Re: Issue 2149 in lilypond: Patch: Creates non-negative-integer? predicate.

[David Kastrup]

David Kastrup <address@hidden> writes:

> Ian Hulin <address@hidden> writes:
>
>> On 29/12/11 11:13, address@hidden wrote:
>>> 
>>> Comment #6 on issue 2149 by address@hidden: Patch: Creates 
>>> non-negative-integer? predicate. 
>>> http://code.google.com/p/lilypond/issues/detail?id=2149
>>> 
>>> I'll change it to whatever people think would be easiest - I really
>>> have no preference, but I do think it's important to have a
>>> user-friendly predicate if LilyPond is to use the box-integral
>>> method to create vertical skylines for other objects.
>> Why not call it /positive-integer?/ and state in the docstring it defines
>> any integer i where i >= 0 as positive.
>> Or if you want to stick to Guiles /positive?/, maybe use
>> /positive-integer-or-zero?/.
>>
>> Predicate names seem to work better if they describe what they're
>> testing for rather than what's being avoided.
>> <Bad pun alert>
>> It's better of they're positive . . .
>> </Bad pun alert>
>
> Really, I would just use "count?" here and save "a positive integer or
> zero" for the documentation string.

Or at least unsigned-integer? which is slightly less cumbersome.

-- 
David Kastrup