c902eafa14
Most could use the each method, but because of the hack used to disambiguate old- and new-style loops, some had to use vec::each. (This hack will go away soon.) Issue #1619
43 lines
955 B
Rust
43 lines
955 B
Rust
import a::*;
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import b::baz;
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mod a {
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impl foo for uint { fn plus() -> int { self as int + 20 } }
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}
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mod b {
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impl baz for str { fn plus() -> int { 200 } }
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}
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impl util for uint {
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fn str() -> str { uint::str(self) }
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fn times(f: fn(uint)) {
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let mut c = 0u;
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while c < self { f(c); c += 1u; }
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}
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}
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impl util<T> for [T] {
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fn length_() -> uint { vec::len(self) }
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fn iter_(f: fn(T)) { for self.each {|x| f(x); } }
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fn map_<U>(f: fn(T) -> U) -> [U] {
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let mut r = [];
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for self.each {|elt| r += [f(elt)]; }
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r
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}
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}
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fn main() {
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impl foo for int { fn plus() -> int { self + 10 } }
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assert 10.plus() == 20;
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assert 10u.plus() == 30;
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assert "hi".plus() == 200;
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assert [1].length_().str() == "1";
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assert [3, 4].map_({|a| a + 4})[0] == 7;
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assert [3, 4].map_::<uint>({|a| a as uint + 4u})[0] == 7u;
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let mut x = 0u;
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10u.times {|_n| x += 2u;}
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assert x == 20u;
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}
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