    // Copyright (C) 2008  Davis E. King (davis@dlib.net)
    // License: Boost Software License   See LICENSE.txt for the full license.
    #undef DLIB_STD_VECTOr_C_ABSTRACT_H_
    #ifdef DLIB_STD_VECTOr_C_ABSTRACT_H_

    #include <vector>
    #include <algorithm>
    #include "../assert.h"

    namespace dlib
    {

        template <
            typename T,
            typename Allocator = std::allocator<T>
            >
        class std_vector_c : public std::vector<T,Allocator>
        {
            /*!
                WHAT THIS OBJECT REPRESENTS
                    This object is a simple wrapper around the std::vector object.  It
                    provides an identical interface but also checks the preconditions of
                    each member function.  That is, if you violate a requires
                    clause the dlib::fatal_error exception is thrown.
            !*/

            typedef typename std::vector<T,Allocator> base_type;
        public:
            typedef typename Allocator::reference         reference;
            typedef typename Allocator::const_reference   const_reference;
            typedef typename base_type::iterator          iterator;
            typedef typename base_type::const_iterator    const_iterator;
            typedef typename base_type::size_type         size_type;
            typedef typename base_type::difference_type   difference_type;
            typedef T                                     value_type;
            typedef Allocator                             allocator_type;
            typedef typename Allocator::pointer           pointer;
            typedef typename Allocator::const_pointer     const_pointer;
            typedef std::reverse_iterator<iterator>       reverse_iterator;
            typedef std::reverse_iterator<const_iterator> const_reverse_iterator;

            explicit std_vector_c(
                const Allocator& alloc = Allocator()
            );
            /*!
                ensures
                    - #get_allocator() == alloc
                    - #size() == 0
            !*/

            explicit std_vector_c (
                size_type n,
                const T& value = T(),
                const Allocator& alloc = Allocator()
            );
            /*!
                ensures
                    - #size() == n
                    - #get_allocator() == alloc
                    - for all valid i:
                        - (*this)[i] == value
            !*/

            template <typename InputIterator>
            std_vector_c (
                InputIterator first,
                InputIterator last,
                const Allocator& alloc = Allocator()
            );
            /*!
                ensures
                    - #size() == std::distance(first,last)
                    - #get_allocator() == alloc
                    - std::equal(first, last, begin()) == true
            !*/

            std_vector_c(
                const std::vector<T,Allocator>& x
            );
            /*!
                ensures
                    - #*this == x
            !*/

            std_vector_c<T,Allocator>& operator= (
                const std::vector<T,Allocator>& x
            );
            /*!
                ensures
                    - #*this == x
                    - returns #*this
            !*/

            template <typename InputIterator>
            void assign(
                InputIterator first,
                InputIterator last
            );
            /*!
                ensures
                    - #size() == std::distance(first,last)
                    - std::equal(first, last, begin()) == true
            !*/

            void assign(
                size_type n,
                const T& value
            );
            /*!
                ensures
                    - #size() == n
                    - for all valid i:
                        - (*this)[i] == value
            !*/

            allocator_type get_allocator(
            ) const;
            /*!
                ensures
                    - returns the allocator used by this vector
            !*/

            iterator begin(
            );
            /*!
                ensures
                    - if (size() > 0) then
                        - returns an iterator referring to the first element in
                          this container.
                    - else
                        - returns end()
            !*/

            const_iterator begin(
            ) const;
            /*!
                ensures
                    - if (size() > 0) then
                        - returns a const_iterator referring to the first element in
                          this container.
                    - else
                        - returns end()
            !*/

            iterator end(
            );
            /*!
                ensures
                    - returns an iterator that represents one past the end of
                      this container
            !*/

            const_iterator end(
            ) const;
            /*!
                ensures
                    - returns an iterator that represents one past the end of
                      this container
            !*/

            reverse_iterator rbegin(
            );
            /*!
                ensures
                    - returns std::reverse_iterator(end())
            !*/

            const_reverse_iterator rbegin(
            ) const;
            /*!
                ensures
                    - returns std::reverse_iterator(end())
            !*/

            reverse_iterator rend(
            );
            /*!
                ensures
                    - returns std::reverse_iterator(begin())
            !*/

            const_reverse_iterator rend(
            ) const;
            /*!
                ensures
                    - returns std::reverse_iterator(begin())
            !*/

            size_type size(
            ) const;
            /*!
                ensures
                    - returns end()-begin()
                      (i.e. returns the number of elements in this container)
            !*/

            size_type max_size(
            ) const;
            /*!
                ensures
                    - returns the maximum number of elements this vector can contain
            !*/

            void resize(
                size_type sz,
                T c = T()
            );
            /*!
                ensures
                    - #size() == sz
                    - any element with index between 0 and sz - 1 which was in the
                      vector before the call to resize() retains its value and index.
                      All other elements have a value given by c.
            !*/

