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/// Types that yield values of a PCM signal.
pub trait Signal {
/// Read the next sample of given signal.
///
/// # Example
///
/// ```rust
/// # #[macro_use]
/// # extern crate approx;
/// # fn main() {
/// use sirena::signal::{self, Signal};
/// let frames = [0.1, 0.2];
/// let mut signal = signal::from_iter(frames);
/// assert_relative_eq!(signal.next(), 0.1);
/// assert_relative_eq!(signal.next(), 0.2);
/// # }
/// ```
fn next(&mut self) -> f32;
/// Borrows a Signal rather than consuming it.
///
/// This is useful to allow applying signal adaptors while still retaining ownership of the
/// original signal.
///
/// # Example
///
/// ```rust
/// # #[macro_use]
/// # extern crate approx;
/// # fn main() {
/// use sirena::signal::{self, Signal, SignalTake};
/// let frames = [0.1, 0.2, 0.3, 0.4, 0.5];
/// let mut signal = signal::from_iter(frames);
/// assert_relative_eq!(signal.next(), 0.1);
/// let mut sub_signal: Vec<_> = signal.by_ref().take(2).collect();
/// assert_relative_eq!(sub_signal[0], 0.2);
/// assert_relative_eq!(sub_signal[1], 0.3);
/// assert_relative_eq!(signal.next(), 0.4);
/// assert_relative_eq!(signal.next(), 0.5);
/// # }
/// ```
fn by_ref(&mut self) -> &mut Self
where
Self: Sized,
{
self
}
}
impl<'a, S> Signal for &'a mut S
where
S: Signal + ?Sized,
{
#[inline]
fn next(&mut self) -> f32 {
(**self).next()
}
}