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Implemented list::is_empty() based on Container trait

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Bruno de Oliveira Abinader 2014-02-25 01:06:54 -04:00
parent e589fcffcc
commit a14d72d49e
2 changed files with 12 additions and 17 deletions
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4
src/test/run-pass/non-boolean-pure-fns.rs
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@ -14,7 +14,7 @@
extern crate collections;
use collections::list::{List, Cons, Nil, head, is_empty};
use collections::list::{List, Cons, Nil, head};
fn pure_length_go<T:Clone>(ls: @List<T>, acc: uint) -> uint {
match *ls { Nil => { acc } Cons(_, tl) => { pure_length_go(tl, acc + 1u) } }
@ -25,7 +25,7 @@ fn pure_length<T:Clone>(ls: @List<T>) -> uint { pure_length_go(ls, 0u) }
fn nonempty_list<T:Clone>(ls: @List<T>) -> bool { pure_length(ls) > 0u }
fn safe_head<T:Clone>(ls: @List<T>) -> T {
assert!(!is_empty(ls));
assert!(!ls.is_empty());
return head(ls);
}