Here's a related stackoverflow question: http://stackoverflow.com/q/15102406
.
Note that at s_handle_from_iterator there's a "no viable conversion", it's
to be used with ordinary iterators obtained from fib_heap.begin().
2013/2/26 Francisco Lopes
I'm looking for a good data structure that can *maintain* its elements sorted. Currently I'm trying Boost.Heaphttp://www.boost.org/doc/libs/1_53_0/doc/html/heap.html .
I frequently need to orderly traverse the data structure, find a element based on some property and update its priority when it matches. Boost.Heap priority queues provide ordered and non-ordered iterators. Element updates occurs through a element handle, a handle can be obtained from a ordinary non-ordered iterator, but not directly from a ordered one as in the following example:
#include <iostream>#include <algorithm>#include
using namespace boost::heap; int main(){ fibonacci_heap<int> fib_heap; fib_heap.push(1); fib_heap.push(2); fib_heap.push(3);
for(auto i = fib_heap.ordered_begin(); i != fib_heap.ordered_end(); ++i) { auto h = fibonacci_heap<int>::s_handle_from_iterator(i); if(*h == 3) { fib_heap.increase(h, *h + 2); break; } }
std::for_each(fib_heap.ordered_begin(), fib_heap.ordered_end(), [](const int &e) { std::cout << e << std::endl; });}
How can I orderly traverse the queue and update an element in the traversal?
Note that I leave traversal after the update.
(Suggestions of alternative libraries for such purpose are welcome)