December 2008 - Boost-users

Binding to a function with optional parameters
by Yang Zhang 02 Dec '08

02 Dec '08

Is there a way to bind to a function with optional arguments? See my simple demo program below to see what I've tried: #include <boost/bind.hpp> #include <iostream> using namespace boost; using namespace std; int f(int x, int y = 0) { return x + y; } // Commented lines below don't compile. int main() { cout << bind(f, 1, 2)() << endl; // cout << bind(f, 1)() << endl; int (*p)(int, int) = f; cout << bind(p, 1, 2)() << endl; // int (*q)(int) = f; // cout << bind(q, 1)() << endl; return 0; } -- Yang Zhang http://www.mit.edu/~y_z/

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[bind] an easy way to break ORD ? (where am i wrong?)
by Alexander 02 Dec '08

02 Dec '08

>From http://www.boost.org/doc/libs/1_37_0/libs/bind/bind.html#Synopsis : namespace { unspecified-placeholder-type-1 _1; unspecified-placeholder-type-2 _2; unspecified-placeholder-type-3 _3; // implementation defined number of additional placeholder definitions } Then I use placeholders like this: class X { void h(int); void f1() { return boost::bind(&X::h, this, _1)(3); } } As f1 is inline, it should be the same in all the translation units, to obey ODR. However, anonyomous namespace is different in a different translation unit, so _1 is different variable. Is One Definition Rule broken ?

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boost::interprocess::message_queue
by Romain C. 02 Dec '08

02 Dec '08

Hello everyone, I am currently developing a multi-threading application and i would like to use a message queue to receive / send information between the different threads. However, I have tried to check if the boost message queue was thread-safe or not but i could not find the information. Can anyone tell me if the boost message queue is thread-safe? Thank you. Romain C. -- View this message in context: http://www.nabble.com/boost%3A%3Ainterprocess%3A%3Amessage_queue-tp20597994… Sent from the Boost - Users mailing list archive at Nabble.com.

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-Wundef warnings
by Yang Zhang 02 Dec '08

02 Dec '08

When using the -Wundef flag with gcc, I get warnings like the following: error: "BOOST_MSVC" is not defined At least once before this was brought up on the lists: http://lists.boost.org/boost-users/2006/10/22819.php The suggested solution is to disable this warning. However, it seems to make more sense to just fix this in Boost (using #if defined(...) or #ifdef). Why not make this fix in Boost? -- Yang Zhang http://www.mit.edu/~y_z/

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[program_options] is a more complicated usage supported?
by Stephan Menzel 02 Dec '08

02 Dec '08

Hi there, I'm using program_options on 1.36, quite successfully so far with only simple use cases. However, now I have to do something a little more tricky. Essentially, I'd like to parse everything before a certain point and treat everything after that as positional_options. Goal is to have a variable command line that can take arbitary commands, much in the fashion tools such as valgrind and strace would. Consider this: ./mytool --myopt 1 --anotheropt bla ./someapp --appoption 1 So mytool would need to parse it's own options 'myopt' and 'anotheropt' and then be aware of the string './someapp --appoption 1' to eventually fork whatever is there. And to make it a little more interesting some of the options should be optional. Alas, docs don't really get into that so I'm wondering if/how this could be done. This is what I got: po::options_description desc("Allowed options, after that state the desired command"); desc.add_options() ("anotheropt,a", po::value<std::string>(), "some other option") ("myopt,o", po::value<boost::uint16_t>()->default_value(1), "optional value 1") ; po::variables_map vmap; po::store(po::parse_command_line(argc, argv, desc), vmap); po::notify(vmap); // at this point I got my options. po::positional_options_description pd; pd.add("command", -1); po::parsed_options parsed = po::command_line_parser(argc, argv).options(desc).allow_unregistered().run(); std::vector<std::string> command_options = collect_unrecognized(parsed.options, po::include_positional); // here I got command_options filled with the unrecognized options. ...snip... That works OK as long as my command line does not have any options starting with - or -- at it's own. As soon as the command to be forked has such options, the first po::store() would throw because it tries to parse them. Is there any way to prevent this? Thanks and greetings... Stephan

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[boost::filesystem::wpath]wpath missing in boost 1.37?
by Ken zhang 02 Dec '08

02 Dec '08

Hi Dear I want use boost::filesystem::wpath for directory operation, It worked fine in VS2005, but I can't compile the same code by code::block + MinGW. The compiler report error below. D:\Development\Tools\boosttest\localization.cpp:14: error: `wpath' is not a member of `boost::filesystem' D:\Development\Tools\boosttest\localization.cpp:14: error: expected `;' before "path" D:\Development\Tools\boosttest\localization.cpp:15: error: `path' was not declared in this scope How can I resolve it ? Is it a bug in MinGW? Thanks -- Best Regards, Kennir

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help
by Arpitha Inderjith (RBEI/EMT1) 02 Dec '08

