built-in string hash ?

[Kevin Bailey]

So I have a class containing two strings:

class Foo
{
	string s1, s2;

	...

and I'd like to add a toHash() member, but I can't find
the built-in string hash function. These don't work:

s1.toHash()
s1.toHash
s1.hash
s1.hash()
hash(s1)

yet strings can clearly be the key in a map.

I see that xml.d writes its own string hash function
but that just doesn't seem right.

Is there a way to get to the built-in ?