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use super::Filter;
pub trait WrapSealed<F: Filter> {
type Wrapped: Filter;
fn wrap(&self, filter: F) -> Self::Wrapped;
}
impl<'a, T, F> WrapSealed<F> for &'a T
where
T: WrapSealed<F>,
F: Filter,
{
type Wrapped = T::Wrapped;
fn wrap(&self, filter: F) -> Self::Wrapped {
(*self).wrap(filter)
}
}
pub trait Wrap<F: Filter>: WrapSealed<F> {}
impl<T, F> Wrap<F> for T
where
T: WrapSealed<F>,
F: Filter,
{
}
/// Combines received filter with pre and after filters
///
/// # Example
///
/// ```
/// use crate::warp::Filter;
///
/// let route = warp::any()
/// .map(|| "hello world")
/// .with(warp::wrap_fn(|filter| filter));
/// ```
///
/// You can find the full example in the [usage example](https://github.com/seanmonstar/warp/blob/master/examples/wrapping.rs).
pub fn wrap_fn<F, T, U>(func: F) -> WrapFn<F>
where
F: Fn(T) -> U,
T: Filter,
U: Filter,
{
WrapFn { func }
}
#[derive(Debug)]
pub struct WrapFn<F> {
func: F,
}
impl<F, T, U> WrapSealed<T> for WrapFn<F>
where
F: Fn(T) -> U,
T: Filter,
U: Filter,
{
type Wrapped = U;
fn wrap(&self, filter: T) -> Self::Wrapped {
(self.func)(filter)
}
}