May 2011 - Boost-users - lists.boost.org

boost::asio:read and timeout
by Carla Strembicke 10 May '11

10 May '11

Hi, This has probably been asked before. Is there a way to apply a timeout on the synchronous read for a socket in boost. I have no option but to do a synchronous read. If not is there a ticket and when is the release date for this functionality. Thanks CONFIDENTIAL INFORMATION NOTICE: The information contained in this e-mail is privileged, confidential and intended solely for the use of the addressee named above. If the reader of this e-mail is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this e-mail is strictly prohibited. If you received this in error, please contact the sender and destroy all copies of this e-mail. Thank you.

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[variant] erase a type
by Igor R 10 May '11

10 May '11

Hello, I have to erase a variant element (type). Certainly, I can take its underlying mpl sequence, find<> what I need, erase<> it, and make another variant. I believe all this will be rather heavy in terms of compile-time/resources, so perhaps there's another more short way that I miss? Thanks.

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Re: [Boost-users] Boost-users Digest, Vol 2718, Issue 2
by Mupparthy Ravindranath 10 May '11

10 May '11

Or [as a 2nd thought], should I use it like below: - pass raw object pointer to callback fn. - in the callback ________________________________ From: "boost-users-request(a)lists.boost.org" <boost-users-request(a)lists.boost.org> To: boost-users(a)lists.boost.org Sent: Tuesday, 10 May 2011 4:32 PM Subject: Boost-users Digest, Vol 2718, Issue 2 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. Re: Boost-users Digest, Vol 2718, Issue 1 (Mupparthy Ravindranath) ---------------------------------------------------------------------- Message: 1 Date: Tue, 10 May 2011 16:32:28 +0530 (IST) From: Mupparthy Ravindranath <rv_nath(a)yahoo.com> To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> Subject: Re: [Boost-users] Boost-users Digest, Vol 2718, Issue 1 Message-ID: <64558.18057.qm(a)web94805.mail.in2.yahoo.com> Content-Type: text/plain; charset="iso-8859-1" Actually, My intention is to pass a shared_ptr, as against a raw ptr.? The purpose is that after execting the callback, the shared_ptr can go out of scope, and ensure object deletion on its own, without having to call an explicit delete. So, I really wanted to pass a shared_ptr to the callback fn, as a void*. The reason behind this is... - i have a 3rd party timer engine, which accepts a callback function and callback args. - On timer expiry, it calls my regd callback implmentation, along with the args passed in its start_timer function. - Earlier, I was passing an object* to the callback args of the timer. - If the timer event fires, my callback impl gets called, and I get a chance to do a "delete", which is fine. - In some cases, I have to cancel / stop the timer.? And then since, my callback doesn't fire, I have no way to delete the obj*, and results in a memory leak. So, I wanted to pass a shared_ptr itself as the callback argument for my 3rd party timer. So that, even if timer doesn't fire, my object won't leak. regards, RV ________________________________ From: "boost-users-request(a)lists.boost.org" <boost-users-request(a)lists.boost.org> To: boost-users(a)lists.boost.org Sent: Tuesday, 10 May 2011 4:15 PM Subject: Boost-users Digest, Vol 2718, Issue 1 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. Re: Error: guid_defined is not ? ? ? templateBOOST_CLASS_EXPORT_GUID (Robert Ramey) ? 2. Re: [Boost][program-options] Original position of an??? argument ? ? ? in command-line. (Vladimir Prus) ? 3. How to cast a boost::shared_ptr to void* (Mupparthy Ravindranath) ? 4. Re: How to cast a boost::shared_ptr to void* (Robert Jones) ? 5. Re: How to cast a boost::shared_ptr to void* (michi7x7) ? 6. Re: How to cast a boost::shared_ptr to void* ? ? ? (Mupparthy Ravindranath) ? 7. Re: How to cast a boost::shared_ptr to void* (Robert Jones) ? 8. Re: [Boost][program-options] Original position of an argument ? ? ? in command-line. (Germ?n Diago) ---------------------------------------------------------------------- Message: 1 Date: Mon, 9 May 2011 21:57:06 -0800 From: "Robert Ramey" <ramey(a)rrsd.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Error: guid_defined is not ??? templateBOOST_CLASS_EXPORT_GUID Message-ID: <iqagie$sbh$1(a)dough.gmane.org> Jari wrote: > Hi > I am using boost serialization and it was working fine (save load > works) but then I tried using BOOST_CLASS_EXPORT_GUID and get weird > error. > > The line that gives the error is this: > > BOOST_CLASS_EXPORT_GUID( Bakery, "Bakery") > > > (I put the code in Cpp to avoid any problems with headers.) > > > And this is the full Visual studio express 2010 error: > > 2>E:\boost_1_46_1\boost/archive/detail/check.hpp(162): error C2338: > typex::value ... what does the code look like at line 162 of check.hpp ? Robert Ramey ------------------------------ Message: 2 Date: Tue, 10 May 2011 10:45:04 +0400 From: Vladimir Prus <vladimir(a)codesourcery.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] [Boost][program-options] Original position ??? of an??? argument in command-line. Message-ID: <iqamtg$nvf$1(a)dough.gmane.org> Content-Type: text/plain; charset="UTF-8" Germ?n Diago wrote: > Hi all. I have a question regarding boost.program_options. > > I want to parse a command-line but I want to know the order in which > each option appeared in the > command line. Is this possible? Thanks in advance. parse_command_line returns vector< basic_option<charT> >, which are in the order of occurence. This is a point where you can do logic based on the order. variables_map does not store order information. HTH, -- Vladimir Prus Mentor Graphics +7 (812) 677-68-40 ------------------------------ Message: 3 Date: Tue, 10 May 2011 13:26:09 +0530 (IST) From: Mupparthy Ravindranath <rv_nath(a)yahoo.com> To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> Subject: [Boost-users] How to cast a boost::shared_ptr to void* Message-ID: <257490.53596.qm(a)web94803.mail.in2.yahoo.com> Content-Type: text/plain; charset="iso-8859-1" Hi all, My requirement is to cast an object of type shared_ptr as void*, so that I can send it to a callback function that accepts a void*.? I cannot change callback the function signature because it is part of an existing legacy code. In the existing code, I am sending a raw object pointer (instead of shared_ptr).? Now, if I want to pass a shared_ptr, it won't compile because I cannot cast the shared ptr to void*.? Can anyone suggest some workaround for this.? I tried searching the mailing lists and internet, but not much luck. regards, RV

