30 lines
880 B
Rust
30 lines
880 B
Rust
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// Copyright 2018 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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type Func = fn(usize, usize) -> usize;
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fn foo(a: usize, b: usize) -> usize { a + b }
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fn bar(a: usize, b: usize) -> usize { a * b }
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fn test(x: usize) -> Func {
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if x % 2 == 0 { foo }
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else { bar }
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}
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const FOO: Func = foo;
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const BAR: Func = bar;
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fn main() {
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match test(std::env::consts::ARCH.len()) {
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FOO => println!("foo"),
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BAR => println!("bar"),
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_ => unreachable!(),
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}
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}
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