Thanks Folks! I really appreciate the help! That's just what I needed. Graham On 8/13/07, Richard Dingwall <rdingwall@gmail.com> wrote:
The following appears to work (it compiles :)):
#include <boost/tuple/tuple.hpp> #include <boost/bind.hpp> #include <vector> #include <algorithm> #include <cassert>
template<int N, class tuple_type> inline typename boost::tuples::element<N, tuple_type>::type & get(tuple_type & t) { return boost::tuples::get<N>(t); }
int main(const int argc, const char ** argv) {
typedef boost::tuples::tuple<int, double> some_tuple;
std::vector<some_tuple> vec_of_some_tuples;
std::vector<some_tuple>::iterator result(std::find_if(vec_of_some_tuples.begin(), vec_of_some_tuples.end(), boost::bind(get<0, some_tuple>, ::_1) == 42));
assert(result != vec_of_some_tuples.end());
return 0; }
Where 42 is the item you're looking for. See this post for original get(): http://lists.boost.org/boost-users/2007/01/24529.php
Otherwise, use a map?
Richard
On 8/14/07, David Abrahams <dave@boost-consulting.com > wrote:
on Mon Aug 13 2007, "Graham Reitz" <graham.cpp-AT-gmail.com> wrote:
typedef boost::tuples::tuple<int,double> some_tuple;
std::vector<some_tuple> vec_of_some_tuples;
// ... stuff some data into the vector
// ... search for a specific int in the vector of some_tuple
What would be a good method, using an stl algorithm, to search through the vector above to match only the int portion of the tuple (ignoring the double)?
Use std::find with a boost::transform_iterator over a function returning the first member of the tuple, then extract the resulting iterator's base() iterator.
HTH,
-- Dave Abrahams Boost Consulting http://www.boost-consulting.com
The Astoria Seminar ==> http://www.astoriaseminar.com
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