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• Unable to sync time using `ntpdate`, error: "no server suitable for synchronization found"

  - by William Ting

  My ntp.conf file: user@pc[0][07:37:40]:/etc$ cat /etc/ntp.conf idriftfile /var/lib/ntp/ntp.drift server 0.pool.ntp.org server 1.pool.ntp.org server 2.pool.ntp.org server pool.ntp.org Command output: user@pc[0][07:37:24]:/etc$ sudo ntpdate -dv pool.ntp.org 18 Jun 07:37:35 ntpdate[10737]: ntpdate [email protected] Tue Apr 19 07:15:05 UTC 2011 (1) Looking for host pool.ntp.org and service ntp host found : conquest.kjsl.com transmit(198.137.202.16) transmit(216.45.57.38) transmit(64.6.144.6) transmit(198.137.202.16) transmit(216.45.57.38) transmit(64.6.144.6) transmit(198.137.202.16) transmit(216.45.57.38) transmit(64.6.144.6) transmit(198.137.202.16) transmit(216.45.57.38) transmit(64.6.144.6) transmit(198.137.202.16) transmit(216.45.57.38) transmit(64.6.144.6) 198.137.202.16: Server dropped: no data 216.45.57.38: Server dropped: no data 64.6.144.6: Server dropped: no data server 198.137.202.16, port 123 stratum 0, precision 0, leap 00, trust 000 refid [198.137.202.16], delay 0.00000, dispersion 64.00000 transmitted 4, in filter 4 reference time: 00000000.00000000 Thu, Feb 7 2036 0:28:16.000 originate timestamp: 00000000.00000000 Thu, Feb 7 2036 0:28:16.000 transmit timestamp: d1a71a93.1f16c1e3 Sat, Jun 18 2011 7:37:39.121 filter delay: 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 filter offset: 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 delay 0.00000, dispersion 64.00000 offset 0.000000 server 216.45.57.38, port 123 stratum 0, precision 0, leap 00, trust 000 refid [216.45.57.38], delay 0.00000, dispersion 64.00000 transmitted 4, in filter 4 reference time: 00000000.00000000 Thu, Feb 7 2036 0:28:16.000 originate timestamp: 00000000.00000000 Thu, Feb 7 2036 0:28:16.000 transmit timestamp: d1a71a93.524a05dd Sat, Jun 18 2011 7:37:39.321 filter delay: 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 filter offset: 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 delay 0.00000, dispersion 64.00000 offset 0.000000 server 64.6.144.6, port 123 stratum 0, precision 0, leap 00, trust 000 refid [64.6.144.6], delay 0.00000, dispersion 64.00000 transmitted 4, in filter 4 reference time: 00000000.00000000 Thu, Feb 7 2036 0:28:16.000 transmitted 4, in filter 4 reference time: 00000000.00000000 Thu, Feb 7 2036 0:28:16.000 originate timestamp: 00000000.00000000 Thu, Feb 7 2036 0:28:16.000 transmit timestamp: d1a71a93.524a05dd Sat, Jun 18 2011 7:37:39.321 filter delay: 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 filter offset: 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 delay 0.00000, dispersion 64.00000 offset 0.000000 server 64.6.144.6, port 123 stratum 0, precision 0, leap 00, trust 000 refid [64.6.144.6], delay 0.00000, dispersion 64.00000 transmitted 4, in filter 4 reference time: 00000000.00000000 Thu, Feb 7 2036 0:28:16.000 originate timestamp: 00000000.00000000 Thu, Feb 7 2036 0:28:16.000 transmit timestamp: d1a71a93.857c6fbd Sat, Jun 18 2011 7:37:39.521 filter delay: 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 filter offset: 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 delay 0.00000, dispersion 64.00000 offset 0.000000 18 Jun 07:37:40 ntpdate[10737]: no server suitable for synchronization found

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• Javascript Date object expression (Date within date)

  - by webzide

  Dear experts, I was analyzing Javascript codes and came across this line: var date = (new Date()).getDate(); This kinda throw me off? I am pretty new to Javascript and a little curious.

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• Problem with combination boost::exception and boost::variant

  - by Rick

  Hello all, I have strange problem with two-level variant struct when boost::exception is included. I have following code snippet: #include <boost/variant.hpp> #include <boost/exception/all.hpp> typedef boost::variant< int > StoredValue; typedef boost::variant< StoredValue > ExpressionItem; inline std::ostream& operator << ( std::ostream & os, const StoredValue& stvalue ) { return os;} inline std::ostream& operator << ( std::ostream & os, const ExpressionItem& stvalue ) { return os; } When I try to compile it, I have following error: boost/exception/detail/is_output_streamable.hpp(45): error C2593: 'operator <<' is ambiguous test.cpp(11): could be 'std::ostream &operator <<(std::ostream &,const ExpressionItem &)' [found using argument-dependent lookup] test.cpp(8): or 'std::ostream &operator <<(std::ostream &,const StoredValue &)' [found using argument-dependent lookup] 1> while trying to match the argument list '(std::basic_ostream<_Elem,_Traits>, const boost::error_info<Tag,T>)' 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char> 1> ] 1> and 1> [ 1> Tag=boost::tag_original_exception_type, 1> T=const type_info * 1> ] Code snippet is simplified as much as possible, in the real code are structures much more complicated and each variant has five sub-types. When i remove #include and try following test snippet, program is compiled correctly: void TestVariant() { ExpressionItem test; std::stringstream str; str << test; } Could someone please advise me how to define operators << in order to function even when using boost::Exception ? Thanks and regards Rick

