On 12/11/08 8:24 PM, "Patrick McCarty" <pnor...@gmail.com> wrote:
> Hi Carl,
>
> On Thu, Dec 11, 2008 at 08:04:32PM -0700, Carl D. Sorensen wrote:
>> I'm trying to allow predefine fret diagrams to use the verbose style as well
>> as the terse style.
>>
>> I'd like to pass a diagram-definition to a music function that can be either
>> a list or a string. If it's a list, I'll treat the definition as a verbose
>> definition. If it's a string, I'll treat it as a terse definition. I've
>> got everything in place except for the data type check.
>>
>> What kind of a type check can I use to see if a variable is a list (or pair)
>> or a string?
>>
>> I'm after something like:
>>
>> (define-music-function (parser location key-symbol tuning shape-definition)
>> (symbol? pair? ????)
>>
>> Where ??? would be the true for either a pair or a string.
>
> There are a few custom type predicates in scm/c++.scm, but this one is
> not there. You could define a new type predicate (pair-or-string?)
> modeled after these ones, I suppose.
Thanks, Patrick!
Carl
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