# std::ranges::enumerate_view<V>::iterator

From cppreference.com
< cpp‎ | ranges‎ | enumerate view

template< bool Const > class /*iterator*/ |  | (since C++23)

The return type of `enumerate_view::begin`, and of `enumerate_view::end` when the underlying view `V` is a `common_range`.

The type /*iterator*/<true> is returned by the const-qualified overloads. The type /*iterator*/<false> is returned by the non-const-qualified overloads.

The name of this class template (shown here as /*iterator*/) is unspecified.

### Data members

Typical implementations of /*iterator*/ hold two non-static data members:

- `current_` of type ranges::iterator_t<Base>, that holds an iterator to the current element;
- `pos_` of type `difference_type`, that holds current index.

These names are for exposition only.

### Member types

Member type | Definition
`Base` (private) | const V if Const is true, otherwise V. The name is for exposition only.
`iterator_category` | std::input_iterator_tag
`iterator_concept` | std::random_access_iterator_tag, if `Base` models `random_access_range`. Otherwise, std::bidirectional_iterator_tag, if `Base` models `bidirectional_range`. Otherwise, std::forward_iterator_tag, if `Base` models `forward_range`. Otherwise, std::input_iterator_tag.
`difference_type` | ranges::range_difference_t<Base>
`value_type` | std::tuple<difference_type, ranges::range_value_t<Base>>.
`reference-type` (private) | std::tuple<difference_type, ranges::range_reference_t<Base>>. The name is for exposition only.

### Member functions

(constructor) (C++23) | constructs an iterator (public member function)
base (C++23) | returns an iterator to current element (public member function)
index (C++23) | returns current index (public member function)
operator* (C++23) | accesses the element (public member function)
operator[] (C++23) | accesses an element by index (public member function)
operator++operator++(int)operator--operator--(int)operator+=operator-= (C++23) | advances or decrements the underlying iterator (public member function)

### Non-member functions

operator==operator<=> (C++23) | compares the underlying iterators (function)
operator+operator- (C++23) | performs iterator arithmetic (function)
iter_move (C++23) | casts the result of dereferencing the underlying iterator to its associated rvalue reference type (function)

### Example

| This section is incomplete Reason: no example

### References

- C++23 standard (ISO/IEC 14882:2023):

  - 26.7.23.3 Class template `enumerate_view::iterator` [range.enumerate.iterator]

### See also

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/ranges/enumerate_view/iterator&oldid=150747"