[LAD] RT-Safe UI/Engine Decoupling using Functional Programming and Reference Counted SmartPointers
Florian Paul Schmidt
mista.tapas at gmx.net
Sat Aug 6 09:57:12 UTC 2011
On 08/06/2011 04:23 AM, Florian Paul Schmidt wrote:
> during the process of writing a new small jack sampler which fits my
> workflow I came up with this little scheme to solve the UI/engine
> decoupling problem. For the purpose of spreading the idea or
> alternatively getting answers about how it's broken and sucks I
> decided to write a little article describing it..
> The (largely unfinished and unusable) sampler project is here:
> Let me have it..
I guess I should mention the approach in a nutshell. Assiging a new
generator (that plays a sample) to the first element of a std::vector of
generators in the engine the UI would do e.g.:
where assign() is a function that builds a functor that dassigns the
right argument to the left, p is a
or with typedef
gens is a
boost::shared_ptr<disposable<std::vector<boost::shared_ptr<generator> > > >
or with typedefs:
or even shorter
Replacing the whole vector of generators with a new one (after e.g.
loading a complete setup) wood look like:
where v would be a disposable_generator_vector_ptr.
Just calling the set_sample member of a generator would look like this:
engine.commands.write(&generator::set_sample, engine.gens->t->t, s)
where s is a disposable_sample_ptr..
The ->t thingies show up, because every object is wrapped in a
disposable<T> which has a member t that is the "payload"..
I wonder if there's an even more elegant approach to cook down the
verbosity a bit.. What you get, though, for the verbosity is the ability
to call almost every member of every object in the engine's collection
of objects without writing extra classes to define a command.. Such is
the power of boost::bind and boost::function..
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