            size_type capacity(
            ) const;
            /*!
                ensures
                    - returns the total number of elements that the vector can hold without
                      requiring reallocation.
            !*/

            bool empty(
            ) const;
            /*!
                ensures
                    - if (size() == 0) then
                        - returns true
                    - else
                        - returns false
            !*/

            void reserve(
                size_type n
            );
            /*!
                ensures
                    - #capacity() >= n
            !*/

            const_reference at(
                size_type n
            ) const;
            /*!
                ensures
                    - if (n < size()) then
                        - returns a const reference to (*this)[n]
                    - else
                        - throws std::out_of_range
            !*/

            reference at(
                size_type n
            );
            /*!
                ensures
                    - if (n < size()) then
                        - returns a reference to (*this)[n]
                    - else
                        - throws std::out_of_range
            !*/

            void push_back(
                const T& x
            );
            /*!
                ensures
                    - #size() == size() + 1
                    - #back() == x
            !*/

            void swap(
                std_vector_c<T,Allocator>& x
            );
            /*!
                ensures
                    - swaps the state of *this and x
            !*/

            void clear(
            );
            /*!
                ensures
                    - #size() == 0
            !*/

            reference operator[](
                size_type n
            );
            /*!
                requires
                    - n < size()
                ensures
                    - returns a reference to the nth element of this container
            !*/

            const_reference operator[](
                size_type n
            ) const;
            /*!
                requires
                    - n < size()
                ensures
                    - returns a const reference to the nth element of this container
            !*/

            reference front(
            );
            /*!
                requires
                    - size() > 0
                ensures
                    - returns a reference to (*this)[0]
            !*/

            const_reference front(
            ) const;
            /*!
                requires
                    - size() > 0
                ensures
                    - returns a const reference to (*this)[0]
            !*/

            reference back(
            );
            /*!
                requires
                    - size() > 0
                ensures
                    - returns a reference to (*this)[size()-1]
            !*/

            const_reference back(
            ) const;
            /*!
                requires
                    - size() > 0
                ensures
                    - returns a const reference to (*this)[size()-1]
            !*/

            void pop_back(
            );
            /*!
                requires
                    - size() > 0
                ensures
                    - #size() == size() - 1
                    - removes the last element in the vector but leaves the others
                      unmodified.
            !*/

            iterator insert(
                iterator position,
                const T& x
            );
            /*!
                requires
                    - begin() <= position && position <= end()
                      (i.e. position references an element in this vector object)
                ensures
                    - #size() == size() + 1
                    - inserts a copy of x into *this before the given position
                    - returns an iterator that points to the copy of x inserted
                      into *this
            !*/

            void insert(
                iterator position,
                size_type n,
                const T& x
            );
            /*!
                requires
                    - begin() <= position && position <= end()
                      (i.e. position references an element in this vector object)
                ensures
                    - #size() == size() + n
                    - inserts n copies of x into *this before the given position
            !*/

            template <typename InputIterator>
            void insert(
                iterator position,
                InputIterator first,
                InputIterator last
            );
            /*!
                requires
                    - begin() <= position && position <= end()
                      (i.e. position references an element in this vector object)
                    - first and last are not iterators into *this
                ensures
                    - #size() == size() + std::distance(last,first)
                    - inserts copies of the range of elements [first,last) into *this
                      before the given position
            !*/

            iterator erase(
                iterator position
            );
            /*!
                requires
                    - begin() <= position && position < end()
                      (i.e. position references an element in this vector object)
                ensures
                    - #size() == size() - 1
                    - removes the element in this vector referenced by position but
                      leaves all other elements in this vector unmodified.
                    - if (position < end()-1) then
                        - returns an iterator referencing the element immediately
                          following *position prior to the erase.
                    - else
                        - returns end()
            !*/

            iterator erase(
                iterator first,
                iterator last
            );
            /*!
                requires
                    - begin() <= first && first <= last && last <= end()
                      (i.e. the range [first,last) must be inside this container )
                ensures
                    - #size() == size() - (last-first)
                    - removes the elements in this vector referenced by the
                      iterator range [first,last) but leaves all other elements
                      in this vector unmodified.
                    - if (last < end()-1) then
                        - returns an iterator referencing the element immediately
                          following *last prior to the erase.
                    - else
                        - returns end()
            !*/

        };

    // ----------------------------------------------------------------------------------------

        template <typename T, typename alloc>
        void serialize (
            const std_vector_c<T,alloc>& item,
            std::ostream& out
        );
        /*!
            provides serialization support
        !*/

    // ----------------------------------------------------------------------------------------

        template <typename T, typename alloc>
        void deserialize (
            std_vector_c<T, alloc>& item,
            std::istream& in
        );
        /*!
            provides deserialization support
        !*/

    // ----------------------------------------------------------------------------------------

    }

    #endif // DLIB_STD_VECTOr_C_ABSTRACT_H_