safer casts - take II

[Joel C. Salomon]

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Yigal Chripun wrote:
> there are there forms of cast:
> (a) cast(T)something
> (b) cast!(T)something
> (c) reinterpret_cast!(T)

 So, for example, given the following definitions:
	class A {…}
	class B : A {…}
	class C : A {…}
	class D {…}
we can write:
	const A ac;
	auto a = cast!(A)a;
and:
	B b0;
	auto a = cast(A)b0;
	auto b = cast(B)a;	// should succeed
	auto c = cast(C)a;	// c is null
and:
	A a;
	auto d = reinterpret_cast(D)a;	// legal but unpredictable
Are these all the intended uses?

—Joel S.
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