# std::ranges::join_view<V>::sentinel

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< cpp‎ | ranges‎ | join view

template< bool Const > class /*sentinel*/ |  | (since C++20) (exposition only*)

The return type of `join_view::end` when either of the underlying ranges (`V` or ranges::range_reference_t<V>) is not a `common_range`, or when the parent `join_view` is not a `forward_range`.

If `V` is not a simple view, `Const` is true for sentinels returned from the const overloads, and false otherwise. If `V` is a simple view, `Const` is true.

Typical implementation holds only one data member:

- `end_` (exposition only*) - A sentinel obtained from (possibly const-qualified) `V`.

### Member types

Member type | Definition
`Parent` | const ranges::join_view<V> if Const is true, otherwise ranges::join_view<V> (exposition only*)
`Base` | const V if Const is true, otherwise V (exposition only*)

### Member functions

(constructor) (C++20) | constructs a sentinel (public member function)

### Non-member functions

operator== (C++20) | compares a sentinel with an iterator returned from `join_view::begin` (function)

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