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The All-in-One Guide to C++20

Create a std::span from a Pointer and a Size

Explore how to construct a std::span from a pointer and size to efficiently handle sequences in C++20. Understand the distinctions between std::span, std::string_view, and ranges library views, focusing on ownership and mutability.

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You can create a std::span from a pointer and a size.

C++
#include <algorithm>
#include <iostream>
#include <span>
#include <vector>
int main() {
    std::cout << '\n';
    std::cout << std::boolalpha;
    std::vector myVec{1, 2, 3, 4, 5};
    std::span mySpan1{myVec};
    std::span mySpan2{myVec.data(), myVec.size()};
    bool spansEqual = std::equal(mySpan1.begin(), mySpan1.end(),
                                 mySpan2.begin(), mySpan2.end());
    std::cout << "mySpan1 == mySpan2: " << spansEqual << '\n';
    std::cout << '\n';
}

As you may expect, mySpan1, created from the std::vector (line 12), and mySpan2, created from a pointer and a ...