2bf553c3e0
Implement `Vec::from_elem` by making the `vec![element; len]` macro more powerful (see RFC 832). Closes #22414
23 lines
796 B
Rust
23 lines
796 B
Rust
// Copyright 2015 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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pub fn main() {
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assert_eq!(vec![1; 3], vec![1, 1, 1]);
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assert_eq!(vec![1; 2], vec![1, 1]);
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assert_eq!(vec![1; 1], vec![1]);
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assert_eq!(vec![1; 0], vec![]);
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// from_elem syntax (see RFC 832)
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let el = Box::new(1);
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let n = 3;
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assert_eq!(vec![el; n], vec![Box::new(1), Box::new(1), Box::new(1)]);
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}
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