multiPriorityQueue.h

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 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
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#ifndef GUM_MULTI_PRIORITY_QUEUE_H
#define GUM_MULTI_PRIORITY_QUEUE_H
 
#include <functional>
#include <sstream>
#include <string>
#include <utility>
#include <vector>
 
#include <agrum/agrum.h>
 
#include <agrum/base/core/hashTable.h>
 
#include <initializer_list>
 
namespace gum {
 
#define GUM_MULTIPLE_PRIORITY_QUEUE_DEFAULT_CAPACITY 10
 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
  // templates provided by this file
  template < typename Val, typename Priority, typename Cmp >
  class MultiPriorityQueue;
 
  template < typename Val, typename Priority, typename Cmp >
  std::ostream& operator<<(std::ostream&, const MultiPriorityQueue< Val, Priority, Cmp >&);
 
#endif   // DOXYGEN_SHOULD_SKIP_THIS
 
  // ===========================================================================
  // ===                           PRIORITY QUEUES                           ===
  // ===========================================================================
  template < typename Val, typename Priority = int, typename Cmp = std::less< Priority > >
  class MultiPriorityQueue {
    public:
    using value_type      = Val;
    using reference       = Val&;
    using const_reference = const Val&;
    using pointer         = Val*;
    using const_pointer   = const Val*;
    using difference_type = std::ptrdiff_t;
 
 
    // ============================================================================
    // ============================================================================

    explicit MultiPriorityQueue(Cmp  compare  = Cmp(),
                                Size capacity = GUM_MULTIPLE_PRIORITY_QUEUE_DEFAULT_CAPACITY);

    explicit MultiPriorityQueue(std::initializer_list< std::pair< Val, Priority > > list);

    MultiPriorityQueue(const MultiPriorityQueue< Val, Priority, Cmp >& from);

    MultiPriorityQueue(MultiPriorityQueue< Val, Priority, Cmp >&& from);

    ~MultiPriorityQueue();

    // ============================================================================
    // ============================================================================

    MultiPriorityQueue< Val, Priority, Cmp >&
        operator=(const MultiPriorityQueue< Val, Priority, Cmp >& from);

    MultiPriorityQueue< Val, Priority, Cmp >&
        operator=(MultiPriorityQueue< Val, Priority, Cmp >&& from);

    const Val& operator[](Size index_elt) const;

    // ============================================================================
    // ============================================================================

    Size size() const noexcept;

    bool empty() const noexcept;

    bool contains(const Val& val) const;

    const Val& top() const;

    const Priority& topPriority() const;

    Val pop();

    Size insert(const Val& val, const Priority& priority);

    Size insert(Val&& val, Priority&& priority);

    template < typename... Args >
    Size emplace(Args&&... args);

    void eraseTop();

    void eraseByPos(Size index);

    void erase(const Val& val);

    Size setPriorityByPos(Size index, const Priority& new_priority);

    Size setPriorityByPos(Size index, Priority&& new_priority);

    void setPriority(const Val& elt, const Priority& new_priority);

    const Priority& priority(const Val& elt) const;

    void clear();

    const HashTable< Val, std::vector< Size > >& allValues() const;

    std::string toString() const;

    // ============================================================================
    // ============================================================================

    Size capacity() const noexcept;

    void resize(Size new_size);

 
    private:
    std::vector< std::pair< Priority, const Val* > > _heap_;

    HashTable< Val, std::vector< Size > > _indices_;

    Size _nb_elements_{0};

    Cmp _cmp_;
  };
 
} /* namespace gum */
 
 
#ifndef GUM_NO_EXTERN_TEMPLATE_CLASS
extern template class gum::MultiPriorityQueue< std::string >;
extern template class gum::MultiPriorityQueue< int, int >;
#endif
 
 
// always include the implementation of the templates
#include <agrum/base/core/multiPriorityQueue_tpl.h>
 
#endif /* GUM_MULTI_PRIORITY_QUEUE_H */