[swift-evolution] [Pitch] Add the DefaultConstructible protocol to the standard library

[Dave Abrahams]

on Mon Dec 26 2016, Adam Nemecek <adamnemecek-AT-gmail.com> wrote:

>> here weren't one, that hypothetical machine is, logically speaking,
> stripping the absolute-pitch-ness off of the MIDI note used for
> transposition and using it as a relative pitch offset.
>
> Indeed.
>
>> It's like the relationship between dates on the calendar and time
> intervals (10 days).
>
> No it's not. Two days cannot occur at the same time. Two events totally
> can. It's more like signals that combine.

Heh, you're missing my point because there's a “time” component to both
systems but that wasn't intended to be a connection.  It's like the
relationship between addresses in memory (pointers) and offsets.

If you want to treat your midi notes as bare numbers that can be added
and have no semantics of absolute pitch until you send them to a synth,
be my guest.  I would tend not to design a system that way, but if it
works for you, more power to ya.

I think I've offered all the help here that I have to give, and I don't
feel I'm successfully getting my point across, so with respect, I'm
going to retire from this discussion now.  I'm supposed to be on
vacation :-)

> On Mon, Dec 26, 2016 at 2:31 PM, Dave Abrahams <dabrahams at apple.com> wrote:
>
>>
>> on Mon Dec 26 2016, Adam Nemecek <adamnemecek-AT-gmail.com> wrote:
>>
>> >> `ManagedBuffer` is the standard library base class that offers
>> facilities
>> > for managing buffers. If there's a concrete use case that isn't served,
>> > then the argument would be to improve `ManagedBuffer` or to design other
>> > types or protocols for that use case, not to add a protocol to conform
>> > every type that implements `init()`.
>> >
>> > I'd prefer not to deal with raw storage unless necessary.
>> >
>> >> The distance between two values of type T does not itself need to be of
>> > type T,
>> >
>> > Never said otherwise.
>> >
>> >> Moreover, one can have distances being strideable opaque types that
>> can't
>> > even be initialized
>> >
>> > You sure can. Doesn't disprove any of my points.
>> >
>> >> This example does not make sense, computationally or musically.
>> >
>> > You mean that it does not make any sense to you. I have two midi streams
>> > (and they are midi) and I want to use one midi note to transpose the
>> other.
>> > I'm pretty sure that I can find a machine that does this in hardware if I
>> > really try. Does the fact that such machine might exist imbue the concept
>> > of midi addition with any meaning?
>>
>> There's a Channel Coarse Tuning SysEx message for this purpose.  Even if
>> there weren't one, that hypothetical machine is, logically speaking,
>> stripping the absolute-pitch-ness off of the MIDI note used for
>> transposition and using it as a relative pitch offset.  It's like the
>> relationship between dates on the calendar and time intervals (10 days).
>>
>> --
>> -Dave
>>

-- 
-Dave