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stdlib: Add option::is_some

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This commit is contained in:
Brian Anderson 2011-06-16 10:52:43 -07:00
parent 49a4867da6
commit 0efd7fac8a
1 changed files with 4 additions and 0 deletions
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4
src/lib/option.rs
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@ -21,6 +21,10 @@ fn is_none[T](&t[T] opt) -> bool {
ret alt (opt) { case (none) { true } case (some(_)) { false } };
}
fn is_some[T](&t[T] opt) -> bool {
ret !is_none(opt);
}
fn from_maybe[T](&T def, &t[T] opt) -> T {
auto f = bind util::id[T](_);
ret maybe[T, T](def, f, opt);