30 lines
1.3 KiB
Rust
30 lines
1.3 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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fn repeat(x: &uint) -> ~[uint] { ~[*x, *x] }
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fn incd_if_even(x: &uint) -> Option<uint> {
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if (*x % 2u) == 0u {Some(*x + 1u)} else {None}
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}
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pub fn main() {
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assert!((~[1u, 3u]).flat_map_to_vec(repeat) == ~[1u, 1u, 3u, 3u]);
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assert!((~[]).flat_map_to_vec(repeat) == ~[]);
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assert!(old_iter::flat_map_to_vec(&None::<uint>, repeat) == ~[]);
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assert!(old_iter::flat_map_to_vec(&Some(1u), repeat) == ~[1u, 1u]);
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assert!(old_iter::flat_map_to_vec(&Some(2u), repeat) == ~[2u, 2u]);
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assert!((~[1u, 2u, 5u]).flat_map_to_vec(incd_if_even) == ~[3u]);
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assert!((~[]).flat_map_to_vec(incd_if_even) == ~[]);
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assert!(old_iter::flat_map_to_vec(&None::<uint>, incd_if_even) == ~[]);
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assert!(old_iter::flat_map_to_vec(&Some(1u), incd_if_even) == ~[]);
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assert!(old_iter::flat_map_to_vec(&Some(2u), incd_if_even) == ~[3u]);
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}
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