C++ pointer alternatives

iuhgi.md

C	C++
T* owning a single object	T
T* borrowing a single object	T&
T* owning a single object, nullable	std::optional<T>
T* owning a single object, polymorphic	std::unique_ptr<T>
T* owning an array (dynamic size)	std::vector<T>
T[N] owning an array (static size)	std::array<T, N>
T* borrowing an array (dynamic size)	std::vector<T>& or std::span<T> (gsl::span<T> in C++17)
T* borrowing an array (static size)	std::array<T, N>& or std::span<T, N> (gsl::span<T, N> in C++17)
char* owning a string	std::string
char* borrowing a string	std::string& or std::string_view