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self operator-(difference_type n) const
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<p>Iterator shuffle operator. </p>
<p>Return a new iterator by moving this iterator backward by n elements. </p>
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<p>The amount and direction of movement. If negative, will move towards reverse direction. </p>
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<p>A new iterator at new position. </p>
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difference_type operator-(const self &itr) const
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<p>Return the negative value of the difference of indices of elements this iterator and itr are sitting on. </p>
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<p>itr.index - this->index. </p>
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<p>Methods below only applies to random iterators.</p>
<p>/////</p>
<p>Return a new iterator by moving this iterator backward or forward by n elements. </p>
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