operator[]
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## operator[]

### Function Details

    value_type_wrap operator[](difference_type _Off) const

Iterator index operator.

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.

#### Parameters

##### _Off

The valid index relative to this iterator.

#### Return Value

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.

### Class

db_vector_iterator

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