1 files changed, 37 insertions, 0 deletions
diff --git a/headers/src/convert.rs b/headers/src/convert.rs
new file mode 100644
index 0000000..1153965
--- /dev/null
+++ b/headers/src/convert.rs
@@ -0,0 +1,37 @@
+//TODO potentially move HeaderTryFrom to `mail-headers`
+use error::ComponentCreationError;
+
+//TODO replace with std TryFrom once it is stable
+// (either a hard replace, or a soft replace which implements HeaderTryFrom if TryFrom exist)
+/// Workaround for `TryFrom`,`TryInto` not being stable.
+pub trait HeaderTryFrom<T>: Sized {
+    fn try_from(val: T) -> Result<Self, ComponentCreationError>;
+}
+
+/// Workaround for `TryFrom`,`TryInto` not being stable.
+pub trait HeaderTryInto<T>: Sized {
+    fn try_into(self) -> Result<T, ComponentCreationError>;
+}
+
+impl<F, T> HeaderTryInto<T> for F where T: HeaderTryFrom<F> {
+    fn try_into(self) -> Result<T, ComponentCreationError> {
+        T::try_from(self)
+    }
+}
+
+
+impl<T> HeaderTryFrom<T> for T {
+    fn try_from(val: T) -> Result<Self, ComponentCreationError> {
+        Ok( val )
+    }
+}
+
+// It is not possible to auto-implement HeaderTryFrom for From/Into as
+// this will make new HeaderTryFrom implementations outside of this care
+// nearly impossible making the trait partially useless
+//
+//impl<T, F> HeaderTryFrom<F> for T where F: Into<T> {
+//    fn try_from(val: F) -> Result<T, Error> {
+//        Ok( val.into() )
+//    }
+//}
+\ No newline at end of file