deduction guides for std::span

 

C++

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Concepts library (C++20)

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Technical Specifications

 

Containers library

array (C++11)

vector

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list

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unordered_map (C++11)

unordered_multimap (C++11)

stack

queue

priority_queue

span (C++20)

 

std::span

Member functions

span::span

span::operator=

Element access

span::front

span::back

span::operator[]

span::data

Iterators

span::beginspan::cbegin

span::endspan::cend

span::rbeginspan::crbegin

span::rendspan::crend

Observers

span::empty

span::size

span::size_bytes

Subviews

span::first

span::last

span::subspan

Non-member functions

as_bytesas_writable_bytes

begin(std::span)end(std::span)

get

Non-member constant

dynamic_extent

Helper classes

tuple_size

tuple_element

Deduction guides

 

Defined in header <span>
template<class T, std::size_t N> span(T (&)[N]) -> span<T, N>;	(1)
template<class T, std::size_t N> span(std::array<T, N>&) -> span<T, N>;	(2)
template<class T, std::size_t N> span(const std::array<T, N>&) -> span<const T, N>;	(3)
template<class Container> span(Container&) -> span<typename Container::value_type>;	(4)
template<class Container> span(const Container&) -> span<const typename Container::value_type>;	(5)

Five deduction guides are provided for span.

(1-3) allow the static extent to be deduced from built-in arrays and std::array.

(4-5) allow the element type to be deduced from containers that supply a nested type value_type.