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• Grabbing rows from MySql where current date is in between start date and end date (Check if current date lies between start date and end date)

  - by Jordan Parker

  I'm trying to select from the database to get the "campaigns" that dates fall into the month. So far i've been successful in grabbing rows that starts or ends inside the current month. What I need to do now is select rows that start in one month and ends a few months down the line ( EG: It's the 3rd month in the year, and there's a "campaign" that runs from the 1st month until the 5th. other example There is a "campaign" that runs from 2012 until 2013 ) I'm hoping there is some way to select via MySql all rows in which a capaign may run. If not should I grab all data in the database and only show the ones that run via the current month. I have already made a function that displays all the days inbetween each date inside an array, which is called "dateRange". I've also created another which shows how many days the campaign runs for called "runTime". Select all (Obviously) $result = mysql_query("SELECT * FROM campaign"); Select Starting This Month $result = mysql_query("SELECT * FROM campaign WHERE YEAR( START ) = YEAR( CURDATE( ) ) AND MONTH( START ) = MONTH( CURDATE( ) )"); Select Ending This Month $result = mysql_query("SELECT * FROM campaign WHERE YEAR( END ) = YEAR( CURDATE( ) ) AND MONTH( END ) = MONTH( CURDATE( ) ) LIMIT 0 , 30"); Code sample while($row = mysql_fetch_array($result)) { $dateArray = dateRange($row['start'], $row['end']); echo "<h3>" . $row['campname'] . "</h3> Start " . $row['start'] . "<br /> End " . $row['end']; echo runTime($row['start'], $row['end']); print_r($dateArray); } In regards to the dates, MySql database only holds start date and end date of the campaign.

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• C++ boost::lambda::ret equivalent in phoenix

  - by aaa

  hello. Boost lambda allows to overwrite deduced return type using ret<T> template. I have tried searching for equivalent in phoenix but could not find one. Is there an equivalent in phoenix? I know how to make my own Replacement but I would rather not. thank you

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• Problem in running boost eample blocking_udp_echo_client on MacOSX

  - by n179911

  I am trying to run blocking_udp_echo_client on MacOS X http://www.boost.org/doc/libs/1_35_0/doc/html/boost_asio/example/echo/blocking_udp_echo_client.cpp I run it with argument 'localhost 9000' But the program crashes and this is the line in the source which crashes: `udp::socket s(io_service, udp::endpoint(udp::v4(), 0));' this is the stack trace: #0 0x918c3e42 in __kill #1 0x918c3e34 in kill$UNIX2003 #2 0x9193623a in raise #3 0x91942679 in abort #4 0x940d96f9 in __gnu_debug::_Error_formatter::_M_error #5 0x0000e76e in __gnu_debug::_Safe_iterator::op_base* , __gnu_debug_def::list::op_base*, std::allocator::op_base* ::_Safe_iterator at safe_iterator.h:124 #6 0x00014729 in boost::asio::detail::hash_map::op_base*::bucket_type::bucket_type at hash_map.hpp:277 #7 0x00019e97 in std::_Construct::op_base*::bucket_type, boost::asio::detail::hash_map::op_base*::bucket_type at stl_construct.h:81 #8 0x0001a457 in std::__uninitialized_fill_n_aux::op_base*::bucket_type*, __gnu_norm::vector::op_base*::bucket_type, std::allocator::op_base*::bucket_type , unsigned long, boost::asio::detail::hash_map::op_base*::bucket_type at stl_uninitialized.h:194 #9 0x0001a4e1 in std::uninitialized_fill_n::op_base*::bucket_type*, __gnu_norm::vector::op_base*::bucket_type, std::allocator::op_base*::bucket_type , unsigned long, boost::asio::detail::hash_map::op_base*::bucket_type at stl_uninitialized.h:218 #10 0x0001a509 in std::__uninitialized_fill_n_a::op_base*::bucket_type*, __gnu_norm::vector::op_base*::bucket_type, std::allocator::op_base*::bucket_type , unsigned long, boost::asio::detail::hash_map::op_base*::bucket_type, boost::asio::detail::hash_map::op_base*::bucket_type at stl_uninitialized.h:310 #11 0x0001aa34 in __gnu_norm::vector::op_base*::bucket_type, std::allocator::op_base*::bucket_type ::_M_fill_insert at vector.tcc:365 #12 0x0001acda in __gnu_norm::vector::op_base*::bucket_type, std::allocator::op_base*::bucket_type ::insert at stl_vector.h:658 #13 0x0001ad81 in __gnu_norm::vector::op_base*::bucket_type, std::allocator::op_base*::bucket_type ::resize at stl_vector.h:427 #14 0x0001ae3a in __gnu_debug_def::vector::op_base*::bucket_type, std::allocator::op_base*::bucket_type ::resize at vector:169 #15 0x0001b7be in boost::asio::detail::hash_map::op_base*::rehash at hash_map.hpp:221 #16 0x0001bbeb in boost::asio::detail::hash_map::op_base*::hash_map at hash_map.hpp:67 #17 0x0001bc74 in boost::asio::detail::reactor_op_queue::reactor_op_queue at reactor_op_queue.hpp:42 #18 0x0001bd24 in boost::asio::detail::kqueue_reactor::kqueue_reactor at kqueue_reactor.hpp:86 #19 0x0001c000 in boost::asio::detail::service_registry::use_service at service_registry.hpp:109 #20 0x0001c14d in boost::asio::use_service at io_service.ipp:195 #21 0x0001c26d in boost::asio::detail::reactive_socket_service ::reactive_socket_service at reactive_socket_service.hpp:111 #22 0x0001c344 in boost::asio::detail::service_registry::use_service at service_registry.hpp:109 #23 0x0001c491 in boost::asio::use_service at io_service.ipp:195 #24 0x0001c4d5 in boost::asio::datagram_socket_service::datagram_socket_service at datagram_socket_service.hpp:95 #25 0x0001c59e in boost::asio::detail::service_registry::use_service at service_registry.hpp:109 #26 0x0001c6eb in boost::asio::use_service at io_service.ipp:195 #27 0x0001c711 in boost::asio::basic_io_object ::basic_io_object at basic_io_object.hpp:72 #28 0x0001c783 in boost::asio::basic_socket ::basic_socket at basic_socket.hpp:108 #29 0x0001c865 in boost::asio::basic_datagram_socket ::basic_datagram_socket at basic_datagram_socket.hpp:107 #30 0x000027bc in main at main.cpp:32 This is the gdb output: (gdb) continue /Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/debug/safe_iterator.h:127: error: attempt to copy-construct an iterator from a singular iterator. Objects involved in the operation: iterator "this" @ 0x0x100420 { type = N11__gnu_debug14_Safe_iteratorIN10__gnu_norm14_List_iteratorISt4pairIiPN5boost4asio6detail16reactor_op_queueIiE7op_baseEEEEN15__gnu_debug_def4listISB_SaISB_EEEEE (mutable iterator); state = singular; } iterator "other" @ 0x0xbfffe8a4 { type = N11__gnu_debug14_Safe_iteratorIN10__gnu_norm14_List_iteratorISt4pairIiPN5boost4asio6detail16reactor_op_queueIiE7op_baseEEEEN15__gnu_debug_def4listISB_SaISB_EEEEE (mutable iterator); state = singular; } Program received signal: “SIGABRT”. (gdb) continue Program received signal: “?”. Does someone has any idea why this example does not work on mac osx? Thank you.

