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value_type_wrap operator[](difference_type _Off) const
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<p>Iterator index operator. </p>
<p>If _Off not in a valid range, the returned value will be invalid. Note that you should use a value_type_wrap type to hold the returned value. </p>
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<p>The valid index relative to this iterator. </p>
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<p>Return the element which is at position *this + _Off, which is an ElementRef<T> object if T is a class type or an ElementHolder<T> object if T is a C++ primitive data type. The returned value can be used to read or update its referenced element. </p>
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