September 2009 - Boost-users

[BGL] Accessing graph_properties member
by Caligula 09 Sep '09

09 Sep '09

How can I access a member of graph_properties, such as a boolean or a vertex descriptor? A map might not be appropriate because there is only one graph. -Caligula

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Re: [Boost-users] serialization::make_nvp parameters
by Hammond, John (UK New Malden) 09 Sep '09

09 Sep '09

> The space may be a problem. Boost.Serialization sticks the name directly into the XML, and <x:1 y:2></x:1 y:2> is bad. It appears that this was indeed the problem - a rookie mistake. By removing any spaces I am able to drop name.c_str() straight in to ::make_nvp() with no problems. To provide further context, the reason I want to assign the tags dynamically is because I am using the Serialization library in a simpler fashion than that for which it was designed. I only wish to provide a means of outputting the state of a window and I have no desire to export in a format that can be reliably read back in to the same system. Thanks for all your help, John ******************************************************************** This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. ********************************************************************

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serialization::make_nvp parameters
by Hammond, John (UK New Malden) 09 Sep '09

09 Sep '09

Hello, I am hoping someone could answer a question I have regarding the make_nvp(..) function of the Serialization library. I am attempting to serialize a number of objects within a loop, and the name of the name-value-pair is to be assigned dynamically depending on some values taken from within the object that is to be serialized. I am currently performing the actions below: my_obj = GetMyObj(..); std::string temp = str( boost::format("x:%1% y:%2%") % _x % _y ); const char* const_temp = temp.c_str( ); ar & boost::serialization::make_nvp(const_temp, my_obj); This code compiles but will cause an exception on make_nvp. As far as I can tell, I am providing the function with the const char* that it requires, so am very confused as to why it is not performing as expected. Any help with this would be greatly appreciated. John Hammond ******************************************************************** This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. ********************************************************************

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Re: [Boost-users] [shared_ptr] deleter that destroys shared_pt r -is it safe?
by Stefan Strasser 09 Sep '09

09 Sep '09

> This was fixed in 1.39, if I'm not mistaken (see revision 51643). Are you sure that it fails with the current implementation? no, "current" means 1.38 in my case.

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[BGL] delete children subgraphs
by Marti Cuquet 09 Sep '09

09 Sep '09

Hello, I have a root subgraph from which I create a lot of children subgraphs, that use too much memory. How can I delete the children subgraphs after using them? Thanks, Marti

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[shared_ptr] deleter that destroys shared_ptr - is it safe?
by Igor R 09 Sep '09

09 Sep '09

Hello, Is the following code legal and safe - a) according to the shared_ptr specs b) with the current boost::shared_ptr implementation Thanks! struct a { a() : p_(this, mem_fn(&a::delete_me)) {} void reset() { p_.reset(); } void delete_me() { delete this; } shared_ptr<a> p_; }; int main() { a* p = new a; p->reset(); }

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[statechart] Broadcasting events to orthogonal states
by Vladimír Třebický 09 Sep '09

09 Sep '09

Hi all, first of all: thanks for the great library! I just dug into the boost::statechart tutorial trying to figure out how to deal with the following simple scenario: Let's say I have a complex application server represented by a single boost::state_chart with multiple modules (eg. network, database, etc.) represented by orthogonal spaces. I have a couple of system-wide events like "system shutdown". Handling these eventa is generally non-trivial and I'd like all the modules to process it independently. As I understand, statechart tries to deliver an event across al of the orthogonal spaces discarding it once it's processed by any of them (ie. by "return transit", "return discard_event", etc.). But I'd like these events to be delivered to _all_ orthogonal spaces no matter what they do with it. I could create a state for each of the orthogonal spaces. These wrappers would accept the system-wide events, translate them to local-events, post them locally and forward the system-wide event. But that's basically like having multiple statecharts for each of the modules and dispatching system-wide events manually. Thanks, Vladimir.

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How to use boost 1.39 with eclipse
by manish4gupta 09 Sep '09

09 Sep '09

Hi , I am working on shared memory.I am using boost interprocess and regex module. I tried to install on ubuntu but it pop up errors for unrecognized function.So now i am planning to use boost interprocess and boost regex module in eclipse. How can i do that? Please help as i am in great need. Regards -- View this message in context: http://www.nabble.com/How-to-use-boost-1.39-with-eclipse-tp25356863p2535686… Sent from the Boost - Users mailing list archive at Nabble.com.

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[asio] compile error on Solaris 10
by Wang, Paul 08 Sep '09

08 Sep '09

I'm including <boost/asio.hpp> and I'm getting the following compile error on Solaris 10 using gcc 3.4.3 with both Boost 1.39 and 1.40. In file included from /opt/boost_1_39_0/boost/asio/detail/socket_types.hpp:111, from /opt/boost_1_39_0/boost/asio/detail/win_iocp_io_service_fwd.hpp:24, from /opt/boost_1_39_0/boost/asio/io_service.hpp:37, from /opt/boost_1_39_0/boost/asio/basic_io_object.hpp:20, from /opt/boost_1_39_0/boost/asio/basic_socket.hpp:24, from /opt/boost_1_39_0/boost/asio/basic_datagram_socket.hpp:25, from /opt/boost_1_39_0/boost/asio.hpp:20, ... /usr/include/net/if.h:99: error: template argument required for `struct map' Does anyone know of a work around for this? Thanks, Paul

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Can we pass variable argument list to boost format?
by ajil koshy 08 Sep '09

08 Sep '09

Hi, I'd like to know if there is a way by which we can pass the variable argument list to boost format. I have a function which creates formatted output strings for logging purpose. Currently, I'm using _vsnwprintf_s function internally to handle variable argument lists which the caller may be pass to this function. Can this be done using boost format? Thanks Ajil

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