std::span size_bytes() method

since C++20

constexpr size_type size_bytes() const noexcept;

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

Parameters

(none)

Return value

The size of the sequence in bytes.

Complexity

Constant - O(1).

Example

Main.cpp

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

Output

No output expected