std::span<T,Extent>::size_bytes

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Execution support library (C++26)

Technical specifications

Symbols index

External libraries

 

Containers library

Sequence

array (C++11)

vector

vector<bool>

inplace_vector (C++26)

deque

forward_list (C++11)

list

Associative

set

multiset

map

multimap

Unordered associative

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

Adaptors

stack

queue

priority_queue

flat_set (C++23)

flat_multiset (C++23)

flat_map (C++23)

flat_multimap (C++23)

Views

span (C++20)

mdspan (C++23)

Tables

Iterator invalidation

Member function table

Non-member function table

 

std::span

Member functions

span::span

span::operator=

Element access

span::front

span::back

span::at (C++26)

span::operator[]

span::data

Iterators

span::beginspan::cbegin (C++23)

span::endspan::cend (C++23)

span::rbeginspan::crbegin (C++23)

span::rendspan::crend (C++23)

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

 

constexpr size_type size_bytes() const noexcept;		(since C++20)

Returns the size of the sequence in bytes.

Parameters

(none)

Return value

The size of the sequence in bytes, i.e., size() * sizeof(element_type).

Example

Run this code

#include <cstdint>
#include <span>
 
int main()
{
    constexpr static std::int32_t a[]{1, 2, 3, 4, 5};
    constexpr static std::span s{a};
 
    static_assert
    (
        sizeof(int32_t) == 4 &&
        std::size(a) == 5 &&
        sizeof a == 20 &&
        s.size() == 5 &&
        s.size_bytes() == 20
    );
}

See also

size (C++20)

returns the number of elements in the sequence (public member function)