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Boost MultiIndex container - using multiple composite keys
by Charitha Herath 26 Jul '06

26 Jul '06

Hi All, I'm new to this mailing list. I have been using the boost multi index container for a while. I now have requirement where I need to create multiple composite keys. The example 7 (composite keys example) in the multi index container documentation shows that it is possible to define multiple composite keys. But how do we use a specific composite key when searching the data. Does the container differentiate the composite keys using the key data types? Thanks, Charitha --------------------------------- How low will we go? Check out Yahoo! Messengers low PC-to-Phone call rates.

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shared_ptr and inheritance of the raw pointer
by Yossi.Itzkovich＠ecitele.com 26 Jul '06

26 Jul '06

Hi, I have this code: #include <boost/shared_ptr.hpp> class A{ // base class public: }; class B : public A{ public: int b1; }; typedef boost::shared_ptr<A> tSmartA; typedef boost::shared_ptr<B> tSmartB; void foo (tSmartB& smartOne) // should get a pointer to derived { } int main () { tSmartA a(new B); foo(a); // This line doesn't compile because foo expects to get tSmartB return 0; } How can I then send a to foo() ? Thanks Yossi

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[Lambda] find_if + vector of arrays
by Sohail Somani 25 Jul '06

25 Jul '06

Hi, Why can't lambda figure out the return type of operator[] for array? Does it know about vectors? I know I can fix the compile error by using bl::ret<double>(bl::_1[0])... But for obvious reasons, I'd much rather not! #include <vector> #include <algorithm> #include <boost/array.hpp> #include <boost/lambda/lambda.hpp> int main() { namespace bl=boost::lambda; using std::vector; using boost::array; array<double,3> cpy = {1}; vector<vector<double> > a(10,vector<double>(3,1)); vector<array<double,3> > b(10,cpy); std::find_if(a.begin(),a.end(),bl::_1[0]==5); std::find_if(b.begin(),b.end(),bl::_1[0]==5); } Thanks! Sohail

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Re: [Boost-users] [serialization] Skipping unexpected elements inXMLarchive
by Todd Greer 25 Jul '06

25 Jul '06

Robert Ramey wrote: > Sounds to me that others might find this useful. How about making a > little write up, and maybe a small test/demo, zipping it up and uploading > to the serialization section of the boost vault? I'll do that. Unfortunately, I noticed that I use putback twice in a row, which I understand is not guaranteed to work. I'm working on fixing that now, and will put the code in the vault once that's fixed. I've fixed a couple of other things as well, and will include those fixes in the vault upload. -- Todd Greer <tgreer <at> affinegy dot com> Senior Software Developer, Affinegy LLC

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reading data into vector/matirx
by Fred J. 25 Jul '06

25 Jul '06

dear boost users is there a library where it will take a file name and gives a vector/matrix of the data in the file. data formate is space delimited name age location hairColour thanks --------------------------------- Do you Yahoo!? Get on board. You're invited to try the new Yahoo! Mail Beta.

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Grep() question
by Winson Yung 25 Jul '06

25 Jul '06

Hello all, I have the following regular expression, but it doesn't match to this text "REVENUE ................................................... $10,481.1" const char* pattern[] = "Revenue[\s\.]*\$?\s*([0-9,\.]*)"; my code looks something like this: std::vector <unsigned int> v; boost::RegEx expr(pattern, true); v.clear(); unsigned int result = expr.Grep(v, pBuf); if (result != 0) { std::string s = expr[0]; s = expr[1]; ............ Why expr[0] and expr[1] weren't return the aboved mention text as the first match? I think set 'true' in expr constructor means do case insensitve match. /Winson.

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Newbie String Splitting Question
by Seth Nielson 25 Jul '06

25 Jul '06

Hi Two questions related to string tokenization. 1. Which is preferred? using "split" or the "tokenizer class"? 2. Both of these methods seem geared towards splitting on characters rather than splitting on substrings. Is there yet another method that is preferred for splitting a string on an exact substring? If I want to split "I<mark>Am<mark>A<mark>Test" into I, Am, A, Test, what is the best way? It seems that for split I'll have to write my own predicate, and for tokenizer, I'll have to write my own tokenizerFunction. -- Seth N.