02 Dec '08

unsubscribe -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of boost-users-request(a)lists.boost.org Sent: Tuesday, 2. December 2008 3:51 AM To: boost-users(a)lists.boost.org Subject: Boost-users Digest, Vol 1831, Issue 3 Send Boost-users mailing list submissions to boost-users(a)lists.boost.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.boost.org/mailman/listinfo.cgi/boost-users or, via email, send a message with subject or body 'help' to boost-users-request(a)lists.boost.org You can reach the person managing the list at boost-users-owner(a)lists.boost.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Boost-users digest..." Today's Topics: 1. LNK2019 with boost::thread_group [!] (Joseph A. Marks) 2. new to Boost and ASIO (James Peng) 3. Re: LNK2019 with boost::thread_group [!] (Steven Watanabe) 4. Re: new to Boost and ASIO (Steven Watanabe) 5. Re: -Wundef warnings (Yang Zhang) 6. new user got compile error (James Peng) 7. Re: new user got compile error (Steven Watanabe) 8. Re: new to Boost and ASIO (boost001) 9. Re: new user got compile error (boost001) ---------------------------------------------------------------------- Message: 1 Date: Mon, 1 Dec 2008 09:59:17 -0800 (PST) From: "Joseph A. Marks" <josephamarks(a)yahoo.com> Subject: [Boost-users] LNK2019 with boost::thread_group [!] To: boost-users(a)lists.boost.org Message-ID: <224720.62760.qm(a)web32904.mail.mud.yahoo.com> Content-Type: text/plain; charset=us-ascii Here is what I'm trying to do: boost::thread_group threadGroup; for( ; port_min <= port_max; ++port_min ) { threadGroup.add_thread(new boost::thread(boost::bind(CCUThread, port_min, strategy))); } I am getting the following error: error LNK2001: unresolved external symbol "void __cdecl boost::assertion_failed(char const *,char const *,char const *,long)" (?assertion_failed@boost@@YAXPBD00J@Z) ..\bin\ccu_simulator.exe : fatal error LNK1120: 1 unresolved externals Is this Boost-related? I found one posting that was somewhat similar on the web, but the user found an error elsewhere, and it shed no light on the situation. I am also getting several other LNK1120 errors that may be related to Boost. I am converting working VS 6.0 (and occasionally 2005) code to VS 2008; this has caused this link error to appear. I also have changed Boost from v. 1.31 to 1.36; whether this affects the above linker errors I do not know. Any help would be appreciated. Last time I posted about a linking error, I received no replies at all, so if someone knows something, please reply. Thanks Again! (-: Sincerely, Joseph Joseph A. Marks PHONE: 612-788-9658 e-mail: josephamarks(a)yahoo.com ------------------------------ Message: 2 Date: Mon, 1 Dec 2008 12:28:04 -0800 (PST) From: James Peng <oldyoungguy88(a)yahoo.com> Subject: [Boost-users] new to Boost and ASIO To: boost-users(a)lists.boost.org Message-ID: <376665.40525.qm(a)web110007.mail.gq1.yahoo.com> Content-Type: text/plain; charset="us-ascii" just build asio, what's the next? Do I need the entire bin.v2 folder plus the boost folder or I only need those .a files plus the boost folder. thanks, James

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./configure: Permission denied (Mac)
by framebuffer 02 Dec '08

02 Dec '08

Hi! I am trying to install boost 1.37 on Leopard 10.5.2. I have put boost_1_37_0 in my home directory and I have successfully compiled and executed a header only application. I am following the following instructions: http://www.boost.org/doc/libs/1_37_0/more/getting_started/unix-variants.html When I try to run ./configure --help I get a permission denied error. -bash: ./configure: Permission denied When I say sudo: ./configure sudo: ./configure: command not found The configure file is certainly there. I have even tried to make it readable and writable by everyone. Any ideas? Thanks. -- View this message in context: http://www.nabble.com/.-configure%3A-Permission-denied-%28Mac%29-tp20765691… Sent from the Boost - Users mailing list archive at Nabble.com.

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new to Boost and ASIO
by James Peng 02 Dec '08

02 Dec '08

just build asio, what's the next? Do I need the entire bin.v2 folder plus the boost folder or I only need those .a files plus the boost folder. thanks, James

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new user got compile error
by James Peng 01 Dec '08

01 Dec '08

Just started using Boost. Socket only right now. Created one small class but cannot compile. Please help. Compile error is In file included from Server.cpp:8: ./include/Server.h:26: error: ‘io_service’ is not a type ./include/Server.h:26: error: expected unqualified-id before ‘(’ token ./include/Server.h:26: error: expected `)' before ‘(’ token ./include/Server.h:26: error: expected ‘,’ or ‘...’ before ‘(’ token ./include/Server.h:26: error: expected ‘;’ before ‘)’ token ./include/Server.h:27: error: ‘io_service’ is not a type ----- My header file: /* * Server.h * * Created on: Dec 1, 2008 * Author: */ #ifndef SERVER_H_ #define SERVER_H_ #include <boost/asio.hpp> class Server{ public: Server(){}; ~Server(){}; void print(); protected: private: boost::asio::io_service io_service; boost::asio::ip::tcp::acceptor acceptor(io_service, boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), 13)); boost::asio::ip::tcp::socket asio_socket(io_service); boost::system::error_code error_read; }; #endif /* SERVER_H_ */ ----- My cpp file: /* * Server.cpp * * Created on: Dec 1, 2008 * Author: */ #include "Server.h" void Server::print(){ }

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