young_project.hh

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#pragma once

#include "Algorithm.hh"
#include "YoungTab.hh"

namespace cadabra {

class young_project : public Algorithm {
    public:
        young_project(const Kernel&, Ex&);
        young_project(const Kernel&, Ex&, const std::vector<int>& shape, const std::vector<int>& indices);

        virtual bool     can_apply(iterator);
        virtual result_t apply(iterator&);      

        // Boxes represent tensor slots, the values in them
        // give the location in the tensor.
        typedef yngtab::filled_tableau<unsigned int> pos_tab_t;
        typedef yngtab::filled_tableau<iterator>     name_tab_t;
        pos_tab_t  tab;
        name_tab_t nametab;
        combin::symmetriser<unsigned int> sym;

        // Implicit antisymmetry; used by tableaux.cc only so far. These
        // store index locations, so these are "values" from the 
        // combinatorics.hh point of view.
        combin::combinations<unsigned int>::permuted_sets_t asym_ranges;
        bool remove_traces;

    private:
        iterator nth_index_node(iterator, unsigned int);
};

}