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Re: [Boost-users] Boost-users Digest, Vol 2718, Issue 1
by Mupparthy Ravindranath 10 May '11

10 May '11

Actually, My intention is to pass a shared_ptr, as against a raw ptr. The purpose is that after execting the callback, the shared_ptr can go out of scope, and ensure object deletion on its own, without having to call an explicit delete. So, I really wanted to pass a shared_ptr to the callback fn, as a void*. The reason behind this is... - i have a 3rd party timer engine, which accepts a callback function and callback args. - On timer expiry, it calls my regd callback implmentation, along with the args passed in its start_timer function. - Earlier, I was passing an object* to the callback args of the timer. - If the timer event fires, my callback impl gets called, and I get a chance to do a "delete", which is fine. - In some cases, I have to cancel / stop the timer. And then since, my callback doesn't fire, I have no way to delete the obj*, and results in a memory leak. So, I wanted to pass a shared_ptr itself as the callback argument for my 3rd party timer. So that, even if timer doesn't fire, my object won't leak. regards, RV ________________________________ From: "boost-users-request(a)lists.boost.org" <boost-users-request(a)lists.boost.org> To: boost-users(a)lists.boost.org Sent: Tuesday, 10 May 2011 4:15 PM Subject: Boost-users Digest, Vol 2718, Issue 1 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. Re: Error: guid_defined is not templateBOOST_CLASS_EXPORT_GUID (Robert Ramey) 2. Re: [Boost][program-options] Original position of an argument in command-line. (Vladimir Prus) 3. How to cast a boost::shared_ptr to void* (Mupparthy Ravindranath) 4. Re: How to cast a boost::shared_ptr to void* (Robert Jones) 5. Re: How to cast a boost::shared_ptr to void* (michi7x7) 6. Re: How to cast a boost::shared_ptr to void* (Mupparthy Ravindranath) 7. Re: How to cast a boost::shared_ptr to void* (Robert Jones) 8. Re: [Boost][program-options] Original position of an argument in command-line. (Germ?n Diago) ---------------------------------------------------------------------- Message: 1 Date: Mon, 9 May 2011 21:57:06 -0800 From: "Robert Ramey" <ramey(a)rrsd.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Error: guid_defined is not templateBOOST_CLASS_EXPORT_GUID Message-ID: <iqagie$sbh$1(a)dough.gmane.org> Jari wrote: > Hi > I am using boost serialization and it was working fine (save load > works) but then I tried using BOOST_CLASS_EXPORT_GUID and get weird > error. > > The line that gives the error is this: > > BOOST_CLASS_EXPORT_GUID( Bakery, "Bakery") > > > (I put the code in Cpp to avoid any problems with headers.) > > > And this is the full Visual studio express 2010 error: > > 2>E:\boost_1_46_1\boost/archive/detail/check.hpp(162): error C2338: > typex::value ... what does the code look like at line 162 of check.hpp ? Robert Ramey ------------------------------ Message: 2 Date: Tue, 10 May 2011 10:45:04 +0400 From: Vladimir Prus <vladimir(a)codesourcery.com> To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] [Boost][program-options] Original position of an argument in command-line. Message-ID: <iqamtg$nvf$1(a)dough.gmane.org> Content-Type: text/plain; charset="UTF-8" Germ?n Diago wrote: > Hi all. I have a question regarding boost.program_options. > > I want to parse a command-line but I want to know the order in which > each option appeared in the > command line. Is this possible? Thanks in advance. parse_command_line returns vector< basic_option<charT> >, which are in the order of occurence. This is a point where you can do logic based on the order. variables_map does not store order information. HTH, -- Vladimir Prus Mentor Graphics +7 (812) 677-68-40 ------------------------------ Message: 3 Date: Tue, 10 May 2011 13:26:09 +0530 (IST) From: Mupparthy Ravindranath <rv_nath(a)yahoo.com> To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> Subject: [Boost-users] How to cast a boost::shared_ptr to void* Message-ID: <257490.53596.qm(a)web94803.mail.in2.yahoo.com> Content-Type: text/plain; charset="iso-8859-1" Hi all, My requirement is to cast an object of type shared_ptr as void*, so that I can send it to a callback function that accepts a void*.? I cannot change callback the function signature because it is part of an existing legacy code. In the existing code, I am sending a raw object pointer (instead of shared_ptr).? Now, if I want to pass a shared_ptr, it won't compile because I cannot cast the shared ptr to void*.? Can anyone suggest some workaround for this.? I tried searching the mailing lists and internet, but not much luck. regards, RV

