// ==========================================================================
//                 SeqAn - The Library for Sequence Analysis
// ==========================================================================
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//       notice, this list of conditions and the following disclaimer.
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// ==========================================================================
// Author: Manuel Holtgrewe <manuel.holtgrewe@fu-berlin.de>
// ==========================================================================

// SEQAN_NO_GENERATED_FORWARDS

#ifndef INCLUDE_SEQAN_BASIC_ITERATOR_CONCEPT_H_
#define INCLUDE_SEQAN_BASIC_ITERATOR_CONCEPT_H_

namespace seqan {

// Forward Declaration / Prototype.
template <typename T> struct Pointer;

/*!
 * @concept IteratorAssociatedTypesConcept
 * @headerfile <seqan/basic.h>
 * @brief Requires metafunctions for the associated types used in the iterator concepts.
 *
 * @signature IteratorAssociatedTypesConcept<T>
 *
 * The SeqAn iterators mirror the definitions from <a href="http://generic-programming.org/languages/conceptcpp/concept_web.php?header=iterator">ConceptC++</a>.
 */

/*!
 * @mfn IteratorAssociatedTypesConcept#Value
 * @brief The value type of the iterator (same as the value type of the underlying container).
 *
 * @signature Value<TIter>::Type
 *
 * @tparam TIter The <tt>TIter</tt> class to query for its value type.
 *
 * @return Type The value type of <tt>TIter</tt>
 */

/*!
 * @mfn IteratorAssociatedTypesConcept#GetValue
 * @brief The get-value type of the iterator (same as the get-value type of the underlying container).
 *
 * @signature GetValue<TIter>::Type
 *
 * @tparam TIter The <tt>TIter</tt> class to query for its get-value type.
 *
 * @return Type The get-value type of <tt>TIter</tt>
 */

/*!
 * @mfn IteratorAssociatedTypesConcept#Reference
 * @brief The reference type of the iterator (same as the reference type of the underlying container).
 *
 * @signature Reference<TIter>::Type
 *
 * @tparam TIter The <tt>TIter</tt> class to query for its reference type.
 *
 * @return Type The reference type of <tt>TIter</tt>
 */

/*!
 * @mfn IteratorAssociatedTypesConcept#Difference
 * @brief Returns the type for distances between two iterators.
 *
 * @signature Size<TContainer>::Type
 *
 * @tparam TContainer The Container type to query.
 * @return Type       The type to use for storing iterator distances sizes.
 *
 * This must be the same type as the distance type of the containers iterators.
 */

/*!
 * @mfn IteratorAssociatedTypesConcept#Pointer
 * @brief Returns pointer to an object, required for <tt>operator-></tt>, for example.
 *
 * @signature Pointer<TIter>::Type
 *
 * @tparam TIter The type to query.
 *
 * @return Type Pointer type.
 */

/*!
 * @fn IteratorAssociatedTypesConcept#operator*
 * @brief Returns reference to the pointed-to value.
 *
 * @signature TReference operator*(it);
 *
 * @param[in] it The iterator to dereference.
 *
 * @return TReference The reference type.
 */

/*!
 * @fn IteratorAssociatedTypesConcept#value
 * @brief Returns reference to the pointed-to value.
 * @deprecated Use <tt>operator*()</tt> instead.
 *
 * @signature TReference value(it);
 *
 * @param[in] it The iterator to dereference.
 *
 * @return TReference The reference type.
 */

/*!
 * @fn IteratorAssociatedTypesConcept#getValue
 * @brief Returns get-value of pointed-to character.
 * @deprecated Use <tt>operator*()</tt> instead.
 *
 * @signature TGetValue getValue(it);
 *
 * @param[in] it The iterator to get get-value from.
 *
 * @return TGetValue The get-value that is pointed to.
 */

SEQAN_CONCEPT(IteratorAssociatedTypesConcept, (T))
{
    typedef typename Value<T>::Type      TValue;
    typedef typename GetValue<T>::Type   TGetValue;
    typedef typename Difference<T>::Type TDifference;
    typedef typename Reference<T>::Type  TReference;
    typedef typename Pointer<T>::Type    TPointer;

    SEQAN_CONCEPT_ASSERT((SignedIntegerConcept<TDifference>));

    SEQAN_CONCEPT_USAGE(IteratorAssociatedTypesConcept)
    {
    }
};

