unique_pointers.cpp
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	#include <iostream>
	#include <memory>

	std::unique_ptr<double> get_scalar() {
	// create a unique pointer
	return std::make_unique<double>(3);
	}

	int main() {

	std::unique_ptr<double> ptr = get_scalar();
	// ... do what I need like...
	std::cout << *ptr;
	// no need to delete scalar (will be automatically)

	// cannot be copied => compilation error
	// std::unique_ptr<double> ptr_copy = ptr;
	}