2012-04-11 23:45:18 -05:00
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// This test had to do with an outdated version of the iterable iface.
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// However, the condition it was testing seemed complex enough to
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// warrant still having a test, so I inlined the old definitions.
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iface iterable<A> {
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fn iter(blk: fn(A));
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}
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impl<A> of iterable<A> for fn@(fn(A)) {
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fn iter(blk: fn(A)) { self(blk); }
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}
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impl of iterable<uint> for fn@(fn(uint)) {
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2012-06-30 18:19:07 -05:00
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fn iter(blk: fn(&&uint)) { self( |i| blk(i) ) }
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2012-04-11 23:45:18 -05:00
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}
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fn filter<A,IA:iterable<A>>(self: IA, prd: fn@(A) -> bool, blk: fn(A)) {
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2012-06-30 18:19:07 -05:00
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do self.iter |a| {
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2012-04-11 23:45:18 -05:00
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if prd(a) { blk(a) }
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}
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}
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fn foldl<A,B,IA:iterable<A>>(self: IA, +b0: B, blk: fn(B, A) -> B) -> B {
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let mut b <- b0;
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2012-06-30 18:19:07 -05:00
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do self.iter |a| {
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2012-04-11 23:45:18 -05:00
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b <- blk(b, a);
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}
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ret b;
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}
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2012-04-23 02:25:14 -05:00
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2012-05-26 02:32:08 -05:00
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fn range(lo: uint, hi: uint, it: fn(uint)) {
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let mut i = lo;
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while i < hi {
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it(i);
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i += 1u;
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}
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}
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2012-04-23 02:25:14 -05:00
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fn main() {
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2012-06-30 18:19:07 -05:00
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let range = |a| range(0u, 1000u, a);
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let filt = |a| filter(
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2012-04-11 23:45:18 -05:00
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range,
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2012-06-30 18:19:07 -05:00
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|&&n: uint| n % 3u != 0u && n % 5u != 0u,
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a);
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let sum = foldl(filt, 0u, |accum, &&n: uint| accum + n );
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2012-04-23 02:25:14 -05:00
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io::println(#fmt("%u", sum));
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}
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