If you prefer to think about &str, ~str, and @str as separate types, an
analogy to C++ might be helpful:
&T is like T *.
~T is like std::auto_ptr<T> in C++03 or std::unique_ptr<T> in C++0x.
@T is like std::shared_ptr<T>.
&str is like char *.
~str is like std::string.
@str is like CString in Microsoft's ATL (reference counted).
&[T] is like a (T *, size_t length) pair.
~[T] is like std::vector<T>.
@[T] is like std::shared_ptr<std::vector<T>>, but without the extra
level of indirection.
Essentially, it's like C++ with several of the most common smart pointer
types made type-safe and built into the language.
Patrick
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