VLERange: a range in between BidirectionalRange and RandomAccessRange

[Andrei Alexandrescu]

On 1/13/11 10:26 PM, Nick Sabalausky wrote:
[snip]
> [ 'f', {u with the umlaut}, 'n', 'f' ]
>
> Or:
>
> [ 'f', 'u', {umlaut combining character}, 'n', 'f' ]
>
> Those *both* get rendered exactly the same, and both represent the same
> four-letter sequence. In the second example, the 'u' and the {umlaut
> combining character} combine to form one grapheme. The f's and n's just
> happen to be single-code-point graphemes.
>
> Note that while some characters exist in pre-combined form (such as the {u
> with the umlaut} above), legend has it there are others than can only be
> represented using a combining character.
>
> It's also my understanding, though I'm not certain, that sometimes multiple
> combining characters can be used together on the same "root" character.

Thanks. One further question is: in the above example with 
u-with-umlaut, there is one code point that corresponds to the entire 
combination. Are there combinations that do not have a unique code point?

Andrei