41 lines
983 B
Rust
41 lines
983 B
Rust
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// 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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// xfail-test
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fn vec_peek<T>(v: &r/[T]) -> Option< (&r/T, &r/[T]) > {
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if v.len() == 0 {
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None
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} else {
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let head = &v[0];
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let tail = v.view(1, v.len());
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Some( (head, tail) )
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}
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}
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fn test_peek_empty_stack() {
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let v : &[int] = &[];
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assert (None == vec_peek(v));
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}
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fn test_peek_empty_unique() {
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let v : ~[int] = ~[];
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assert (None == vec_peek(v));
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}
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fn test_peek_empty_managed() {
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let v : @[int] = @[];
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assert (None == vec_peek(v));
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}
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fn main() {}
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