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• Most pain-free time registration software for developers ?

  - by driis

  I work as a consultant in a medium-sized firm. We need to keep track of time spent on individual tasks and which customers to bill to. Our current system for doing this is an old in-house system, that needs to be retired for various reasons. Most developers don't like registering time, so I am looking for the best tool for this job, that minimizes the time needed to register time. Must have features: Must be simple and easy to use. Must have reporting feature to use for billing. Must have an API, so we can integrate in-house tools. Registering time should be based on hours worked (ie. today, worked on Customer A, Task B from 8 AM to 12 AM). TFS integration is a plus, but not needed (ie. register time on a work item) May be open source or a paid product; doesn't really matter. What would you recommend ?

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• Intellisense fails for boost::shared_ptr with Boost 1.40.0 in Visual Studio 2008

  - by Edward Loper

  I'm having trouble getting intellisense to auto-complete shared pointers for boost 1.40.0. (It works fine for Boost 1.33.1.) Here's a simple sample project file where auto-complete does not work: #include <boost/shared_ptr.hpp> struct foo { bool func() { return true; }; }; void bar() { boost::shared_ptr<foo> pfoo; pfoo.get(); // <-- intellisense does not autocomplete after "pfoo." pfoo->func(); // <-- intellisense does not autocomplete after "pfoo->" } When I right-click on shared_ptr, and do "Go to Definition," it brings be to a forward-declaration of the shared_ptr class in . It does not bring me to the actual definition, which is in However, it compiles fine, and auto-completion works fine for "boost::." Also, auto-completion works fine for boost::scoped_ptr and for boost::shared_array. Any ideas?

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• how to get this working if exist tasklist=="notepad %DATE%.txt" [closed]

  - by blade19899

  @echo off title Log file creator if exist "%CD%\%DATE%.txt" (msg * "the log of today(%DATE%.txt) Has already been made" goto :notepad) else (goto :start) goto :eof :start echo %date%>>"%date%".txt echo %username% >>"%date%".txt echo.>>"%date%".txt echo.>>"%date%".txt echo ----------------------------------------Reports---------------------------------------- >>"%date%".txt echo.>>"%date%".txt echo.>>"%date%".txt echo.>>"%date%".txt echo.>>"%date%".txt echo.>>"%date%".txt echo.>>"%date%".txt echo.>>"%date%".txt echo.>>"%date%".txt echo ----------------------------------------TO-DO---------------------- >>"%date%".txt echo.>>"%date%".txt echo.>>"%date%".txt :notepad if exist tasklist=="notepad %DATE%.txt" (msg * "the log of today(%DATE%.txt) Has already been made, en is opened") else (goto :start) goto :eof :start start notepad %DATE%.txt This code right now pops up the log of today(%DATE%.txt) Has already been made and after clicking OK it doesn't do anything it should open the msg the log of today(%DATE%.txt) Has already been made, en is opened i have notepad opened. with process explorer it shows notepad and the date.txt my question is how to make it show the the log of today(%DATE%.txt) Has already been made, en is opened box... and perhaps bring notepad to the foreground? ps not sure if this question belongs here. Apologize if it doesn't!

