Impl EncodeLabelValue for Option<T>

prometheus · Apr 21, 2023 · 6e93d2a · 6e93d2a
1 parent 85033bf
commit 6e93d2a
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/src/encoding.rs b/src/encoding.rs
@@ -404,6 +404,18 @@ impl EncodeLabelValue for f64 {
  }
 }
 
+impl<T> EncodeLabelValue for Option<T>
+where
+ T: EncodeLabelValue,
+{
+ fn encode(&self, encoder: &mut LabelValueEncoder) -> Result<(), std::fmt::Error> {
+ match self {
+ Some(v) => EncodeLabelValue::encode(v, encoder),
+ None => EncodeLabelValue::encode(&"", encoder),
+ }
+ }
+}
+
 macro_rules! impl_encode_label_value_for_integer {
  ($($t:ident),*) => {$(
  impl EncodeLabelValue for $t {