37 lines
1.1 KiB
Rust
37 lines
1.1 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 main() { test05(); }
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fn mk_counter<A:Copy>() -> fn~(A) -> (A,uint) {
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// The only reason that the counter is generic is so that it closes
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// over both a type descriptor and some data.
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let v = ~[mut 0u];
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return fn~(a: A) -> (A,uint) {
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let n = v[0];
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v[0] = n + 1u;
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(a, n)
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};
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}
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fn test05() {
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let fp0 = mk_counter::<float>();
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assert (5.3f, 0u) == fp0(5.3f);
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assert (5.5f, 1u) == fp0(5.5f);
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let fp1 = copy fp0;
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assert (5.3f, 2u) == fp0(5.3f);
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assert (5.3f, 2u) == fp1(5.3f);
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assert (5.5f, 3u) == fp0(5.5f);
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assert (5.5f, 3u) == fp1(5.5f);
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}
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