orx-parallel 4.0.0

Performant parallel computations with an expressive iterator API.
Documentation 
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use crate::{Scope, parameters::non_zero_or_one};
use core::num::NonZeroUsize;
use rayon_core::ThreadPool;

impl<'s, 'env, 'scope> Scope<'s, 'env, 'scope> for &'s rayon_core::Scope<'scope> {
    fn run<W>(self, work: W)
    where
        'scope: 's,
        'env: 'scope + 's,
        W: FnOnce() + Send + 'scope + 'env,
    {
        self.spawn(move |_| work());
    }
}

impl crate::ThreadPool for ThreadPool {
    type ScopeRef<'s, 'env, 'scope>
        = &'s rayon_core::Scope<'scope>
    where
        'scope: 's,
        'env: 'scope + 's;

    fn scope<'env, 'scope, F>(&'env self, f: F)
    where
        'env: 'scope,
        for<'s> F: FnOnce(&'s rayon_core::Scope<'scope>) + Send,
    {
        rayon_core::ThreadPool::scope(self, f)
    }

    fn max_num_threads(&self) -> NonZeroUsize {
        non_zero_or_one(self.current_num_threads())
    }
}

impl crate::ThreadPool for &rayon_core::ThreadPool {
    type ScopeRef<'s, 'env, 'scope>
        = &'s rayon_core::Scope<'scope>
    where
        'scope: 's,
        'env: 'scope + 's;

    fn scope<'env, 'scope, F>(&'env self, f: F)
    where
        'env: 'scope,
        for<'s> F: FnOnce(&'s rayon_core::Scope<'scope>) + Send,
    {
        rayon_core::ThreadPool::scope(self, f)
    }

    fn max_num_threads(&self) -> NonZeroUsize {
        non_zero_or_one(self.current_num_threads())
    }
}

// 3. rayon
#[cfg(all(
    feature = "std",
    feature = "persistent-pool-rayon",
    not(all(feature = "wasm", target_arch = "wasm32")),
))]
pub fn build_default_rayon_thread_pool() -> rayon_core::ThreadPool {
    use crate::pools::env::max_num_threads_by_env_and_resource;

    let num_threads = max_num_threads_by_env_and_resource();
    rayon_core::ThreadPoolBuilder::new()
        .num_threads(num_threads.into())
        .build()
        .expect("failed to build rayon-core thread pool")
}