std::span data() method

od C++20

constexpr pointer data() const noexcept;

Returns a pointer to the beginning of the sequence.

Parameters

(none)

Return value

A pointer to the beginning of sequence.

Complexity

Constant - O(1).

Exceptions

(none)

Notes

For a span s, the expression s.data() is equivalent to *s.begin() and s[0].

Example

Main.cpp

#include <span>
#include <iostream>
 
int main()
{
    constexpr char str[] = "ABCDEF\n";
 
    const std::span sp{str};
 
    for (auto n{sp.size()}; n != 2; --n) {
        std::cout << sp.last(n).data();
    }
}

Output

ABCDEF
BCDEF
CDEF
DEF
EF
F