31 lines
911 B
Rust
31 lines
911 B
Rust
// Copyright 2014 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 trait OpInt<'a> { fn call<'a>(&'a mut self, int, int) -> int; }
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impl<'a> OpInt<'a> for |int, int|: 'a -> int {
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fn call(&mut self, a:int, b:int) -> int {
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(*self)(a, b)
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}
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}
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fn squarei<'a>(x: int, op: &'a mut OpInt) -> int { op.call(x, x) }
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fn muli(x:int, y:int) -> int { x * y }
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pub fn main() {
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let mut f = |x,y| muli(x,y);
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{
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let g = &mut f;
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let h = g as &mut OpInt;
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squarei(3, h);
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}
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}
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