar files, it would be nice to have the ability to also drop empty tokens when constructing an escaped_list_separator. I have a command line parser that either reads its arguments from the command line itself or a text file supplied on the command line. In the file I'm passing in formats for the Date Time library I/O routines, and the formats have spaces that I'm escaping so the format will be a single token, which Tokenizer does find. But I sometimes use multiple tabs to separate my fields so it will look pretty in a text editor, and escaped_list_separator is keeping these. The solution for now is to have a switch in my command line parser for which separator I want to use. thanks, matthew

2 1

A linking error on switch_statement. Can anyone with kindness help me?
by fmingu 14 Jul '09

14 Jul '09

I am using Dev-C++ with boost 1.34.1,the program is the following: ....................... typedef std::map<int, int> IIPrimemap; IIPrimemap primemapvec; # define BetaKGre2 1 # define EqualToOne 2 #define ProductOfKPrime 3 ......................... (switch_statement(_1, case_statement<BetaKGre2> (var(result)=0), case_statement<EqualToOne> (var(result)=1), case_statement<ProductOfKPrime> (var(result)=bind(static_cast<long double (*)(long double,int)>(std::pow), constant(-1.0),bind(&IIPrimemap::size,var(primemapvec)))), default_statement ( var(result)=234) ))(switchvalue); the complier told me no errors.But the linker told me that: nstantiated from `Arg::sig<boost::tuples::tuple<A&, B&, C&, Env&, boost::tuples::null_type, boost::tuples::null_type, boost......... instantiated from `RET boost::lambda::lambda_functor_base<boost::lambda::s................ nstantiated from `T::sig<boost::tuples::tuple<A&, boost::tuples::null_type, boost::tuples::null_type, bo........... instantiated from here..........// indicating the line: ))(switchvalue); And after the second compling and linking , the program passed and ran. I do not know why. And this was caused after I added the line: (var(result)=bind(static_cast<long double (*)(long double,int)>(std::pow), constant(-1.0),bind(&IIPrimemap::size,var(primemapvec)))), otherwise the program do not have such problems. How can I solve it? Can anyone with kindness help me?

2 1

Boost tokenizer does not work, and shows up invalid read of size on valgrind
by Avi Bahra 14 Jul '09

14 Jul '09

Using latest boost version 39 on gcc 4.2.1 on SUSE linux I am trying to load a file, and then split the lines into a vector of strings. However when this is run, it showed that the last string was corrupt. When I ran this with valgrind, the very first error shows an invalid read of size 1, in guts of boost::char_separator. ==19963== Invalid read of size 1 ==19963== at 0x8056870: bool boost::char_separator<char, std::char_traits<char> >::operator()<__gnu_cxx::__normal_iterator<char const*, std::string>, std::string>(__gnu_cxx::__normal_iterator<char const*, std::string>&, __gnu_cxx::__normal_iterator<char const*, std::string>, std::string&) (token_functions.hpp:430) ==19963== by 0x8056E3E: boost::token_iterator<boost::char_separator<char, std::char_traits<char> >, __gnu_cxx::__normal_iterator<char const*, std::string>, std::string>::initialize() (token_iterator.hpp:70) ==19963== by 0x8056EA6: boost::token_iterator<boost::char_separator<char, std::char_traits<char> >, __gnu_cxx::__normal_iterator<char const*, std::string>, std::string>::token_iterator(boost::char_separator<char, std::char_traits<char> >, __gnu_cxx::__normal_iterator<char const*, std::string>, __gnu_cxx::__normal_iterator<char const*, std::string>) (token_iterator.hpp:77) ==19963== by 0x8056FAA: boost::tokenizer<boost::char_separator<char, std::char_traits<char> >, __gnu_cxx::__normal_iterator<char const*, std::string>, std::string>::begin() const (tokenizer.hpp:86) here is program: BOOST_AUTO_TEST_CASE( test_log_append ) { string logFile = "test/logfile.txt"; // Load the log file into a vector, of strings, and test content ifstream ifs(logFile.c_str()); BOOST_REQUIRE_MESSAGE(ifs, "Could not open log file\n"); stringstream ss; ss << ifs.rdbuf(); // Read the whole file into a string char_separator<char> sep("\n"); // Split the file content unix=\n pc =\n\r typedef boost::tokenizer<boost::char_separator<char> > tokenizer; tokenizer tokens(ss.str(), sep); // <<<<<<<< valgrind barfs here std::vector<std::string> lines; lines.reserve(9); std::copy(tokens.begin(), tokens.end(), back_inserter(lines)); // <<<<<<<< valgrind barfs here for(int i = 0; i < lines.size(); i++) { cerr << "'" << lines[i] << "'\n"; } } the input in the logfile.txt is of the form: MSG:[16:36:09 14.7.2009] First Message LOG:[16:36:09 14.7.2009] LOG WAR:[16:36:09 14.7.2009] ERROR ERR:[16:36:09 14.7.2009] WARNING DBG:[16:36:09 14.7.2009] DEBUG OTH:[16:36:09 14.7.2009] OTHER OTH:[16:36:09 14.7.2009] OTHER2 MSG:[16:36:09 14.7.2009] Last Message The output is of the form: 'MSG:[16:36:09 14.7.2009] First Message' 'LOG:[16:36:09 14.7.2009] LOG' 'WAR:[16:36:09 14.7.2009] ERROR' 'ERR:[16:36:09 14.7.2009] WARNING' 'DBG:[16:36:09 14.7.2009] DEBUG' 'OTH:[16:36:09 14.7.2009] OTHER' 'OTH:[16:36:09 14.7.2009] OTHER2' '�:[16:36:09 14.7.2009] Last Message' Notice that the last string is corrupt. Is the tokenizer known to be buggy in boost 1.39, or am I doing it all wrong ? Best regards, Ta, Avi

2 1

filesystem filename/regexp pattern matching, fnmatch
by Mark Lohry 14 Jul '09

14 Jul '09

I'm porting some linux software to Windows/MSYS, and I've run into a number of linux-specific file system routines that I was hoping boost::filesystem would be able to render portable, specifically "glob" and "fnmatch". As for glob, I came across this thread: http://article.gmane.org/gmane.comp.lib.boost.user/5198/match=glob but it appears to not have been implemented into boost, and the link to source code is long dead. Am I going to need to just re-write all glob-specific code into something boost::filesystem compatible? As for fnmatch(), which matches regular expressions in strings (say, finding all files in a directory which contain a numeral), does this not exist in the filesystem library, or am I overlooking something? Sorry for the novice nature of the question, but my Boost experience is limited to numerics. -ML

1 0

regex traits for glib::ustring
by Simon Wibberley 14 Jul '09

14 Jul '09

Hi there, I'm attempting to build an application which requires multibyte character support, for which I'm using the Glib::ustring, and needs also to use regex. From what I understand you need to tell boost regex exactly how to iterate over your strings. I've got as far as: typedef boost::match_results<Glib::ustring::iterator, std::allocator<gunichar> > umatch; typedef boost::reg_expression<Glib::ustring, boost::regex_traits<Glib::ustring> > uregex; //making the regex_match<ustring::iterator, std::allocator<gunichar>, ustring, regex_traits<ustring> >(str.begin(), str.end(), m, re); //where str is a ustring, re is a uregex and m is a umatch as defined above However I get the feeling I'm completely missing a trick, ie that's it's a lot more complex than this... I'm using boost 1.39 and glibmm 2.4. Could anyone provide any guidance on this, whether it's even possible without writing a lot of code, or possible alternatives? Many thanks, Simon

2 1