Range-based for loop on a dynamic array?

Question

There is a range-based for loop with the syntax:

for(auto& i : array)

It works with constant arrays but not with pointer based dynamic

Answer 1

C++20 will (presumably) add std::span, which allows looping like this:

#include 
#include 

int main () {
    auto p = new int[5];
    for (auto &v : std::span(p, 5)) {
        v = 1;
    }
    for (auto v : std::span(p, 5)) {
        std::cout << v << '\n';
    }
    delete[] p;
}

This is supported by current compilers, e.g. gcc 10.1 and clang 7.0.0 and later. (Live)

Of course, if you have the choice, it is preferable to use std::vector over C-style arrays from the get-go.