libnoise 1.2.0

A simple, performant, and customizable procedural noise generation library.
Documentation 
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use crate::core::generator::{Generator, Generator1D, Generator2D, Generator3D, Generator4D};

/// A generator applying the supplied closure to results of the underlying generator.
///
/// For details, see the documentation of [`lambda()`]. Typically, this struct is not meant
/// to be used directly. Instead, [`lambda()`] implemented by [`Generator`], should be used
/// to create [`Lambda`].
///
/// [`lambda()`]: Generator::lambda
#[derive(Clone, Copy, Debug)]
pub struct Lambda<const D: usize, G, L> {
    generator: G,
    lambda: L,
}

impl<G: Generator<1>, L: Fn(f64) -> f64 + Copy> Generator1D for Lambda<1, G, L> {}
impl<G: Generator<2>, L: Fn(f64) -> f64 + Copy> Generator2D for Lambda<2, G, L> {}
impl<G: Generator<3>, L: Fn(f64) -> f64 + Copy> Generator3D for Lambda<3, G, L> {}
impl<G: Generator<4>, L: Fn(f64) -> f64 + Copy> Generator4D for Lambda<4, G, L> {}

impl<const D: usize, G, L> Lambda<D, G, L>
where
    G: Generator<D>,
    L: Fn(f64) -> f64,
{
    #[inline]
    pub fn new(generator: G, lambda: L) -> Self {
        Self { generator, lambda }
    }
}

impl<const D: usize, G, L> Generator<D> for Lambda<D, G, L>
where
    G: Generator<D>,
    L: Copy + Fn(f64) -> f64,
{
    #[inline]
    fn sample(&self, point: [f64; D]) -> f64 {
        (self.lambda)(self.generator.sample(point))
    }
}