bdc182cc41
fail!() used to require owned strings but can handle static strings now. Also, it can pass its arguments to fmt!() on its own, no need for the caller to call fmt!() itself.
63 lines
1.9 KiB
Rust
63 lines
1.9 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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// Check usage and precedence of block arguments in expressions:
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pub fn main() {
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let v = ~[-1f, 0f, 1f, 2f, 3f];
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// Statement form does not require parentheses:
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for vec::each(v) |i| {
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info!("%?", *i);
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}
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// Usable at all:
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let mut any_negative = do vec::any(v) |e| { e.is_negative() };
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assert!(any_negative);
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// Higher precedence than assignments:
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any_negative = do vec::any(v) |e| { e.is_negative() };
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assert!(any_negative);
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// Higher precedence than unary operations:
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let abs_v = do vec::map(v) |e| { e.abs() };
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assert!(do vec::all(abs_v) |e| { e.is_positive() });
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assert!(!do vec::any(abs_v) |e| { e.is_negative() });
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// Usable in funny statement-like forms:
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if !do vec::any(v) |e| { e.is_positive() } {
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assert!(false);
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}
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match do vec::all(v) |e| { e.is_negative() } {
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true => { fail!("incorrect answer."); }
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false => { }
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}
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match 3 {
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_ if do vec::any(v) |e| { e.is_negative() } => {
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}
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_ => {
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fail!("wrong answer.");
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}
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}
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// Lower precedence than binary operations:
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let w = do vec::foldl(0f, v) |x, y| { x + *y } + 10f;
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let y = do vec::foldl(0f, v) |x, y| { x + *y } + 10f;
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let z = 10f + do vec::foldl(0f, v) |x, y| { x + *y };
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assert!(w == y);
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assert!(y == z);
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// In the tail of a block
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let w =
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if true { do vec::any(abs_v) |e| { e.is_positive() } }
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else { false };
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assert!(w);
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}
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