coremidi 0.4.0

CoreMIDI library for Rust
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use coremidi_sys::{
    MIDIGetNumberOfDestinations, MIDIGetDestination, MIDIEndpointDispose, ItemCount
};

use std::ops::Deref;

use Object;
use Endpoint;
use Destination;
use VirtualDestination;

impl Destination {
    /// Create a destination endpoint from its index.
    /// See [MIDIGetDestination](https://developer.apple.com/reference/coremidi/1495108-midigetdestination)
    ///
    pub fn from_index(index: usize) -> Option<Destination> {
        let endpoint_ref = unsafe { MIDIGetDestination(index as ItemCount) };
        match endpoint_ref {
            0 => None,
            _ => Some(Destination { endpoint: Endpoint { object: Object(endpoint_ref) } })
        }
    }
}

impl Deref for Destination {
    type Target = Endpoint;

    fn deref(&self) -> &Endpoint {
        &self.endpoint
    }
}

/// Destination endpoints available in the system.
///
/// The number of destinations available in the system can be retrieved with:
///
/// ```
/// let number_of_destinations = coremidi::Destinations::count();
/// ```
///
/// The destinations in the system can be iterated as:
///
/// ```rust,no_run
/// for destination in coremidi::Destinations {
///   println!("{}", destination.display_name().unwrap());
/// }
/// ```
///
pub struct Destinations;

impl Destinations {
    /// Get the number of destinations available in the system for sending MIDI messages.
    /// See [MIDIGetNumberOfDestinations](https://developer.apple.com/reference/coremidi/1495309-midigetnumberofdestinations).
    ///
    pub fn count() -> usize {
        unsafe { MIDIGetNumberOfDestinations() as usize }
    }
}

impl IntoIterator for Destinations {
    type Item = Destination;
    type IntoIter = DestinationsIterator;

    fn into_iter(self) -> Self::IntoIter {
        DestinationsIterator { index: 0, count: Self::count() }
    }
}

pub struct DestinationsIterator {
    index: usize,
    count: usize
}

impl Iterator for DestinationsIterator {
    type Item = Destination;

    fn next(&mut self) -> Option<Destination> {
        if self.index < self.count {
            let destination = Destination::from_index(self.index);
            self.index += 1;
            destination
        }
        else {
            None
        }
    }
}

impl VirtualDestination {

}

impl Deref for VirtualDestination {
    type Target = Endpoint;

    fn deref(&self) -> &Endpoint {
        &self.endpoint
    }
}

impl Drop for VirtualDestination {
    fn drop(&mut self) {
        unsafe { MIDIEndpointDispose(self.endpoint.object.0) };
    }
}