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

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

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

See also

(C++20)
 returns the number of elements in the sequence
(public member function)

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