/*!
 * @concept InputIteratorConcept
 * @extends IteratorAssociatedTypesConcept
 * @extends CopyConstructibleConcept
 * @extends EqualityComparableConcept
 * @headerfile <seqan/basic.h>
 * @brief Iterator that allows dereferenced reading.
 *
 * @signature InputIteratorConcept<T>
 *
 * The SeqAn iterators mirror the definitions from <a href="http://generic-programming.org/languages/conceptcpp/concept_web.php?header=iterator">ConceptC++</a>.
 *
 * @see OutputIteratorConcept
 */

/*!
 * @fn InputIteratorConcept#operator++(suffix)
 * @brief C++ built-in suffix increment operator.
 *
 * @signature TIterator operator++(it, i);
 *
 * @param[in,out] it The iterator to increment.
 * @param[in]     i  An integer, used to mark suffix decrement.
 *
 * @return TIterator A copy of the original iterator.
 */

/*!
 * @fn InputIteratorConcept#operator++(prefix)
 * @brief C++ built-in prefix increment operator.
 *
 * @signature TIterator operator++(it);
 *
 * @param[in] it The iterator to increment.
 *
 * @return TIterator A copy of the original iterator.
 */

/*!
 * @fn InputIteratorConcept#operator->
 * @brief C++ built-in structure dereference operator.
 *
 * @signature TResult operator->(it);
 *
 * @param[in] it The iterator to structure-dereference.
 *
 * @return TResult Either a pointer or another type.  If it is another type, the <tt>operator-></tt> is called
 *                 recursively.
 */

/*!
 * @fn InputIteratorConcept#goNext
 * @brief Iterates to next position.
 *
 * @signature void goNext(it);
 *
 * @param[in,out] it The iterator to increment.
 *
 * This function is equivalent to <tt>++iterator</tt>.
 */

SEQAN_CONCEPT_REFINE(InputIteratorConcept, (T), (IteratorAssociatedTypesConcept)(CopyConstructible)(EqualityComparable))
{
    typedef typename Value<T>::Type      TValue;
    typedef typename GetValue<T>::Type   TGetValue;
    typedef typename Difference<T>::Type TDifference;
    typedef typename Reference<T>::Type  TReference;
    typedef typename Pointer<T>::Type    TPointer;

    TValue v;
    T      x, y;

    SEQAN_CONCEPT_USAGE(InputIteratorConcept)
    {
        TReference & rv = v;
        T & rx =          x;

        SEQAN_CONCEPT_ASSERT((SignedIntegerConcept<TDifference>));
        // TODO(holtgrew): requires Convertible<reference, value_type>;
        // TODO(holtgrew): requires Convertible<pointer, cont value_type*>;

        // TODO(holtgrew): requires Dereferenceable<postincrement_result>;
        // TODO(holtgrew): requires requires Dereferenceable<postincrement_result>;

        // operator->: Cannot check this, need to know member for this.

        sameType(++x, rx);
        sameType(x++, y);
        goNext(x);

        sameType(rv, *x);

        x != x;
    }
};

/*!
 * @concept OutputIteratorConcept
 * @extends IteratorAssociatedTypesConcept
 * @extends CopyConstructibleConcept
 * @headerfile <seqan/basic.h>
 *
 * @brief Iterator that allows dereferenced writing.
 *
 * @signature OutputIteratorConcept<T>
 *
 * The SeqAn iterators mirror the definitions from <a href="http://generic-programming.org/languages/conceptcpp/concept_web.php?header=iterator">ConceptC++</a>. *
 *
 * @section Examples
 *
 * In the following, <tt>x</tt> is an iterator to type <tt>X</tt>, <tt>t</tt> is
 * a valid rvalue of type <tt>X</tt>.
 *
 * The following expressions must be valid.
 *
 * @code{.cpp}
 * *x = t     // Dereference assignment.
 * ++x        // Preincrement.
 * (void)x++  // Postincrement.
 * *x++ = t   // Postincrement and assign.
 *
 * assignValue(x, t);
 * @endcode
 *
 * @see InputIteratorConcept
 */

/*!
 * @fn OutputIteratorConcept#assignValue
 * @brief Assigns value to iterator.
 * @deprecated Use dereferencement and assignment instead.
 *
 * @signature void assignValue(it, value);
 *
 * @param[in,out] it    The iterator to assign value to.
 * @param[in]     value A value that is assigned to the item <tt>it</tt> points to.
 */

