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linking boost libraries to custom c and c++ runtime on windows
by Adrian Gierakowski 25 May '11

25 May '11

Hello, Is it possible to tell bjam (on windows) to compile boost libraries and link them to custom c\c++ runtime libraries instead of the ones provided bt Microsoft? Thanks! -- Adrian Gierakowski

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[Lambda] Handling Bind/Lambda name clashes.
by Robert Jones 25 May '11

25 May '11

Im compiling in an environment which #includes <boost::bind.hpp>, so I can't get away from it! I'd like to use Boost.Lambda sometimes, but run into namespace clashes. This code snippet works... #include <boost/lambda/lambda.hpp> #include <boost/lambda/bind.hpp> #include <boost/range.hpp> #include <vector> #include <numeric> // and also this... #include <boost/bind.hpp> struct X { int f( ) const { return 1; } }; int sum( int a, int b ) { return a + b; } int main( ) { boost::lambda::placeholder1_type x; boost::lambda::placeholder2_type y; std::vector<X> v; std::accumulate( boost::begin( v ), boost::end( v ), 0, bind( sum, x, bind( &X::f, y ) ) ); } but as soon as I extract the innermost bind into a Boost.Function, I seem to need to fully qualify all the binds, ie int main( ) { boost::lambda::placeholder1_type x; boost::lambda::placeholder2_type y; std::vector<X> v; boost::function<int(int, int)> my_sum = bind( sum, x, y ); std::accumulate( boost::begin( v ), boost::end( v ), 0, boost::lambda::bind( my_sum, x, bind( &X::f, y ) ) ); } Is there any easy way around this? It would be nice to able to name my inner binds in a meaningful way, but all the explicit qualification gets a bit cumbersome! Thx - Rob.

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Re: [Boost-users] [boost][msm] std::vector<MyStateMachine> generate stack overflow
by Christophe Henry 25 May '11

25 May '11

>It's not the vector, it's the copy constructor. You can see the same problem with : > > > RealStateMachine sma; > RealStateMachine smb( sma ); > >At the moment I'm not sure exactly what makes it a recursive call. Was the generated state machine not thought to be copied, or did I made a mistake? Yes, a state machine can be copied and no you didn't make any mistake. I think it's a compiler bug because: - it works fine with g++ 4.5 - the debugger doesn't even make it to the copy-constructor. I remember I had in the past problems when inheriting from a state machine with VC. The only solutions I see is to use a typedef instead or using aggregation instead of inheritance. This works: typedef boost::msm::back::state_machine< StateMachine > RealStateMachine; Unfortunately, I cannot help on this. Maybe Stephan is aware of this problem? Christophe

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how are the iterative/looping mechanism implemented in boost preprocessor?
by R A 25 May '11

25 May '11

at first i thought that the boost library came with it's own implementation of a c preprocessor, as i thought that was the only way it could be doing all that iteration (multiple "patterned" declarations, etc, etc) and the c standard hasn't introduced a notion of counters... i've considered concatenation, but that incurs a "final" string to be compared which cannot be generated automatically a priori (correct me if i'm mistaken). but when i looked at boost thoroughly, it seems to be doing everything in standard. so can anybody tell me how that is done? a sort of pseudo-code for doing this will be very helpful: #define MULTIPLE_ENUMS(my_enum, n) /* ^ will declare n enumerations using prefix "my_enum" and having concatenated 0 to n each. optional: having ALL the minimum value of each enum be 0 (easy) and maximum values for each multiplied by a magnitude of 2 starting from an initial value (which then becomes): #define MULTIPLE_ENUMS(my_enum, init, 5) */ i know this may sound trivial and totally beginner-like, but can anyone explain it to me, as i don't have the whole day just trying to decipher everything out.

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Test Reports for older Releases
by spam-receiver＠web.de 24 May '11

24 May '11

Hello! Where can I find the test results for older releases on the Boost homepage? I can only find the results for the current release under: http://www.boost.org/development/tests/release/developer/summary.html Thanks in advance, Thomas

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regular expression too complex
by Kraus Philipp 24 May '11

24 May '11

Hello, I'm generating a complex regular expression for removing word of textes, but now I get this exception: terminate called after throwing an instance of 'boost ::exception_detail ::clone_impl <boost::exception_detail::error_info_injector<std::runtime_error> >' what(): The complexity of matching the regular expression exceeded predefined bounds. Try refactoring the regular expression to make each choice made by the state machine unambiguous. This exception is thrown to prevent "eternal" matches that take an indefinite period time to locate. Is there a solution to create any removing operation? I have got a vector with strings and I must remove each element on the texts, so I create a regular expression with "or" and case-insensitive search ans use regex_replace to remove the words Thanks Phil