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• Hard-copy approaches to time tracking

  - by STW

  I have a problem: I suck at tracking time-on-task for specific feature/defects/etc while coding them. I tend to jump between tasks a fair bit (partly due to the inherit juggling required by professional software development, partly due to my personal tendancy to focus on the code itself and not the business process around code). My personal preference is for a hard-copy system. Even with gabillions of pixels of real-estate on-screen I find it terribly distracting to keep a tracking window convienient; either I forget about it or it gets in my ways. So, looking for suggestions on time-tracking. My only requirement is a simple system to track start/stop times per task. I've considered going as far as buying a time-clock and giving each ticket a dedicated time-card. When I start working on it, punch-in; when done working, punch-out.

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• Unit testing time-bound code

  - by maasg

  I'm currently working on an application that does a lot of time-bound operations. That is, based on long now = System.currentTimeMillis();, and combined with an scheduler, it will calculate periods of time that parametrize the execution of some operations. e.g.: public void execute(...) { // executed by an scheduler each x minutes final int now = (int) TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis()); final int alignedTime = now - now % getFrequency() ; final int startTime = alignedTime - 2 * getFrequency(); final int endTimeSecs = alignedTime - getFrequency(); uploadData(target, startTime, endTimeSecs); } Most parts of the application are unit-tested independently of time (in this case, uploadData has a natural unit test), but I was wondering about best practices for testing time-bound parts that rely on System.currentTimeMillis() ?

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• boost::asio::async_write problem

  - by user368831

  Hi, I'm trying to figure out how asynchronous reads and writes work in boost asio by manipulating the echo example. Currently, I have a server that should, when sent a sentence, respond with only the first word. However, the boost::asio::async_write never seems to complete even though the write handler is being called. Can someone please explain what's going on? Here's the code: #include <cstdlib> #include <iostream> #include <boost/bind.hpp> #include <boost/asio.hpp> using boost::asio::ip::tcp; class session { public: session(boost::asio::io_service& io_service) : socket_(io_service) { } tcp::socket& socket() { return socket_; } void start() { std::cout<<"starting"<<std::endl; boost::asio::async_read_until(socket_, buffer, ' ', boost::bind(&session::handle_read, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } void handle_read(const boost::system::error_code& error, size_t bytes_transferred) { // std::ostringstream ss; // ss<<&buffer; char* c = new char[bytes_transferred]; //std::string s; buffer.sgetn(c,bytes_transferred); std::cout<<"data: "<< c<<" bytes: "<<bytes_transferred<<std::endl; if (!error) { boost::asio::async_write(socket_, boost::asio::buffer(c,bytes_transferred), boost::bind(&session::handle_write, this, boost::asio::placeholders::error)); } else { delete this; } } void handle_write(const boost::system::error_code& error) { std::cout<<"handling write"<<std::endl; if (!error) { } else { delete this; } } private: tcp::socket socket_; boost::asio::streambuf buffer; }; class server { public: server(boost::asio::io_service& io_service, short port) : io_service_(io_service), acceptor_(io_service, tcp::endpoint(tcp::v4(), port)) { session* new_session = new session(io_service_); acceptor_.async_accept(new_session->socket(), boost::bind(&server::handle_accept, this, new_session, boost::asio::placeholders::error)); } void handle_accept(session* new_session, const boost::system::error_code& error) { if (!error) { new_session->start(); new_session = new session(io_service_); acceptor_.async_accept(new_session->socket(), boost::bind(&server::handle_accept, this, new_session, boost::asio::placeholders::error)); } else { delete new_session; } } private: boost::asio::io_service& io_service_; tcp::acceptor acceptor_; }; int main(int argc, char* argv[]) { try { if (argc != 2) { std::cerr << "Usage: async_tcp_echo_server <port>\n"; return 1; } boost::asio::io_service io_service; using namespace std; // For atoi. server s(io_service, atoi(argv[1])); io_service.run(); } catch (std::exception& e) { std::cerr << "Exception: " << e.what() << "\n"; } return 0; } Thanks!

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• Is there any boost-independent version of boost/tr1 shared_ptr

  - by Artyom

  I'm looking for independent implementation of boost/tr1 shared_ptr, weak_ptr and enable_shared_from_this. I need: Boost independent very small implementation of these features. I need support of only modern compilers like GCC-4.x, MSVC-2008, Intel not things like MSVC6 or gcc-3.3 I need it to be licensed under non-copyleft LGPL compatible license like Boost/Mit/3-clause BSD. So I can include it in my library. Note - it is quite hard to extract shared_ptr from boost, at least BCP gives about 324 files...

