22 #include <boost/signals2.hpp>
29 namespace bs2 = boost::signals2;
39 template <
typename InputIterator>
40 std::vector<T>
operator()(InputIterator first, InputIterator last)
const
42 std::vector<T> result;
48 std::vector<T> this_slot_result = *first;
49 result.insert(result.end(), this_slot_result.begin(),
50 this_slot_result.end());
68 template <
typename InputIterator>
69 T
operator()(InputIterator first, InputIterator last)
const
84 "already been returned.");