using std::span to babysit array-new-allocated data

span_babysitter.c++

#include <cstddef>

#include <span>


template <typename T>
constexpr std::span<T> allocate(std::size_t size) {
    return {new T[size], size};
}

template <typename T>
constexpr void deällocate(std::span<T>& handle) {
    delete[] handle.data();
    handle = {};
}

#include <cassert>
#include <iostream>

int main() {
    auto memory = allocate<int>(55'000);
    assert(not memory.empty());
    deällocate(memory);
    assert(memory.empty());
}