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• Error with Phoenix placeholder _val in Boost.Spirit.Lex :(

  - by GooRoo

  Hello, everybody. I'm newbie in Boost.Spirit.Lex. Some strange error appears every time I try to use lex::_val in semantics actions in my simple lexer: #ifndef _TOKENS_H_ #define _TOKENS_H_ #include <iostream> #include <string> #include <boost/spirit/include/lex_lexertl.hpp> #include <boost/spirit/include/phoenix_operator.hpp> #include <boost/spirit/include/phoenix_statement.hpp> #include <boost/spirit/include/phoenix_container.hpp> namespace lex = boost::spirit::lex; namespace phx = boost::phoenix; enum tokenids { ID_IDENTIFICATOR = 1, ID_CONSTANT, ID_OPERATION, ID_BRACKET, ID_WHITESPACES }; template <typename Lexer> struct mega_tokens : lex::lexer<Lexer> { mega_tokens() : identifier(L"[a-zA-Z_][a-zA-Z0-9_]*", ID_IDENTIFICATOR) , constant (L"[0-9]+(\\.[0-9]+)?", ID_CONSTANT ) , operation (L"[\\+\\-\\*/]", ID_OPERATION ) , bracket (L"[\\(\\)\\[\\]]", ID_BRACKET ) { using lex::_tokenid; using lex::_val; using phx::val; this->self = operation [ std::wcout << val(L'<') << _tokenid // << val(L':') << lex::_val << val(L'>') ] | identifier [ std::wcout << val(L'<') << _tokenid << val(L':') << _val << val(L'>') ] | constant [ std::wcout << val(L'<') << _tokenid // << val(L':') << _val << val(L'>') ] | bracket [ std::wcout << phx::val(lex::_val) << val(L'<') << _tokenid // << val(L':') << lex::_val << val(L'>') ] ; } lex::token_def<wchar_t, wchar_t> operation; lex::token_def<std::wstring, wchar_t> identifier; lex::token_def<double, wchar_t> constant; lex::token_def<wchar_t, wchar_t> bracket; }; #endif // _TOKENS_H_ and #include <cstdlib> #include <iostream> #include <locale> #include <boost/spirit/include/lex_lexertl.hpp> #include "tokens.h" int main() { setlocale(LC_ALL, "Russian"); namespace lex = boost::spirit::lex; typedef std::wstring::iterator base_iterator; typedef lex::lexertl::token < base_iterator, boost::mpl::vector<wchar_t, std::wstring, double, wchar_t>, boost::mpl::true_ > token_type; typedef lex::lexertl::actor_lexer<token_type> lexer_type; typedef mega_tokens<lexer_type>::iterator_type iterator_type; mega_tokens<lexer_type> mega_lexer; std::wstring str = L"alfa+x1*(2.836-x2[i])"; base_iterator first = str.begin(); bool r = lex::tokenize(first, str.end(), mega_lexer); if (r) { std::wcout << L"Success" << std::endl; } else { std::wstring rest(first, str.end()); std::wcerr << L"Lexical analysis failed\n" << L"stopped at: \"" << rest << L"\"\n"; } return EXIT_SUCCESS; } This code causes an error in Boost header 'boost/spirit/home/lex/argument.hpp' on line 167 while compiling: return: can't convert 'const boost::variant' to 'boost::variant &' When I don't use lex::_val program compiles with no errors. Obviously, I use _val in wrong way, but I do not know how to do this correctly. Help, please! :) P.S. And sorry for my terrible English…

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• boost.asio error on read from socket.

  - by niXman

  The following code of the client: typedef boost::array<char, 10> header_packet; header_packet header; boost::system::error_code error; ... /** send header */ boost::asio::write( _socket, boost::asio::buffer(header, header.size()), boost::asio::transfer_all(), error ); /** send body */ boost::asio::write( _socket, boost::asio::buffer(buffer, buffer.length()), boost::asio::transfer_all(), error ); of the server: struct header { boost::uint32_t header_length; boost::uint32_t id; boost::uint32_t body_length; }; static header unpack_header(const header_packet& data) { header hdr; sscanf(data.data(), "%02d%04d%04d", &hdr.header_length, &hdr.id, &hdr.body_length); return hdr; } void connection::start() { boost::asio::async_read( _socket, boost::asio::buffer(_header, _header.size()), boost::bind( &connection::read_header_handler, shared_from_this(), boost::asio::placeholders::error ) ); } /***************************************************************************/ void connection::read_header_handler(const boost::system::error_code& e) { if ( !e ) { std::cout << "readed header: " << _header.c_array() << std::endl; std::cout << constants::unpack_header(_header); boost::asio::async_read( _socket, boost::asio::buffer(_body, constants::unpack_header(_header).body_length), boost::bind( &connection::read_body_handler, shared_from_this(), boost::asio::placeholders::error ) ); } else { /** report error */ std::cout << "read header finished with error: " << e.message() << std::endl; } } /***************************************************************************/ void connection::read_body_handler(const boost::system::error_code& e) { if ( !e ) { std::cout << "readed body: " << _body.c_array() << std::endl; start(); } else { /** report error */ std::cout << "read body finished with error: " << e.message() << std::endl; } } On the server side the method read_header_handler() is called, but the method read_body_handler() is never called. Though the client has written down the data in a socket. The header is readed and decoded successfully. What's the error?

