32 lines
962 B
Rust
32 lines
962 B
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
pure fn range(from: uint, to: uint, f: fn(uint) -> bool) {
|
|
let mut i = from;
|
|
while i < to {
|
|
if !f(i) {return;} // Note: legal to call argument, even if it is not pure.
|
|
i += 1u;
|
|
}
|
|
}
|
|
|
|
pure fn range2(from: uint, to: uint, f: fn(uint)) {
|
|
for range(from, to) |i| {
|
|
f(i*2u);
|
|
}
|
|
}
|
|
|
|
pure fn range3(from: uint, to: uint, f: {x: fn(uint)}) {
|
|
for range(from, to) |i| {
|
|
(f.x)(i*2u); //~ ERROR access to impure function prohibited
|
|
}
|
|
}
|
|
|
|
fn main() {}
|