openpgp: Add UserID::from_static_bytes, which is constant.

  - Add `UserID::from_static_bytes`, which is equivalent to
    `UserID::from` for a byte slice, but is a constant function.

1 files changed, 12 insertions, 0 deletions

diff --git a/openpgp/src/packet/mod.rs b/openpgp/src/packet/mod.rs
index 3a773a3a..68058053 100644
--- a/openpgp/src/packet/mod.rs
+++ b/openpgp/src/packet/mod.rs
@@ -610,6 +610,18 @@ pub struct Common {
 }
 assert_send_and_sync!(Common);
 
+impl Common {
+    /// Returns a default version of `Common`.
+    ///
+    /// This is equivalent to using `Common::from`, but the function
+    /// is constant.
+    pub(crate) const fn new() -> Self {
+        Common {
+            dummy: std::marker::PhantomData
+        }
+    }
+}
+
 #[cfg(test)]
 impl Arbitrary for Common {
     fn arbitrary(_: &mut Gen) -> Self {