/*!
 * @fn OutputIteratorConcept#operator++(suffix)
 * @brief C++ built-in suffix increment operator.
 *
 * @signature TIterator operator++(it, i)
 *
 * @param[in,out] it The iterator to increment.
 * @param[in]     i  An integer, used to mark suffix decrement.
 *
 * @return TIterator A copy of the original iterator.
 */

/*!
 * @fn OutputIteratorConcept#operator++(prefix)
 * @brief C++ built-in prefix increment operator.
 *
 * @signature TIterator operator++(it)
 *
 * @param[in,out] it The iterator to increment.
 *
 * @return TIterator A copy of the original iterator.
 */

/*!
 * @fn OutputIteratorConcept#goNext
 * @brief Iterates to next position.
 *
 * @signature void goNext(it);
 *
 * @param[in,out] it The iterator to increment.
 *
 * This function is equivalent to <tt>++iterator</tt>.
 */

SEQAN_CONCEPT_REFINE(OutputIteratorConcept, (T), (CopyConstructible))
{
    typedef typename Value<T>::Type TValue;

    SEQAN_CONCEPT_ASSERT((Is<Assignable<TValue> >));

    T      x;
    TValue v;

    SEQAN_CONCEPT_USAGE(OutputIteratorConcept)
    {
        *x = v;
        assignValue(x, v);
        value(x) = v;

        ++x;
        ignoreUnusedVariableWarning(x++);
        goNext(x);
        *x++ = v;

        ignoreUnusedVariableWarning(x);
    }
};

/*!
 * @concept ForwardIteratorConcept
 * @extends InputIteratorConcept
 * @extends DefaultConstructibleConcept
 * @headerfile <seqan/basic.h>
 * @brief Iterator that allows passing over a linear sequence multiple times.
 *
 * @signature ForwardIteratorConcept<T>
 *
 * The SeqAn iterators mirror the definitions from <a href="http://generic-programming.org/languages/conceptcpp/concept_web.php?header=iterator">ConceptC++</a>.
 *
 * @section Examples
 *
 * In the following, <tt>x</tt> is an iterator to type <tt>X</tt>.
 *
 * The following expressions must be valid.
 *
 * @code{.cpp}
 * ++x  // Preincrement.
 * x++  // Postincrement.
 * @endcode
 */

SEQAN_CONCEPT_REFINE(ForwardIteratorConcept, (T), (InputIteratorConcept)(DefaultConstructible))
{
    typedef typename Value<T>::Type TValue;

    T x;

    SEQAN_CONCEPT_USAGE(ForwardIteratorConcept)
    {
        ++x;
        ignoreUnusedVariableWarning(*x++);
    }
};

/*!
 * @concept MutableForwardIteratorConcept
 * @extends ForwardIteratorConcept
 * @extends OutputIteratorConcept
 * @headerfile <seqan/basic.h>
 *
 * @brief A @link ForwardIteratorConcept Forward Iterator @endlink that allows dereferenced assignment.
 *
 * The SeqAn iterators mirror the definitions from <a href="http://generic-programming.org/languages/conceptcpp/concept_web.php?header=iterator">ConceptC++</a>.
 */

SEQAN_CONCEPT_REFINE(MutableForwardIteratorConcept, (T), (ForwardIteratorConcept)(OutputIteratorConcept))
{
    typedef typename Value<T>::Type      TValue;

    T      x;
    TValue v;

    SEQAN_CONCEPT_USAGE(MutableForwardIteratorConcept)
    {
        *x = v;
    }
};

/*!
 * @concept BidirectionalIteratorConcept
 *
 * @headerfile <seqan/basic.h>
 *
 * @extends ForwardIteratorConcept
 *
 * @brief Iterator that can be both incremented and decremented.
 *
 * @signature BidirectionalIteratorConcept<T>
 *
 * The SeqAn iterators mirror the definitions from <a href="http://generic-programming.org/languages/conceptcpp/concept_web.php?header=iterator">ConceptC++</a>.
 *
 * @section Examples
 *
 * In the following, <tt>x</tt> is an iterator to type <tt>X</tt>.
 *
 * The following expressions must be valid.
 *
 * @code{.cpp}
 * --x  // Predecrement.
 * x--  // Postdecrement.
 * @endcode
 */

