48 lines
1.1 KiB
Rust
48 lines
1.1 KiB
Rust
// This test had to do with an outdated version of the iterable trait.
|
|
// However, the condition it was testing seemed complex enough to
|
|
// warrant still having a test, so I inlined the old definitions.
|
|
|
|
trait iterable<A> {
|
|
fn iter(blk: fn(A));
|
|
}
|
|
|
|
impl<A> of iterable<A> for fn@(fn(A)) {
|
|
fn iter(blk: fn(A)) { self(blk); }
|
|
}
|
|
|
|
impl of iterable<uint> for fn@(fn(uint)) {
|
|
fn iter(blk: fn(&&uint)) { self( |i| blk(i) ) }
|
|
}
|
|
|
|
fn filter<A,IA:iterable<A>>(self: IA, prd: fn@(A) -> bool, blk: fn(A)) {
|
|
do self.iter |a| {
|
|
if prd(a) { blk(a) }
|
|
}
|
|
}
|
|
|
|
fn foldl<A,B,IA:iterable<A>>(self: IA, +b0: B, blk: fn(B, A) -> B) -> B {
|
|
let mut b <- b0;
|
|
do self.iter |a| {
|
|
b <- blk(b, a);
|
|
}
|
|
return b;
|
|
}
|
|
|
|
fn range(lo: uint, hi: uint, it: fn(uint)) {
|
|
let mut i = lo;
|
|
while i < hi {
|
|
it(i);
|
|
i += 1u;
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let range = |a| range(0u, 1000u, a);
|
|
let filt = |a| filter(
|
|
range,
|
|
|&&n: uint| n % 3u != 0u && n % 5u != 0u,
|
|
a);
|
|
let sum = foldl(filt, 0u, |accum, &&n: uint| accum + n );
|
|
|
|
io::println(fmt!{"%u", sum});
|
|
} |