rust/src/test/run-pass/match-vec-alternatives.rs

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// Copyright 2014 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.
// pretty-expanded FIXME #23616
#![feature(advanced_slice_patterns)]
fn match_vecs<'a, T>(l1: &'a [T], l2: &'a [T]) -> &'static str {
match (l1, l2) {
([], []) => "both empty",
([], [..]) | ([..], []) => "one empty",
([..], [..]) => "both non-empty"
}
}
fn match_vecs_cons<'a, T>(l1: &'a [T], l2: &'a [T]) -> &'static str {
match (l1, l2) {
([], []) => "both empty",
([], [_, ..]) | ([_, ..], []) => "one empty",
([_, ..], [_, ..]) => "both non-empty"
}
}
fn match_vecs_snoc<'a, T>(l1: &'a [T], l2: &'a [T]) -> &'static str {
match (l1, l2) {
([], []) => "both empty",
([], [.., _]) | ([.., _], []) => "one empty",
([.., _], [.., _]) => "both non-empty"
}
}
fn match_nested_vecs_cons<'a, T>(l1: Option<&'a [T]>, l2: Result<&'a [T], ()>) -> &'static str {
match (l1, l2) {
(Some([]), Ok([])) => "Some(empty), Ok(empty)",
(Some([_, ..]), Ok(_)) | (Some([_, ..]), Err(())) => "Some(non-empty), any",
(None, Ok([])) | (None, Err(())) | (None, Ok([_])) => "None, Ok(less than one element)",
(None, Ok([_, _, ..])) => "None, Ok(at least two elements)",
_ => "other"
}
}
fn match_nested_vecs_snoc<'a, T>(l1: Option<&'a [T]>, l2: Result<&'a [T], ()>) -> &'static str {
match (l1, l2) {
(Some([]), Ok([])) => "Some(empty), Ok(empty)",
(Some([.., _]), Ok(_)) | (Some([.., _]), Err(())) => "Some(non-empty), any",
(None, Ok([])) | (None, Err(())) | (None, Ok([_])) => "None, Ok(less than one element)",
(None, Ok([.., _, _])) => "None, Ok(at least two elements)",
_ => "other"
}
}
fn main() {
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assert_eq!(match_vecs(&[1, 2], &[2, 3]), "both non-empty");
assert_eq!(match_vecs(&[], &[1, 2, 3, 4]), "one empty");
assert_eq!(match_vecs::<uint>(&[], &[]), "both empty");
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assert_eq!(match_vecs(&[1, 2, 3], &[]), "one empty");
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assert_eq!(match_vecs_cons(&[1, 2], &[2, 3]), "both non-empty");
assert_eq!(match_vecs_cons(&[], &[1, 2, 3, 4]), "one empty");
assert_eq!(match_vecs_cons::<uint>(&[], &[]), "both empty");
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assert_eq!(match_vecs_cons(&[1, 2, 3], &[]), "one empty");
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assert_eq!(match_vecs_snoc(&[1, 2], &[2, 3]), "both non-empty");
assert_eq!(match_vecs_snoc(&[], &[1, 2, 3, 4]), "one empty");
assert_eq!(match_vecs_snoc::<uint>(&[], &[]), "both empty");
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assert_eq!(match_vecs_snoc(&[1, 2, 3], &[]), "one empty");
assert_eq!(match_nested_vecs_cons(None, Ok::<&[_], ()>(&[4_usize, 2_usize])),
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"None, Ok(at least two elements)");
assert_eq!(match_nested_vecs_cons::<uint>(None, Err(())), "None, Ok(less than one element)");
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assert_eq!(match_nested_vecs_cons::<bool>(Some::<&[_]>(&[]), Ok::<&[_], ()>(&[])),
"Some(empty), Ok(empty)");
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assert_eq!(match_nested_vecs_cons(Some::<&[_]>(&[1]), Err(())), "Some(non-empty), any");
assert_eq!(match_nested_vecs_cons(Some::<&[_]>(&[(42, ())]), Ok::<&[_], ()>(&[(1, ())])),
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"Some(non-empty), any");
assert_eq!(match_nested_vecs_snoc(None, Ok::<&[_], ()>(&[4_usize, 2_usize])),
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"None, Ok(at least two elements)");
assert_eq!(match_nested_vecs_snoc::<uint>(None, Err(())), "None, Ok(less than one element)");
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assert_eq!(match_nested_vecs_snoc::<bool>(Some::<&[_]>(&[]), Ok::<&[_], ()>(&[])),
"Some(empty), Ok(empty)");
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assert_eq!(match_nested_vecs_snoc(Some::<&[_]>(&[1]), Err(())), "Some(non-empty), any");
assert_eq!(match_nested_vecs_snoc(Some::<&[_]>(&[(42, ())]), Ok::<&[_], ()>(&[(1, ())])),
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"Some(non-empty), any");
}