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/* | |
struct Foo { | |
data: Vec<u8> | |
} | |
impl Foo { | |
fn p(&mut self, c: usize) { | |
self.data.insert(0, (c + 42) as u8); | |
} | |
fn n<F>(&self, f: F) -> usize where | |
F: Fn(&[u8]) -> &[u8] { | |
f(self.data.as_ref()).len() | |
} | |
fn a<F>(&self, f: F) -> &[u8] where | |
F: Fn(&[u8]) -> &[u8] | |
{ | |
f(self.data.as_ref()) | |
} | |
fn fa<F>(&mut self, f: &F) -> &[u8] where | |
F: Fn(&[u8]) -> &[u8] | |
{ | |
let s = self.n(f); | |
self.p(s); | |
self.a(f) | |
} | |
} | |
*/ | |
/* | |
struct Foo<O> { | |
data: Vec<O> | |
} | |
impl<O,> Foo<O> { | |
fn d(&self) -> &[O] { | |
self.data.as_ref() | |
} | |
fn p(&mut self, c: usize) { | |
self.data.truncate(c); | |
} | |
fn n<'b, F, CO>(&'b self, f: F) -> usize where | |
F: Fn(&'b [O]) -> (&'b [O], CO) { | |
f(self.d()).0.len() | |
} | |
fn a<'b, F, CO>(&'b self, f: F) -> CO where | |
F: Fn(&'b [O]) -> (&'b [O], CO) { | |
f(self.d()).1 | |
} | |
fn fa<'b, F, CO>(&'b mut self, f: &F) -> CO where | |
F: Fn(&'b [O]) -> (&'b [O], CO) { | |
let s = self.n(f); | |
self.p(s); | |
self.a(f) | |
} | |
} | |
*/ | |
struct Foo<O> { | |
data: Vec<O> | |
} | |
impl<O,> Foo<O> { | |
fn d(&self) -> &[O] { | |
self.data.as_ref() | |
} | |
fn p(&mut self, c: usize) { | |
self.data.truncate(c); | |
} | |
fn n<'b, F, CO>(&'b self, f: F) -> usize where | |
F: Fn(&[O]) -> (&[O], CO) { | |
f(self.d()).0.len() | |
} | |
fn a<'b, F, CO>(&'b self, f: F) -> CO where | |
F: Fn(&[O]) -> (&[O], CO) { | |
f(self.d()).1 | |
} | |
fn fa<'b, F, CO>(&'b mut self, f: &F) -> CO where | |
F: Fn(&[O]) -> (&[O], CO) { | |
let s = self.n(f); | |
self.p(s); | |
self.a(f) | |
} | |
} | |
fn x<F>(d: &[u8], f: F) -> &[u8] where | |
F: Fn(&[u8]) -> (&[u8], &[u8]) { | |
f(d).1 | |
} | |
fn main() { | |
fn z(i: &[u8]) -> (&[u8], &[u8]) { | |
(&i[0..5], &i[2..4]) | |
} | |
fn y(i: &[u8]) -> (&[u8], u32) { | |
(&i[0..5], 42) | |
} | |
let mut f = Foo { data: vec![0, 1, 2, 3, 4] }; | |
//println!("x: {:?}", x(&[1, 2, 3, 4, 5], z)); | |
//println!("x: {:?}", x(&[3, 4, 5, 6, 7], z)); | |
println!("bar: {:?}", f.fa(&z)); | |
println!("bar: {:?}", f.fa(&y)); | |
} |
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