/*!
 * @fn BidirectionalIteratorConcept#operator--(prefix)
 * @brief C++ built-in prefix decrement operator.
 *
 * @signature TIterator operator--(it);
 *
 * @param[in,out] it The iterator to increment.
 *
 * @return TIterator Reference to the incremented iterator.
 */

/*!
 * @fn BidirectionalIteratorConcept#operator--(suffix)
 * @brief C++ built-in suffix decrement operator.
 *
 * @signature TIterator operator--(it, i);
 *
 * @param[in,out] it The iterator to increment.
 * @param[in]     i  An int value to mark the operator as suffix decrement.
 *
 * @return TIterator Reference to the incremented iterator.
 */

/*!
 * @fn BidirectionalIteratorConcept#goPrevious
 * @brief Iterates to pevious position.
 *
 * @signature void goPrevious(it);
 *
 * @param[in,out] it Iterator to move to previous position.
 *
 * This function is equivalent to <tt>--iterator</tt>.
 */

SEQAN_CONCEPT_REFINE(BidirectionalIteratorConcept, (T), (ForwardIteratorConcept))
{
    T x;

    SEQAN_CONCEPT_USAGE(BidirectionalIteratorConcept)
    {
        --x;
        x--;
        goPrevious(x);
    }
};

/*!
 * @concept MutableBidirectionalIteratorConcept
 * @extends BidirectionalIteratorConcept
 * @brief Bidirectional iterator that also allows writing of dereferenced values.
 * @headerfile <seqan/basic.h>
 *
 * @signature MutableBidirectionalIteratorConcept<T>
 */

SEQAN_CONCEPT_REFINE(MutableBidirectionalIteratorConcept, (T), (BidirectionalIteratorConcept)(MutableForwardIteratorConcept))
{
    typedef typename Value<T>::Type TValue;

    T      x;
    TValue v;

    SEQAN_CONCEPT_USAGE(MutableBidirectionalIteratorConcept)
    {
        *x = v;
    }
};

/*!
 * @concept RandomAccessIteratorConcept
 * @extends BidirectionalIteratorConcept
 * @extends LessThanComparableConcept
 * @brief An iterator allowing random access.
 * @headerfile <seqan/basic.h>
 *
 * @signature RandomAccessIteratorConcept<T>
 *
 * This function is equivalent to <tt>--iterator</tt>.
 *
 * @section Examples
 *
 * In the following, <tt>x</tt> is an iterator to type <tt>X</tt>, <tt>t</tt> is
 * a valid rvalue of type <tt>X</tt>, <tt>n</tt> is a distance type.
 *
 * The following expressions must be valid.
 *
 * @code{.cpp}
 * x += n    // Iterator addition assignment.
 * x + n     // Iterator addition.
 * n + i     // Iterator addition.
 * x -= n    // Iterator subtraction assignment.
 * x - n     // Iterator subtraction.
 * x - a     // Difference.
 * x[n]      // Element operator.
 * @endcode
 */

/*!
 * @mfn RandomAccessIteratorConcept#Difference
 * @brief Type of an object that stores the difference between two iterators.
 *
 * @signature Difference<T>::Type
 *
 * @tparam T Type for which the difference type is determined.
 *
 * @return Type The difference type.
 *
 * In most cases this type is <tt>ptrdiff_t</tt>.
 */

/*!
 * @fn RandomAccessIteratorConcept#difference
 * @brief The difference between two iterators.
 *
 * @signature TDifference difference(begin, end);
 *
 * @param[in] begin Iterator to the first position of a range.
 * @param[in] end   Iterator behind the last position of a range.
 *
 * @return TDifference Length of the range between <tt>begin</tt> and <tt>end</tt>, type from
 *
 * This function is equivalent to <tt>end - begin</tt>.
 *
 * Usually, <tt>begin</tt> and <tt>end</tt> have the same type.
 */

/*!
 * @fn RandomAccessIteratorConcept#operator+=
 * @brief C++ built-in addition assignment operator.
 *
 * @signature TIterator operator+=(it, diff);
 */

/*!
 * @fn RandomAccessIteratorConcept#operator+
 * @brief C++ built-in addition operator.
 *
 * @signature TIterator operator+(lhs, rhs);
 */

