bendns' repos / collar
stable array collectors
Diffstat (limited to 'src/maybe.rs')
-rw-r--r--src/maybe.rs25
1 files changed, 25 insertions, 0 deletions
diff --git a/src/maybe.rs b/src/maybe.rs
new file mode 100644
index 0000000..8e2bb23
--- /dev/null
+++ b/src/maybe.rs
@@ -0,0 +1,25 @@
+#[diagnostic::on_unimplemented(
+ message = "this is a helper for [Option, Result].",
+ label = "consider using collect_array_checked",
+ note = "you probably want to get a `None` if the iterator isnt big enough"
+)]
+#[doc(hidden)]
+pub trait Maybe {
+ type Unwrap;
+ type Or;
+ fn asr(self) -> Result<Self::Unwrap, Self::Or>;
+}
+impl<T> Maybe for Option<T> {
+ type Unwrap = T;
+ type Or = ();
+ fn asr(self) -> Result<Self::Unwrap, Self::Or> {
+ self.ok_or(())
+ }
+}
+impl<T, E> Maybe for Result<T, E> {
+ type Unwrap = T;
+ type Or = E;
+ fn asr(self) -> Result<Self::Unwrap, Self::Or> {
+ self
+ }
+}