std::as_bytes, std::as_writable_bytes

 

C++

Language

Standard Library Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Containers library

array (C++11)

vector

deque

forward_list (C++11)

list

set

multiset

map

multimap

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

stack

queue

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span (C++20)

 

std::span

Member functions

span::span

span::operator=

Element access

span::operator[]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

Non-member constant

dynamic_extent

Deduction guides

 

template< class T, std::ptrdiff_t N> std::span<const std::byte, S/* see below */> as_bytes(std::span<T, N> s) noexcept;	(1)
template< class T, std::ptrdiff_t N> std::span<std::byte, S/* see below */> as_writable_bytes(std::span<T, N> s) noexcept;	(2)

Obtains a view to the object representation of the elements of the span s.

If N is std::dynamic_extent, the extent of the returned span S is also std::dynamic_extent; otherwise it is std::ptrdiff_t(sizeof(T)) * N.

as_writable_bytes only participates in overload resolution if std::is_const_v<T> is false.

Return value

1) A span constructed with {reinterpret_cast<const std::byte*>(s.data()), s.size_bytes()}.

2) A span constructed with {reinterpret_cast<std::byte*>(s.data()), s.size_bytes()}.