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[shmem] compile time error with mingw (uint64_t)
by Sascha Lumma 25 Jul '06

25 Jul '06

Hi, Thats my second posting for this error, but in the first one I've done a error in reasoning. I get this error when I try to compile my application with mingw in Windows. ./boost/shmem/sync/xtime.hpp: In function `int boost::shmem::xtime_get(boost::shmem::xtime*, int)': ./boost/shmem/sync/xtime.hpp:91: error: integer constant is too large for "long" type The line which produce this error message is the following. static const boost::uint64_t timespec_to_filetime_offset = (boost::uint64_t)(116444736000000000); Firstly I thought that I've a configuration problem and uint64_t is defined with "long" or "unsigned long" and cannot hold this 64 bit constant, but it was wrong. uint64_t has just like the constant 64 bit - sizeof(boost::uint64_t) returns 8. If I replace boost::uint64_t with "unsigned long long" the same error occures. But unsigned has no sign bit and should hold exactly 64 bit values. I've absolutely no idea. What's wrong??? Thank you in advance for every reply, Sascha

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How to build only one library ?
by Hrvoje Ban 25 Jul '06

25 Jul '06

I'm using MinGW and I want to build only Pointer Container library but I can't find way to configure Boost build system (I'm using Jam). Also, I noticed that Jam builds eight version of each library, get it be configured to only make one or two version since I don't need the others?

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Re: [Boost-users] [Test] BOOST_*_COLLECTIONS
by Sohail Somani 25 Jul '06

25 Jul '06

Err. Nm. Brain fart... Const ostream! > -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Sohail Somani > Sent: Tuesday, July 25, 2006 10:00 AM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] [Test] BOOST_*_COLLECTIONS > > Sorry, I should have sent this email here: > --- > Hi, > > With the following test case: > > #include <boost/array.hpp> > > template<typename T,size_t N> > std::ostream operator<<(const std::ostream & os, const > boost::array<T,N> & arr) > { > os << "[ "; > for(size_t i = 0 ; i < N-1; ++i) > { > os << arr[i] << ", "; > } > os << arr[N-1] << " ]"; > return os; > } > > BOOST_AUTO_UNIT_TEST ( test_boost_test_array ) > { > boost::array<double,3> arr1[] = { > {{1,0,0}}, > {{1,2,2}} > }; > > boost::array<double,3> arr2[] = { > {{1,0,0}}, > {{1,2,2}} > }; > > BOOST_REQUIRE_EQUAL_COLLECTIONS(arr1,arr1+2, > arr2,arr2+2); > } > > I'm getting odd compile errors at this line: > > res.message() << "\nMismatch in a position " << pos << ": " > << *left_begin << " != " << *right_begin; > > gcc.compile.c++ bjam-build/gcc/release/unit_tests/data_utils.o > external/boost/include/boost/test/utils/wrap_stringstream.hpp: > In function âboost::basic_wrap_stringstream<CharT>& > boost::operator<<(boost::basic_wrap_stringstream<CharT>&, > const T&) [with CharT = char, T = boost::array<double, 3u>]â: > external/boost/include/boost/test/test_tools.hpp:495: > instantiated from âboost::test_tools::predicate_result > boost::test_tools::tt_detail::equal_coll_impl(Left, Left, > Right, Right) [with Left = boost::array<double, 3u>*, Right = > boost::array<double, 3u>*]â > unit_tests/data_utils.cpp:62: instantiated from here > external/boost/include/boost/test/utils/wrap_stringstream.hpp: > 66: error: no match for âoperator<<â in â(+ > targ)->boost::basic_wrap_stringstream<CharT>::stream [with > CharT = char]() << tâ > > What am I missing here? > > Sorry for the long email! > > TIA, > > Sohail > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

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