/*!
 * @fn RandomAccessIteratorConcept#operator-=
 * @brief C++ built-in subtraction assignment operator.
 *
 * @signature TIterator operator-=(it, diff);
 */

/*!
 * @fn RandomAccessIteratorConcept#goNil
 * @brief Moves iterator to nil position.
 *
 * @signature void goNil(it);
 *
 * @param[in,out] it The iterator that will be moved.
 *
 * <tt>it</tt> is set to an invalid position, e.g. <tt>NULL</tt> for pointer types.
 */

/*!
 * @fn RandomAccessIteratorConcept#goFurther
 * @brief Iterates some steps further.
 *
 * @signature void goFurther(iterator, steps);
 *
 * @param[in,out] it    The iterator to move.
 * @param[in]     steps Number of steps <tt>iterator</tt> should be moved further.
 *
 * This function is equivalent to <tt>iterator += steps</tt>.
 */

/*!
 * @fn RandomAccessIteratorConcept::operator[]
 * @brief C++ built-in array subscript operator.
 *
 * @signature TReference TIterator::operator[](pos);
 *
 * @tparam TReference The referenced element.
 *
 * @param[in] pos Position to get element at.
 */

/*!
 * @fn RandomAccessIteratorConcept#atNil
 * @brief Tests whether iterator is at nil position.
 *
 * @signature bool atNil(it);
 *
 * @param[in] it The iterator to query.
 *
 * @return bool Whether or not the iterator is at the nil positions (NULL for pointers).
 */

SEQAN_CONCEPT_REFINE(RandomAccessIteratorConcept, (T), (BidirectionalIteratorConcept)(LessThanComparable))
{
    typedef typename Difference<T>::Type TDifference;
    typedef typename Value<T>::Type      TValue;

    T           x, y, a;
    TValue      t;
    TDifference n;

    SEQAN_CONCEPT_USAGE(RandomAccessIteratorConcept)
    {

        x += n;
        goFurther(x, n);
        ignoreUnusedVariableWarning(x + n);
        ignoreUnusedVariableWarning(n + x);
        x -= n;
        y = x - n;
        n = x - a;
        n = difference(x, a);
        ignoreUnusedVariableWarning(x[n]);

        ignoreUnusedVariableWarning(x);
        ignoreUnusedVariableWarning(y);
    }
};

/*!
 * @concept MutableRandomAccessIteratorConcept
 * @extends RandomAccessIteratorConcept
 * @headerfile <seqan/basic.h>
 * @brief A random access iterator whose dereferenced values can be assigned.
 *
 * @signature MutableRandomAccessIteratorConcept<T>
 */

SEQAN_CONCEPT_REFINE(MutableRandomAccessIteratorConcept, (T), (RandomAccessIteratorConcept)(MutableBidirectionalIteratorConcept))
{
    typedef typename Difference<T>::Type TDifference;
    typedef typename Value<T>::Type      TValue;

    T           x;
    TValue      t;
    TDifference n;

    SEQAN_CONCEPT_USAGE(MutableRandomAccessIteratorConcept)
    {
        value(x, n) = t;  // TODO(holtgrew): Not supported?
        x[n] = t;
    }
};

/*!
 * @concept RootedIteratorConcept
 * @extends ForwardIteratorConcept
 * @brief Iterator that knows its container.
 *
 * @signature RootedIteratorConcept<T>
 */

/*!
 * @mfn RootedIteratorConcept#Container
 * @brief Metafunction that returns the container of an iterator.
 *
 * @signature Container<TIterator>::Type
 *
 * @tparam TIterator The type of the iterator to query for its container.
 *
 * @return Type The type of the container for <tt>TIterator</tt>
 */

/*!
 * @fn RootedIteratorConcept#container
 * @brief Returns the container.
 *
 * @signature TContainer container(it);
 *
 * @param[in] it The iterator to get the container of.
 *
 * @return TContainer The container of the iterat.r
 */
// TODO(holtgrew): Need to document Reference_ and Parameter_.

