RE: [Boost-users] BLL and member variables

Hi Mattias, What you want to do is perfectly doable with BLL in my opinion. However I am not sure of the exact syntax. For now, here is what you want to do using boost::bind instead of boost::lambda::bind. The header is . std::for_each(v.begin(), v.end(), boost::bind(&Map::insert, &m, boost::bind(&std::make_pair, boost::bind(&A::a_, _1), boost::bind(&A::b_, _1)))); or std::transform(v.begin(), v.end(), std::inserter(m, m.end()), boost::bind(&std::make_pair, boost::bind(&A::a_, _1), boost::bind(&A::b_, _1))); Both will do what you want. Cheers, -delfin

-----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users- bounces@lists.boost.org] On Behalf Of Mattias Brändström Sent: Monday, August 30, 2004 1:34 AM To: boost-users@lists.boost.org Subject: [Boost-users] BLL and member variables

Hello,

I really like the BLL and would like to use it as much as possible. I have run into a small problem though. My code looks like this:

#include #include

#include <map> #include <vector>

class A { public: A(int a, int b) : a_(a), b_(b) { } int a_; int b_; };

int main() { using namespace boost::lambda;

std::vector<A> v; v.push_back(A(1, 2));

typedef std::map Map; Map m;

for_each(v.begin(), v.end(), bind(&Map::insert, std::make_pair(bind(&A::a_, _1), bind(&A::b_, _1))));

return 0; }

What I want to do is to populate a map with the information from the vetctor v. For each element in v I want to insert a value and a key into the map something like this:

void operator()(const A& a) const { m_.insert(std::make_pair(a.a_, a.b_)); }

I found some information on how to use member variables as targets in the BLL documentation and that is what I have tried to use in the code above. It won't compile however, using g++ I get the following error:

g++ -c -o test.o test.cpp test.cpp: In function `int main()': test.cpp:27: error: no matching function for call to `bind(<unknown type>,

std::pair

...

, boost::tuples::tuple >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >,

boost::lambda::lambda_functor

...

, boost::tuples::tuple >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > > >)' scons: *** [test.o] Error 1 scons: building terminated because of errors.

If someone here has any ideas of how to accomplish this it would be really nice!

Thanks in advance!

Regards, Mattias _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users