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