[range.cache.latest.view]

# 25 Ranges library [[ranges]](./#ranges)

## 25.7 Range adaptors [[range.adaptors]](range.adaptors#range.cache.latest.view)

### 25.7.34 Cache latest view [[range.cache.latest]](range.cache.latest#view)

#### 25.7.34.2 Class template cache_latest_view [range.cache.latest.view]

namespace std::ranges {template<[input_range](range.refinements#concept:input_range "25.4.6 Other range refinements [range.refinements]") V>requires [view](range.view#concept:view "25.4.5 Views [range.view]")<V>class [cache_latest_view](#lib:cache_latest_view "25.7.34.2 Class template cache_­latest_­view [range.cache.latest.view]") : public view_interface<cache_latest_view<V>> { V *base_* = V(); // *exposition only*using *cache-t* = conditional_t<is_reference_v<range_reference_t<V>>, // *exposition only* add_pointer_t<range_reference_t<V>>,
 range_reference_t<V>>; *non-propagating-cache*<*cache-t*> *cache_*; // *exposition only*// [[range.cache.latest.iterator]](range.cache.latest.iterator "25.7.34.3 Class cache_­latest_­view​::​iterator"), class cache_latest_view​::​*iterator*class *iterator*; // *exposition only*// [[range.cache.latest.sentinel]](range.cache.latest.sentinel "25.7.34.4 Class cache_­latest_­view​::​sentinel"), class cache_latest_view​::​*sentinel*class *sentinel*; // *exposition only*public: cache_latest_view() requires [default_initializable](concept.default.init#concept:default_initializable "18.4.12 Concept default_­initializable [concept.default.init]")<V> = default; constexpr explicit cache_latest_view(V base); constexpr V base() const & requires [copy_constructible](concept.copyconstructible#concept:copy_constructible "18.4.14 Concept copy_­constructible [concept.copyconstructible]")<V> { return *base_*; }constexpr V base() && { return std::move(*base_*); }constexpr auto begin(); constexpr auto end(); constexpr auto size() requires [sized_range](range.sized#concept:sized_range "25.4.4 Sized ranges [range.sized]")<V>; constexpr auto size() const requires [sized_range](range.sized#concept:sized_range "25.4.4 Sized ranges [range.sized]")<const V>; constexpr auto reserve_hint() requires [approximately_sized_range](range.approximately.sized#concept:approximately_sized_range "25.4.3 Approximately sized ranges [range.approximately.sized]")<V>; constexpr auto reserve_hint() const requires [approximately_sized_range](range.approximately.sized#concept:approximately_sized_range "25.4.3 Approximately sized ranges [range.approximately.sized]")<const V>; }; template<class R> cache_latest_view(R&&) -> cache_latest_view<views::all_t<R>>;}

[ð](#lib:cache_latest_view,constructor)

`constexpr explicit cache_latest_view(V base);
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L17425)

*Effects*: Initializes *base_* with std​::​move(base)[.](#1.sentence-1)

[ð](#lib:begin,cache_latest_view)

`constexpr auto begin();
`

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L17436)

*Effects*: Equivalent to: return *iterator*(*this);

[ð](#lib:end,cache_latest_view)

`constexpr auto end();
`

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L17447)

*Effects*: Equivalent to: return *sentinel*(*this);

[ð](#lib:size,cache_latest_view)

`constexpr auto size() requires [sized_range](range.sized#concept:sized_range "25.4.4 Sized ranges [range.sized]")<V>;
constexpr auto size() const requires [sized_range](range.sized#concept:sized_range "25.4.4 Sized ranges [range.sized]")<const V>;
`

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L17459)

*Effects*: Equivalent to: return ranges​::​size(*base_*);

[ð](#lib:reserve_hint,cache_latest_view)

`constexpr auto reserve_hint() requires [approximately_sized_range](range.approximately.sized#concept:approximately_sized_range "25.4.3 Approximately sized ranges [range.approximately.sized]")<V>;
constexpr auto reserve_hint() const requires [approximately_sized_range](range.approximately.sized#concept:approximately_sized_range "25.4.3 Approximately sized ranges [range.approximately.sized]")<const V>;
`

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L17471)

*Effects*: Equivalent to: return ranges​::​reserve_hint(*base_*);
