# std::ranges::transform_view<V,F>::sentinel

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< cpp‎ | ranges‎ | transform view

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

The return type of `transform_view::end` when the underlying view is not a `common_range`.

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

Typical implementation holds only one data member: a sentinel obtained from (possibly const-qualified) `V`.

### Member types

Member type | Definition
`Parent` (private) | const transform_view<V, F> if Const is `true`, otherwise transform_view<V, F>. The name is for exposition only
`Base` (private) | const V if Const is `true`, otherwise V. The name is for exposition only

### Member functions

(constructor) (C++20) | constructs a sentinel (public member function)
base (C++20) | returns the underlying sentinel (public member function)

### Non-member functions

operator== (C++20) | compares a sentinel with an iterator returned from `transform_view::begin` (function)
operator- (C++20) | computes the distance between a sentinel and an iterator returned from `transform_view::begin` (function)

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