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//! Pointer brands that can perform unsized coercion to thread-safe `dyn Fn` trait objects.
//!
//! ### Examples
//!
//! ```
//! use fp_library::{
//! brands::*,
//! functions::*,
//! };
//!
//! let f = to_dyn_send_fn::<ArcBrand, _, _>(|x: i32| x + 1);
//! assert_eq!(f(1), 2);
//! ```
#[fp_macros::document_module]
mod inner {
use {
crate::classes::*,
fp_macros::*,
};
/// Trait for pointer brands that can coerce to thread-safe `dyn Fn + Send + Sync`.
///
/// This is an independent trait (not a supertrait of `ToDynCloneFn`),
/// matching the pattern used by `SendCloneFn` (independent of `CloneFn`).
/// It extends `SendRefCountedPointer` because its methods return
/// `SendRefCountedPointer::Of` types.
pub trait ToDynSendFn: SendRefCountedPointer + 'static {
/// Coerces a sized Send+Sync closure to a `dyn Fn + Send + Sync`.
#[document_signature]
///
#[document_type_parameters(
"The lifetime of the closure.",
"The input type of the function.",
"The output type of the function."
)]
///
#[document_parameters("The closure to coerce.")]
///
#[document_returns(
"The closure wrapped in the pointer type as a thread-safe trait object."
)]
#[document_examples]
///
/// ```
/// use fp_library::{
/// brands::*,
/// functions::*,
/// };
///
/// let f = to_dyn_send_fn::<ArcBrand, _, _>(|x: i32| x + 1);
/// assert_eq!(f(1), 2);
/// ```
fn new<'a, A: 'a, B: 'a>(
f: impl 'a + Fn(A) -> B + Send + Sync
) -> Self::Of<'a, dyn 'a + Fn(A) -> B + Send + Sync>;
/// Coerces a sized Send+Sync by-reference closure to a `dyn Fn(&A) -> B + Send + Sync`.
#[document_signature]
///
#[document_type_parameters(
"The lifetime of the closure.",
"The input type (the closure receives `&A`).",
"The output type of the function."
)]
///
#[document_parameters("The closure to coerce.")]
///
#[document_returns(
"The closure wrapped in the pointer type as a thread-safe by-reference trait object."
)]
#[document_examples]
///
/// ```
/// use fp_library::{
/// brands::*,
/// classes::*,
/// };
///
/// let f = <ArcBrand as ToDynSendFn>::ref_new(|x: &i32| *x + 1);
/// assert_eq!(f(&1), 2);
/// ```
fn ref_new<'a, A: 'a, B: 'a>(
f: impl 'a + Fn(&A) -> B + Send + Sync
) -> Self::Of<'a, dyn 'a + Fn(&A) -> B + Send + Sync>;
}
/// Coerces a sized Send+Sync by-reference closure to a `dyn Fn(&A) -> B + Send + Sync`.
///
/// Free function version that dispatches to [`ToDynSendFn::ref_new`].
#[document_signature]
///
#[document_type_parameters(
"The lifetime of the closure.",
"The brand of the pointer.",
"The input type (the closure receives `&A`).",
"The output type of the function."
)]
///
#[document_parameters("The closure to coerce.")]
///
#[document_returns(
"The closure wrapped in the pointer type as a thread-safe by-reference trait object."
)]
#[document_examples]
///
/// ```
/// use fp_library::{
/// brands::*,
/// functions::*,
/// };
///
/// let f = to_ref_dyn_send_fn::<ArcBrand, _, _>(|x: &i32| *x + 1);
/// assert_eq!(f(&1), 2);
/// ```
pub fn ref_new<'a, Brand: ToDynSendFn, A: 'a, B: 'a>(
func: impl 'a + Fn(&A) -> B + Send + Sync
) -> Brand::Of<'a, dyn 'a + Fn(&A) -> B + Send + Sync> {
<Brand as ToDynSendFn>::ref_new::<A, B>(func)
}
/// Coerces a sized Send+Sync closure to a `dyn Fn + Send + Sync`.
///
/// Free function version that dispatches to [the type class' associated function][`ToDynSendFn::new`].
#[document_signature]
///
#[document_type_parameters(
"The lifetime of the closure.",
"The brand of the pointer.",
"The input type of the function.",
"The output type of the function."
)]
///
#[document_parameters("The closure to coerce.")]
///
#[document_returns("The closure wrapped in the pointer type as a thread-safe trait object.")]
#[document_examples]
///
/// ```
/// use fp_library::{
/// brands::*,
/// classes::to_dyn_send_fn::*,
/// functions::*,
/// };
///
/// let f = to_dyn_send_fn::<ArcBrand, _, _>(|x: i32| x + 1);
/// assert_eq!(f(1), 2);
/// ```
pub fn new<'a, Brand: ToDynSendFn, A: 'a, B: 'a>(
func: impl 'a + Fn(A) -> B + Send + Sync
) -> Brand::Of<'a, dyn 'a + Fn(A) -> B + Send + Sync> {
<Brand as ToDynSendFn>::new::<A, B>(func)
}
}
pub use inner::*;