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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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[boost::thread] using futures
by Kazz 09 May '11

09 May '11

Hi All. I am trying to use Futures, but not getting the expected result. The code below works some times, and other times it throws exception "terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::promise_already_satisfied> >' what(): Promise already satisfied" Any help will be appreciated. Thanks Kazz. //-------------------------------------------// boost::promise<int> pt; // holds final calculated result void worker1() { // do any processing using algorithm A srand ( time ( NULL) ); int delay = rand() % 5 + 1; boost::this_thread::sleep( boost::posix_time::seconds(delay)); // result calculate pt.set_value(1); } void worker2() { // do any processing using algorithm B srand ( time ( NULL) ); int delay = rand() % 5 + 1; boost::this_thread::sleep( boost::posix_time::seconds(delay)); // result calculated pt.set_value(2); } int main() { boost::shared_future<int> ans(pt.get_future()); boost::thread th1(worker1); boost::thread th2(worker2); ans.wait(); std::cout<<ans.get()<<std::endl; std::cout<<"exiting"<<std::endl; return 0; }

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String serialization
by Robert Bielik 09 May '11

09 May '11

I'd like to (XML) serialize a non-STL string, and I'd like it to serialize in the same manner as STL string (i.e. just the plain string as CDATA). I can do it like: <myString> <s>The string...</s> </myString> but I'd like: <myString>The string...</myString> the serialization implementation of std::string is a menace to decipher... TIA /Rob

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[asio] IPv6 interface index
by Dylan Klomparens 09 May '11

09 May '11

Hello, I am trying to use Boost for some IPv6 and multicast network communication. I need to construct an IPv6 multicast socket that uses a specific network interface index. I was able to find the correct multicast option to set the network interface index in boost/asio/ip/detail/socket_option.hpp: explicit multicast_request(const boost::asio::ip::address_v6& multicast_address, unsigned long network_interface = 0) The problem is, I don't know how to find the correct value for the "network_interface" parameter. Is there a way to get the network_interface value using a local IPv6 address that I can provide? I looked in the documentation and examples, but couldn't find anything. -- Dylan

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[msm] EUML in a header file
by Nate Knight 09 May '11

09 May '11

Christophe, One problem I've run into with the EUML frontend is the the _EVENT, _ACTION and _STATE macros define non-static instance variables. So, if I define a state machine in a header file which then gets included in multiple source files (e.g. I have two classes which use the same state machine) I get linker errors about duplicate instances. For states, I can work around this issue by doing, for example, BOOST_MSM_EUML_DECLARE_STATE((),MyStateType) static MyStateType MyState; and then using MyState in the transition table. Events and Actions don't seem to have the corresponding _DECLARE_ macros, so this workaround isn't really feasible at this point in time. Any thoughts? Thanks Nate

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Usage of boost serialization binary_object
by Robert Bielik 09 May '11

09 May '11

Hi all, I'm wondering how to load a binary object from an archive ? I've managed to use binary_object to save it nicely, but I can't find any references on how to load it again :( TIA /Rob

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

09 May '11

>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >> With gcc 4.5 and Boost 1.46.1, I get: >> >> simpletest.cpp: In function 'int main()': >> simpletest.cpp:30:75: error: no match for 'operator<<' in >> 'boost::msm::back::states_ << test_state_with_constructor(1)' > > Ok, I see what it is, I did not solve correctly my conflict between > proto and serialization. > I just committed a fix into the trunk (revision 71719), but it's not > working, I simply run into my next proto problem :( > > I'll continue working on this tomorrow. I fixed the second problem too (revision 71746) in the trunk. It should now work correctly. Thanks, Christophe

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Re: [Boost-users] ASIO sockets - 2nd write fails
by bill comment 09 May '11

09 May '11

> > 'new_connection_' always points to an invalid socket because after a > connection is established you always replace it with a new one. > yes. i was suspecting this but didn't fully understand. thanks for confirming. my solution was to change my architecture to that of the ChatServer sample where a reference to my Connection object (parallel to their participant/session) is handed to a new Client object (parallel to their room) so that it will live for the duration of the client app's connection and my server can write several responses. thanks for the responses.

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[forEach] Working with custom operator []
by Avishay Ben Shabtai 09 May '11

09 May '11

Hi i have a container class that defines 2 overloaded [] operators: T& operator[](const chat *); T& operator[](unsigned int); when i am using BOOST_FOREACH(T val,container) i get compilation errors but working directly with iterators is working ok, any idea?

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