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//! Thread-safe lifting of binary functions via references with [`send_ref_lift2`].
//!
//! Like [`RefLift::ref_lift2`](crate::classes::RefLift::ref_lift2), but the function
//! must be `Send` and element types must be `Send + Sync`.
//!
//! ### Examples
//!
//! ```
//! use fp_library::{
//! brands::*,
//! classes::*,
//! functions::*,
//! types::*,
//! };
//!
//! let x = ArcLazy::new(|| 3);
//! let y = ArcLazy::new(|| 4);
//! let z = send_ref_lift2::<LazyBrand<ArcLazyConfig>, _, _, _>(|a: &i32, b: &i32| *a + *b, &x, &y);
//! assert_eq!(*z.evaluate(), 7);
//! ```
#[fp_macros::document_module]
mod inner {
use {
crate::kinds::*,
fp_macros::*,
};
/// A type class for lifting a binary function into a context using references,
/// with `Send + Sync` bounds.
///
/// This is the thread-safe counterpart of [`RefLift`](crate::classes::RefLift).
#[kind(type Of<'a, A: 'a>: 'a;)]
pub trait SendRefLift {
/// Lifts a thread-safe binary function over two contexts using references.
#[document_signature]
///
#[document_type_parameters(
"The lifetime of the values.",
"The type of the first value.",
"The type of the second value.",
"The type of the result."
)]
///
#[document_parameters("The function to lift.", "The first context.", "The second context.")]
///
#[document_returns("A new context containing the result of applying the function.")]
#[document_examples]
///
/// ```
/// use fp_library::{
/// brands::*,
/// classes::*,
/// types::*,
/// };
///
/// let x = ArcLazy::new(|| 3);
/// let y = ArcLazy::new(|| 4);
/// let z = LazyBrand::<ArcLazyConfig>::send_ref_lift2(|a: &i32, b: &i32| *a + *b, &x, &y);
/// assert_eq!(*z.evaluate(), 7);
/// ```
fn send_ref_lift2<'a, A: Send + Sync + 'a, B: Send + Sync + 'a, C: Send + Sync + 'a>(
func: impl Fn(&A, &B) -> C + Send + 'a,
fa: &Apply!(<Self as Kind!( type Of<'a, T: 'a>: 'a; )>::Of<'a, A>),
fb: &Apply!(<Self as Kind!( type Of<'a, T: 'a>: 'a; )>::Of<'a, B>),
) -> Apply!(<Self as Kind!( type Of<'a, T: 'a>: 'a; )>::Of<'a, C>);
}
/// Lifts a thread-safe binary function over two contexts using references.
///
/// Free function version that dispatches to [the type class' associated function][`SendRefLift::send_ref_lift2`].
#[document_signature]
///
#[document_type_parameters(
"The lifetime of the values.",
"The brand of the context.",
"The type of the first value.",
"The type of the second value.",
"The type of the result."
)]
///
#[document_parameters("The function to lift.", "The first context.", "The second context.")]
///
#[document_returns("A new context containing the result of applying the function.")]
#[document_examples]
///
/// ```
/// use fp_library::{
/// brands::*,
/// functions::*,
/// types::*,
/// };
///
/// let x = ArcLazy::new(|| 3);
/// let y = ArcLazy::new(|| 4);
/// let z = send_ref_lift2::<LazyBrand<ArcLazyConfig>, _, _, _>(|a: &i32, b: &i32| *a + *b, &x, &y);
/// assert_eq!(*z.evaluate(), 7);
/// ```
pub fn send_ref_lift2<
'a,
Brand: SendRefLift,
A: Send + Sync + 'a,
B: Send + Sync + 'a,
C: Send + Sync + 'a,
>(
func: impl Fn(&A, &B) -> C + Send + 'a,
fa: &Apply!(<Brand as Kind!( type Of<'a, T: 'a>: 'a; )>::Of<'a, A>),
fb: &Apply!(<Brand as Kind!( type Of<'a, T: 'a>: 'a; )>::Of<'a, B>),
) -> Apply!(<Brand as Kind!( type Of<'a, T: 'a>: 'a; )>::Of<'a, C>) {
Brand::send_ref_lift2(func, fa, fb)
}
}
pub use inner::*;