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Help needed with Boost header only libraries
by vikash sharma 24 May '11

24 May '11

Hi, Could anyone please help me out. I need boost header only libraries for boost shared pointer and boost foreach. But i am not able to find the header libraries available for download any where on the boost website. I remember seeing the header only libraries some time back. But right now dont see the header only libraries for any of the boost versions released till date. Regards, Vikash

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simple thread program hardtocompile/link with 1.46.1
by Eric Lin 24 May '11

24 May '11

Dear boost program(for c++,(or g++)): after I download 1.46.1 and try to baseon it to compile a simple program from book C++cookbook, at page 447, 12.1 Creating a Thread ---------- // example 12-1. Creating a thread #include <iostream> #include <boost/thread/thread.hpp> #include <boost/thread/xtime.hpp> struct MyThreadFunc { void operator()() { // Do something long-running... } } threadFun; int main() { boost::thread myThread(threadFun); // Create a thread that starts // running threadFun boost::thread::yield(); // give up the main thread's timeslice // so the child thread can get some work // done. // Go do some other work... myThread.join(); // The current (i.e., main) thread will wait // for myThread to finish before it returns } ----------------------------------------------------------- eric@eric-laptop:~/cppcookbook$ ls example12-1.cpp eric@eric-laptop:~/cppcookbook$ g++ -I/home/eric/boost1/boost_1_46_1/ example12-1.cpp -lboost_thread-mt /usr/bin/ld: cannot find -lboost_thread-mt collect2: ld returned 1 exit status eric@eric-laptop:~/cppcookbook$ g++ -I/home/eric/boost1/boost_1_46_1/ example12-1.cpp -lboost /usr/bin/ld: cannot find -lboost collect2: ld returned 1 exit status eric@eric-laptop:~/cppcookbook$ cd ../boost1/boost_1_46_1/ eric@eric-laptop:~/boost1/boost_1_46_1$ -------------------------- I am in Ubuntu linux 10.04, g++ 4.4.3 looking to see any suggestion and thanks a lot in advance, Eric Lin, Us citizen, in Los Angeles I am glad to meet anyone in Los Angeles on computer science meeting

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[Lambda, Function, etc] Is static dangerous?
by Robert Jones 24 May '11

24 May '11

Hi All Is it dangerous to write static Boost.Functions or Boost.Lamda placeholders in a multi-theaded context? I think that might be a really stoopid quesion - I'm just checking! Thx - Rob. eg, #include <boost/function.hpp> #include <boost/lambda/bind.hpp> void f( ) { namespace ll = boost::lambda; using boost::function; typedef std::pair<int, int> int_pair; static ll::placeholder1_type x; static function<int(const int_pair &)> second = ll::bind( & int_pair::second, x ); }

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Error C2039 using portable syntax for MultiIndex with Boost 1.34.1 on VC6
by tangleman＠secules.net 24 May '11

24 May '11

I am trying to use Boost Multi_Index from build 1.34.1 to set up a collection of structs. This Multi Index container will have 2 unique keys (ID and Name), since I have to be able to search it with either key. I made the compiler-specific corrections for VC++ 6.0 SP5: boost::multi_index::multi_index_container member_offset<A,int,offsetof(A,x)> My complete declaration is: struct ID(); struct Name(); typedef boost::multi_index::multi_index_container< PDCUTestMessage, boost::multi_index::ordered_unique< boost::multi_index::tag<ID>, boost::multi_index::member_offset<PDCUTestMessage, char, offsetof(PDCUTestMessage, id)> >, boost::multi_index::ordered_unique< boost::multi_index::tag<Name>, boost::multi_index::member_offset<PDCUTestMessage, string, offsetof(PDCUTestMessage, name)> > > > PDCUMessageList; Later, I attempt to set up indicies for both of these keys, according to VC++ 6.0 compiler-specific syntax to bypass the Get/Tag issue: typedef index<PDCUMessageList, ID>::type IDIndex; typedef index<PDCUMessageList, Name>::type NameIndex; Now the error. using the above code, I get the following error: error C2039: 'type': is not a member of "global namespace" referencing the two typedef lines above. I can't figure out what I am doing wrong? Quick responses are much appreciated! Thanks! Chris

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