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• boost scoped_lock mutex crashes

  - by JahSumbar

  hello, I have protected a std::queue's access functions, push, pop, size, with boost::mutexes and boost::mutex::scoped_lock in these functions from time to time it crashes in a scoped lock the call stack is this: 0 0x0040f005 boost::detail::win32::interlocked_bit_test_and_set include/boost/thread/win32/thread_primitives.hpp 361 1 0x0040e879 boost::detail::basic_timed_mutex::timed_lock include/boost/thread/win32/basic_timed_mutex.hpp 68 2 0x0040e9d3 boost::detail::basic_timed_mutex::lock include/boost/thread/win32/basic_timed_mutex.hpp 64 3 0x0040b96b boost::unique_lock<boost::mutex>::lock include/boost/thread/locks.hpp 349 4 0x0040b998 unique_lock include/boost/thread/locks.hpp 227 5 0x00403837 MyClass::inboxSize - this is my inboxSize function that uses this code: MyClass::inboxSize () { boost::mutex::scoped_lock scoped_lock(m_inboxMutex); return m_inbox.size(); } and the mutex is declared like this: boost::mutex m_inboxMutex; it crashes at the last pasted line in this function: inline bool interlocked_bit_test_and_set(long* x,long bit) { long const value=1<<bit; long old=*x; and x has this value: 0xababac17 Thanks for the help

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• How can I set the date format to my country setting?

  - by Jamina Meissner

  I am German, but I use only English software. Hence, I am also using English Ubuntu. It's not because I don't know how to install German Ubuntu. It's because I prefer to work with English software environment. However, I would like to keep date & time format in German format, just as I use a German keyboard layout in English Ubuntu. I can set the time format to 24h time. But how can I set the date format to German time format? It is irritating for me to have the day number before the time numbers: In other words, instead of "Oct 14 15:16" I want it to display "14 Okt" or (if only English language is available) "14 Oct 15:16" or "14th Oct 15:16". At least, the number of the day should be displayed before the month. In Windows, it was no problem to choose time/date/currency settings according to a chosen country. Where can I do this in Ubuntu? The best would be if I could freely enter the date/time format myself with variables (DD.MM hh.mm.ss etc). I found answers for Ubuntu 11.04, but not for Ubuntu 12.04. I am using Ubuntu 12.04, 64-bit. Keep in mind that I am a beginner. So I'd like to be able to do this via GUI, if possible. EDIT: I found the answer in a forum. Go to System Settings... and choose Language Support. There are two tabs, Language and Reginal Formats. You are by default on the Language tab. On the Language tab, click Install / Remove Languages. A window with a list of languages opens. Mark the language(s) you want to add for your time/date/currency format. Click Apply Changes. Ubuntu will now download and install the additional language files, as well as help files of other applications in this language. So don't be irritated. When Ubuntu has finished applying the changes, switch to Regional Formats tab. (Do not change the Language for menus and windows on the Language tab if you only want to change the date/time/unit format). There you can choose from the dropdown list the language for your preferred format for date/time/currency/unit. Log out and log in again to have the changes take effect.

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• What You Said: How You Track Your Time

  - by Jason Fitzpatrick

  Earlier this week we asked you to share your favorite time tracking tips, tricks, and tools. Now we’re back to highlight the techniques HTG readers use to keep tabs on their time. While more than one of you expressed confusion over the idea of tracking how you spend all your time, many of you were more than happy to share the reasons for and the methods you use to stay on top of your time expenditures. Scott uses a fluid and flexible project management tool: I use kanbanflow.com, with two boards to manage task prioritisation and backlog. One board called ‘Current Work’ has three columns ‘Do Today’, ‘In Progress’ and ‘Done’. The other is called ‘Backlog’, which splits tasks into priority groups – ‘Distractions (NU+NI)’, ‘Goals (NU+I)’, ‘Interruptions (U+NI)’, ‘Interruptions (U+NI)’ and ‘Critical (U+I)’, where U is Urgent and I is Important (and N is Not). At the end of each day, I move things from my Backlog to my ‘Current Work’ board, with the idea to keep complete Goals before they become Critical. That way I can focus on ‘Current Work’ Do Today so I don’t feel overwhelmed and can plan my day. As priorities change or interruptions pop up, it’s just a matter of moving tasks between boards. I have both tabs open in my browser all day – this is probably good for knowledge workers strapped to their desk, not so good for those in meetings all day. In that case, go with the calendar on your phone. While the above description might make it sound really technical, we took the cloud-based app for a spin and found the interface to be very flexible and easy to use. Can Dust Actually Damage My Computer? What To Do If You Get a Virus on Your Computer Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked

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• memory map huge file with boost

  - by HaveF

  I want to handle huge files(TB), after several searches, I find boost could be help boost/interprocess/file_mapping.hpp and I also find the demo code. Because the file that I read is too large(TB), so I think I should create a fixed-size of memory(say 1GB), and remap it when the data isn't on the page. But I don't know how to write this part. I only find another web page, which use "boost.iostreams" to handle this problem. I should use the boost.iostreams? or boost.interprocess.file_mapping? (if this one, please show me some codes), thanks!

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• How should I delete a child object from within a parent's slot? Possibly boost::asio specific.

