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 <boost/bind.hpp>. std::for_each(v.begin(), v.end(), boost::bind(&Map::insert, &m, boost::bind(&std::make_pair<Map::key_type, Map::mapped_type>, 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<Map::key_type, Map::mapped_type>, 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 <boost/lambda/bind.hpp> #include <boost/lambda/lambda.hpp>
#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<int, int> 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::lambda::lambda_functor<boost::lambda::lambda_functor_base <boost::lambda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified>
, boost::tuples::tuple<int A::*, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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::lambda::lambda_functor_base<boost::la mbda::action<2, boost::lambda::function_action<2, boost::lambda::detail::unspecified>
, boost::tuples::tuple<int A::*, const boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, 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