/*!
 * @fn RootedIteratorConcept#atBegin
 * @brief Queries whether the rooted iterator is at the beginning of the container or not.
 *
 * @signature bool atBegin(it);
 *
 * @param[in] it The rooted iterator to query.
 *
 * @return bool Whether or not the iterator is at the beginning.
 */

/*!
 * @fn RootedIteratorConcept#atEnd
 * @brief Queries whether the rooted iterator is at the end of the container or not.
 *
 * @signature bool atEnd(it);
 *
 * @param[in] it The rooted iterator to query.
 *
 * @return bool Whether or not the iterator is at the end.
 */

SEQAN_CONCEPT_REFINE(RootedIteratorConcept, (T), (IteratorAssociatedTypesConcept))
{
    typedef typename Container<T>::Type TContainer;

    T x;

    SEQAN_CONCEPT_USAGE(RootedIteratorConcept)
    {
        T xs;
        ignoreUnusedVariableWarning(xs);

        TContainer & c = container(x);
        atBegin(x);
        atEnd(x);
        ignoreUnusedVariableWarning(c);
    }
};


/*!
 * @concept MutableRootedIteratorConcept
 * @extends RootedIteratorConcept
 * @extends MutableForwardIteratorConcept
 * @brief Rooted iterator that allows mutation after dereferencing.
 *
 * @signature MutableRootedIteratorConcept<T>
 */

SEQAN_CONCEPT_REFINE(MutableRootedIteratorConcept, (T), (RootedIteratorConcept)(MutableForwardIteratorConcept))
{
    SEQAN_CONCEPT_USAGE(MutableRootedIteratorConcept)
    {
    }
};

/*!
 * @concept RootedRandomAccessIteratorConcept
 * @extends RootedIteratorConcept
 * @extends RandomAccessIteratorConcept
 * @brief Rooted iterator with random access.
 *
 * @signature RootedRandomAccessIteratorConcept<T>
 */

/*!
 * @mfn RootedRandomAccessIteratorConcept#Position
 * @brief Metafunction to get Position type of a rooted random access iterator.
 *
 * @signature Position<TIter>::Type
 *
 * @tparam TIter Iterator to query for its position type.
 *
 * @return Type The position type of the iterator.
 */

/*!
 * @fn RootedRandomAccessIteratorConcept#position
 * @brief Function to get the position of a rooted random access iterator.
 *
 * @signature TPosition position(it);
 *
 * @param[in] it The iterator to query for its position.
 *
 * @return TPosition The position of <tt>it</tt>
 */

/*!
 * @fn RootedRandomAccessIteratorConcept#setPosition
 * @brief Set position of a rooted random access iterator.
 *
 * @signature void setPosition(it, pos);
 *
 * @param[in,out] it  The iterator to set the position of.
 * @param[in]     pos The position to set <tt>it</tt> to.
 */

/*!
 * @fn RootedRandomAccessIteratorConcept#goBegin
 * @brief Set position of rooted random access iterator to the beginning of the container.
 *
 * @signature void goBegin(it);
 *
 * @param[in,out] it  The iterator to set the position of.
 */

/*!
 * @fn RootedRandomAccessIteratorConcept#goEnd
 * @brief Set position of rooted random access iterator to the end of the container.
 *
 * @signature void goEnd(it, pos);
 *
 * @param[in,out] it  The iterator to set the position of.
 */

SEQAN_CONCEPT_REFINE(RootedRandomAccessIteratorConcept, (T), (RootedIteratorConcept)(RandomAccessIteratorConcept))
{
    typedef typename Position<T>::Type TPosition;

    SEQAN_CONCEPT_USAGE(RootedRandomAccessIteratorConcept)
    {
        T x;

        TPosition p = position(x);
        setPosition(x, p);
        goBegin(x);
        goEnd(x);
    }
};

/*!
 * @concept MutableRootedRandomAccessIteratorConcept
 * @extends RootedRandomAccessIteratorConcept
 * @extends MutableBidirectionalIteratorConcept
 * @brief Rooted iterator with random access that allows the mutation of dereferenced value.
 *
 * @signature RootedRandomAccessIteratorConcept<T>
 */

SEQAN_CONCEPT_REFINE(MutableRootedRandomAccessIteratorConcept, (T), (RootedRandomAccessIteratorConcept)(MutableBidirectionalIteratorConcept))
{
    SEQAN_CONCEPT_USAGE(MutableRootedRandomAccessIteratorConcept)
    {
    }
};

}  // namespace seqan

#endif  // #ifndef INCLUDE_SEQAN_BASIC_ITERATOR_CONCEPT_H_