  - by kaliatech

  I have written a network server class that maintains a std::set of network clients. The network clients emit a signal to the network server on disconnect (via boost::bind). When a network client disconnects, the client instance needs to be removed from the Set and eventually deleted. I would think this is a common pattern, but I am having problems that might, or might not, be specific to ASIO. I've tried to trim down to just the relevant code: /** NetworkServer.hpp **/ class NetworkServices : private boost::noncopyable { public: NetworkServices(void); ~NetworkServices(void); private: void run(); void onNetworkClientEvent(NetworkClientEvent&); private: std::set<boost::shared_ptr<const NetworkClient>> clients; }; /** NetworkClient.cpp **/ void NetworkServices::run() { running = true; boost::asio::io_service::work work(io_service); //keeps service running even if no operations // This creates just one thread for the boost::asio async network services boost::thread iot(boost::bind(&NetworkServices::run_io_service, this)); while (running) { boost::system::error_code err; try { tcp::socket* socket = new tcp::socket(io_service); acceptor->accept(*socket, err); if (!err) { NetworkClient* networkClient = new NetworkClient(io_service, boost::shared_ptr<tcp::socket>(socket)); networkClient->networkClientEventSignal.connect(boost::bind(&NetworkServices::onNetworkClientEvent, this, _1)); clients.insert(boost::shared_ptr<NetworkClient>(networkClient)); networkClient->init(); //kicks off 1st asynch_read call } } // etc... } } void NetworkServices::onNetworkClientEvent(NetworkClientEvent& evt) { switch(evt.getType()) { case NetworkClientEvent::CLIENT_ERROR : { boost::shared_ptr<const NetworkClient> clientPtr = evt.getClient().getSharedPtr(); // ------ THIS IS THE MAGIC LINE ----- // If I keep this, the io_service hangs. If I comment it out, // everything works fine (but I never delete the disconnected NetworkClient). // If actually deleted the client here I might expect problems because it is the caller // of this method via boost::signal and bind. However, The clientPtr is a shared ptr, and a // reference is being kept in the client itself while signaling, so // I would the object is not going to be deleted from the heap here. That seems to be the case. // Never-the-less, this line makes all the difference, most likely because it controls whether or not the NetworkClient ever gets deleted. clients.erase(clientPtr); //I should probably put this socket clean-up in NetworkClient destructor. Regardless by doing this, // I would expect the ASIO socket stuff to be adequately cleaned-up after this. tcp::socket& socket = clientPtr->getSocket(); try { socket.shutdown(boost::asio::socket_base::shutdown_both); socket.close(); } catch(...) { CommServerContext::error("Error while shutting down and closing socket."); } break; } default : { break; } } } /** NetworkClient.hpp **/ class NetworkClient : public boost::enable_shared_from_this<NetworkClient>, Client { NetworkClient(boost::asio::io_service& io_service, boost::shared_ptr<tcp::socket> socket); virtual ~NetworkClient(void); inline boost::shared_ptr<const NetworkClient> getSharedPtr() const { return shared_from_this(); }; boost::signal <void (NetworkClientEvent&)> networkClientEventSignal; void onAsyncReadHeader(const boost::system::error_code& error, size_t bytes_transferred); }; /** NetworkClient.cpp - onAsyncReadHeader method called from io_service.run() thread as result of an async_read operation. Error condition usually result of an unexpected client disconnect.**/ void NetworkClient::onAsyncReadHeader( const boost::system::error_code& error, size_t bytes_transferred) { if (error) { //Make sure this instance doesn't get deleted from parent/slot deferencing //Alternatively, somehow schedule for future delete? boost::shared_ptr<const NetworkClient> clientPtr = getSharedPtr(); //Signal to service that this client is disconnecting NetworkClientEvent evt(*this, NetworkClientEvent::CLIENT_ERROR); networkClientEventSignal(evt); networkClientEventSignal.disconnect_all_slots(); return; } I believe it's not safe to delete the client from within the slot handler because the function return would be ... undefined? (Interestingly, it doesn't seem to blow up on me though.) So I've used boost:shared_ptr along with shared_from_this to make sure the client doesn't get deleted until all slots have been signaled. It doesn't seem to really matter though. I believe this question is not specific to ASIO, but the problem manifests in a peculiar way when using ASIO. I have one thread executing io_service.run(). All ASIO read/write operations are performed asynchronously. Everything works fine with multiple clients connecting/disconnecting UNLESS I delete my client object from the Set per the code above. If I delete my client object, the io_service seemingly deadlocks internally and no further asynchronous operations are performed unless I start another thread. I have try/catches around the io_service.run() call and have not been able to detect any errors. Questions: Are there best practices for deleting child objects, that are also signal emitters, from within parent slots? Any ideas as to why the io_service is hanging when I delete my network client object?

