Concept BidirectionalIteratorConcept

Iterator that can be both incremented and decremented.

/*!
 * @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="https://generic-prog
 * ramming.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>.
 */