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[Boost][program-options] Original position of an argument in command-line.
by Germán Diago 10 May '11

10 May '11

Hi all. I have a question regarding boost.program_options. I want to parse a command-line but I want to know the order in which each option appeared in the command line. Is this possible? Thanks in advance.

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Re: [Boost-users] How to cast a boost::shared_ptr to void*
by Mupparthy Ravindranath 10 May '11

10 May '11

Sorry for the spam. I got the answer, how to do it. Ignore my previous mail. [quote] #include <boost/shared_ptr.hpp> #include <iostream> using namespace std; class A { public: void hello () { cout << "Hello, friends...!" << endl; } }; typedef boost::shared_ptr<A> APtr; void* callbk (void* o) { APtr a = *static_cast<APtr*>(o); a->hello(); } int main() { A* rawPtr = new A; boost::shared_ptr<A>sPtr(rawPtr); callbk((void*)&sPtr); return 0; } [/quote] warm regars, RV ________________________________ From: Mupparthy Ravindranath <rv_nath(a)yahoo.com> To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> Sent: Tuesday, 10 May 2011 1:26 PM Subject: How to cast a boost::shared_ptr to void* Hi all, My requirement is to cast an object of type shared_ptr as void*, so that I can send it to a callback function that accepts a void*. I cannot change callback the function signature because it is part of an existing legacy code. In the existing code, I am sending a raw object pointer (instead of shared_ptr). Now, if I want to pass a shared_ptr, it won't compile because I cannot cast the shared ptr to void*. Can anyone suggest some workaround for this. I tried searching the mailing lists and internet, but not much luck. regards, RV

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How to cast a boost::shared_ptr to void*
by Mupparthy Ravindranath 10 May '11

10 May '11

Hi all, My requirement is to cast an object of type shared_ptr as void*, so that I can send it to a callback function that accepts a void*. I cannot change callback the function signature because it is part of an existing legacy code. In the existing code, I am sending a raw object pointer (instead of shared_ptr). Now, if I want to pass a shared_ptr, it won't compile because I cannot cast the shared ptr to void*. Can anyone suggest some workaround for this. I tried searching the mailing lists and internet, but not much luck. regards, RV

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boost graph: Error with compressed_sparse_row graph and strong_components
by aitor 10 May '11

10 May '11

Hi, the following example (taken from csr example in boost docs) fails when calling strong_components algorithm. The error message is: /usr/include/boost-1.46.1/boost/graph/strong_components.hpp:59: error: no matching function for call to 'get(int*&, unsigned int&)' the program works with boost 1.41.0 any help would be much appreciated :-) #include <boost/graph/compressed_sparse_row_graph.hpp> #include <string> #include <fstream> #include <boost/graph/strong_components.hpp> using namespace boost; int main() { typedef std::pair<int, int> E; E the_edges[] = { E(0, 1), E(0, 2), E(0, 3), E(1, 0), E(1, 3), E(1, 5), E(2, 0), E(2, 5), E(3, 1), E(3, 4), E(4, 1), E(5, 0), E(5, 2) }; typedef compressed_sparse_row_graph<directedS> WebGraph; WebGraph g(boost::edges_are_sorted, &the_edges[0], &the_edges[0] + sizeof(the_edges)/sizeof(E), 6); // strong components std::vector<int> v(6); int i = boost::strong_components(g, &v[0]); std::cout << i << "\n"; return 0; }

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[Spirit] Alternatives and single member struct doesn't compile
by Vitaly Budovski 10 May '11

10 May '11

Hi, Please see the attached file. What am I doing wrong? qi/detail/assign_to.hpp:121: error: invalid static_cast from type ‘const test_b’ to type ‘unsigned char’ Thanks.

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Re: [Boost-users] [msm] EUML and State construction
by Christophe Henry 09 May '11

09 May '11

> Thanks Christophe. One other thing I noticed. In > msm/front/euml/common.hpp, in > MSM_EUML_EVENT_INSTANCE_HELPER_ATTRIBUTE_MAP > there is an unused variable "dummyval" that causes warnings in gcc > compilers. Is naming this variable necessary to support other > compilers, or can it be unnamed? No, it's not necessary at all, it just was forgotten. Every new gcc version brings a few instances of it :( I just fixed it in the trunk (for 1.47). Thanks, Christophe

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