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|
//! This crate adds the missing Option::inspect function via an extension trait
//!
pub trait OptionInspect<F, T>
where F: FnOnce(&T),
T: Sized
{
fn inspect(self, f: F) -> Self;
}
pub trait OptionInspectRef<F, T>
where F: FnOnce(&T),
T: Sized
{
fn inspect(&self, f: F);
}
impl<F, T> OptionInspect<F, T> for Option<T>
where F: FnOnce(&T),
T: Sized
{
fn inspect(self, f: F) -> Self {
if let Some(ref o) = self.as_ref() {
(f)(&o);
}
self
}
}
impl<F, T> OptionInspectRef<F, T> for Option<T>
where F: FnOnce(&T),
T: Sized
{
fn inspect(&self, f: F) {
if let Some(ref o) = self {
(f)(&o);
}
}
}
pub trait OptionInspectNone<F>
where F: FnOnce(),
{
fn inspect_none(self, f: F) -> Self;
}
pub trait OptionInspectNoneRef<F>
where F: FnOnce(),
{
fn inspect_none(&self, f: F);
}
impl<F, T> OptionInspectNone<F> for Option<T>
where F: FnOnce()
{
fn inspect_none(self, f: F) -> Self {
if let None = self.as_ref() {
(f)();
}
self
}
}
impl<F, T> OptionInspectNoneRef<F> for Option<T>
where F: FnOnce()
{
fn inspect_none(&self, f: F) {
if let None = self {
(f)();
}
}
}
|
