    // Copyright (C) 2005  Davis E. King (davis@dlib.net)
    // License: Boost Software License   See LICENSE.txt for the full license.
    #undef DLIB_STATIC_MAP_KERNEl_ABSTRACT_
    #ifdef DLIB_STATIC_MAP_KERNEl_ABSTRACT_

    #include "../interfaces/map_pair.h"
    #include "../interfaces/enumerable.h"
    #include "../interfaces/remover.h"
    #include "../serialize.h"
    #include <functional>

    namespace dlib
    {

        template <
            typename domain,
            typename range,
            typename compare = std::less<domain>
            >
        class static_map : public enumerable<map_pair<domain,range> >
        {

            /*!
                REQUIREMENTS ON domain
                    domain must be comparable by compare where compare is a functor compatible with std::less and
                    domain is swappable by a global swap() and
                    domain must have a default constructor

                REQUIREMENTS ON range
                    range is swappable by a global swap() and
                    range must have a default constructor

                POINTERS AND REFERENCES TO INTERNAL DATA
                    Only the destructor and load_from() will invalidate pointers or
                    references to internal data.

                INITIAL VALUE
                    size() == 0

                ENUMERATION ORDER
                    The enumerator will iterate over the domain (and each associated
                    range element) elements in ascending order according to the compare functor.
                    (i.e. the elements are enumerated in sorted order)

                WHAT THIS OBJECT REPRESENTS
                    static_map contains items of type domain and range

                    This object is similar an array.  It maps items of type domain on to
                    items of type range.

                    Also note that unless specified otherwise, no member functions
                    of this object throw exceptions.

                NOTE
                    definition of equivalent:
                    a is equivalent to b if
                    a < b == false and
                    b < a == false
            !*/

            public:

                typedef domain domain_type;
                typedef range range_type;
                typedef compare compare_type;

                static_map (
                );
                /*!
                    ensures
                        - #*this is properly initialized
                    throws
                        - std::bad_alloc or any exception thrown by domain's or range's
                          constructor.
                !*/

                virtual ~static_map(
                );
                /*!
                    ensures
                        - all memory associated with *this has been released
                !*/

                void clear(
                );
                /*!
                    ensures
                        - #*this has its initial value
                    throws
                        - std::bad_alloc or any exception thrown by domain's or range's
                          constructor.
                            If this exception is thrown then #*this is unusable
                            until clear() is called and succeeds.
                !*/

                void load (
                    pair_remover<domain,range>& source
                );
                /*!
                    ensures
                        - #size() == source.size()
                        - #source.size() == 0
                        - all the pairs in source are removed and placed into #*this
                        - #at_start() == true
                    throws
                        - std::bad_alloc or any exception thrown by domain's or range's
                          constructor.
                            If this exception is thrown then the call to load() will have
                            no effect on #*this.
                !*/

                const range* operator[] (
                    const domain& d
                ) const;
                /*!
                    ensures
                        - if (there is an element in the domain equivalent to d) then
                            - returns a pointer to an element in the range of *this that
                              is associated with an element in the domain of *this
                              equivalent to d.
                        - else
                            - returns 0
                !*/

                range* operator[] (
                    const domain& d
                );
                /*!
                    ensures
                        - if (there is an element in the domain equivalent to d) then
                            - returns a pointer to an element in the range of *this that
                              is associated with an element in the domain of *this
                              equivalent to d.
                        - else
                            - returns 0
                !*/

                void swap (
                    static_map& item
                );
                /*!
                    ensures
                        - swaps *this and item
                !*/

            private:

                // restricted functions
                static_map(static_map&);        // copy constructor
                static_map& operator=(static_map&);    // assignment operator
        };

        template <
            typename domain,
            typename range,
            typename compare
            >
        inline void swap (
            static_map<domain,range,compare>& a,
            static_map<domain,range,compare>& b
        ) { a.swap(b); }
        /*!
            provides a global swap function
        !*/

        template <
            typename domain,
            typename range,
            typename compare
            >
        void deserialize (
            static_map<domain,range,compare>& item,
            std::istream& in
        );
        /*!
            provides deserialization support
        !*/
    }

    #endif // DLIB_STATIC_MAP_KERNEl_ABSTRACT_