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• boost::asio::async_read_until problem

  - by user368831

  Hi again, I'm modify the boost asio echo example to use async_read_until to read the input word by word. Even though I am using async_read_until all the data sent seems to be read from the socket. Could someone please advise: #include <cstdlib> #include <iostream> #include <boost/bind.hpp> #include <boost/asio.hpp> using boost::asio::ip::tcp; class session { public: session(boost::asio::io_service& io_service) : socket_(io_service) { } tcp::socket& socket() { return socket_; } void start() { std::cout<<"starting"<<std::endl; boost::asio::async_read_until(socket_, buffer, ' ', boost::bind(&session::handle_read, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } void handle_read(const boost::system::error_code& error, size_t bytes_transferred) { std::ostringstream ss; ss<<&buffer; std::string s = ss.str(); std::cout<<s<<std::endl; if (!error) { boost::asio::async_write(socket_, boost::asio::buffer(s), boost::bind(&session::handle_write, this, boost::asio::placeholders::error)); } else { delete this; } } void handle_write(const boost::system::error_code& error) { std::cout<<"handling write"<<std::endl; if (!error) { } else { delete this; } } private: tcp::socket socket_; boost::asio::streambuf buffer; }; class server { public: server(boost::asio::io_service& io_service, short port) : io_service_(io_service), acceptor_(io_service, tcp::endpoint(tcp::v4(), port)) { session* new_session = new session(io_service_); acceptor_.async_accept(new_session->socket(), boost::bind(&server::handle_accept, this, new_session, boost::asio::placeholders::error)); } void handle_accept(session* new_session, const boost::system::error_code& error) { if (!error) { new_session->start(); new_session = new session(io_service_); acceptor_.async_accept(new_session->socket(), boost::bind(&server::handle_accept, this, new_session, boost::asio::placeholders::error)); } else { delete new_session; } } private: boost::asio::io_service& io_service_; tcp::acceptor acceptor_; }; int main(int argc, char* argv[]) { try { if (argc != 2) { std::cerr << "Usage: async_tcp_echo_server <port>\n"; return 1; } boost::asio::io_service io_service; using namespace std; // For atoi. server s(io_service, atoi(argv[1])); io_service.run(); } catch (std::exception& e) { std::cerr << "Exception: " << e.what() << "\n"; } return 0; } Thanks!

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• Boost Filesystem Library Visual C++ Compile Error

  - by John Miller

  I'm having the following issue just trying to compile/run some of the example programs with the Boost Filesystem Library. I'm using MS-Visual C++ with Visual Studio .NET (2003). I've installed the Boost libraries, version 1.38 and 1.39 (just in case there was a version problem) using the BoostPro installers. If I just try to include /boost/filesystem/operations.hpp I receive the following error: \boost_1_38\boost\system\error_code.hpp(230) : error C2039: 'type' : is not a member of 'boost::enable_if<boost::system::is_error_condition_enum<Cond,boost::detail::enable_if_default_T>' Any help is greatly appreciated. Thank you!

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• boost::function & boost::lambda - call site invocation & accessing _1 and _2 as the type

  - by John Dibling

  Sorry for the confusing title. Let me explain via code: #include <string> #include <boost\function.hpp> #include <boost\lambda\lambda.hpp> #include <iostream> int main() { using namespace boost::lambda; boost::function<std::string(std::string, std::string)> f = _1.append(_2); std::string s = f("Hello", "There"); std::cout << s; return 0; } I'm trying to use function to create a function that uses the labda expressions to create a new return value, and invoke that function at the call site, s = f("Hello", "There"); When I compile this, I get: 1>------ Build started: Project: hacks, Configuration: Debug x64 ------ 1>Compiling... 1>main.cpp 1>.\main.cpp(11) : error C2039: 'append' : is not a member of 'boost::lambda::lambda_functor<T>' 1> with 1> [ 1> T=boost::lambda::placeholder<1> 1> ] Using MSVC 9. My fundamental understanding of function and lambdas may be lacking. The tutorials and docs did not help so far this morning. How do I do what I'm trying to do?

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• Calculate time in all countries for fixed time in one of them [migrated]

  - by Muiz

  I have table with all countries GMT/UTC timezones, I need to see what time is in the rest of the countries when in USA is 11am-3pm Not on particular date just know the difference in time. I did my calculation like that I -5 GMT in USA and time is 11am then in Russia for example is +4 GMT. 5+4+11=20pm in Russia when USA is 11am, this works with countries that have + GMT zone but ones that have minus it shows wrong time. I am working in Excel please help me with advice on how to do it.

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• GUI time is different than command line time

  - by Kyle

  I have kind of an odd problem. The time in my Unity bar is right, but the time in bash is 2 hours ahead. $ date Wed Jun 20 15:31:55 CDT 2012 Unity bar: Wed Jun 20 13:31:55 Here are my etc configs: $ cat /etc/timezone America/Los_Angeles locale: $ locale LANG=en_US.UTF-8 LANGUAGE= LC_CTYPE="en_US.UTF-8" LC_NUMERIC="en_US.UTF-8" LC_TIME="en_US.UTF-8" LC_COLLATE="en_US.UTF-8" LC_MONETARY="en_US.UTF-8" LC_MESSAGES="en_US.UTF-8" LC_PAPER="en_US.UTF-8" LC_NAME="en_US.UTF-8" LC_ADDRESS="en_US.UTF-8" LC_TELEPHONE="en_US.UTF-8" LC_MEASUREMENT="en_US.UTF-8" LC_IDENTIFICATION="en_US.UTF-8" LC_ALL= Finally, I tried $ sudo dpkg-reconfigure tzdata and setting it to "Los_Angeles". Has anyone seen anything like this?

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