bendns' repos / treaty
Diffstat (limited to 'src/build/builders/owned.rs')
-rw-r--r--src/build/builders/owned.rs56
1 files changed, 56 insertions, 0 deletions
diff --git a/src/build/builders/owned.rs b/src/build/builders/owned.rs
new file mode 100644
index 0000000..29098c8
--- /dev/null
+++ b/src/build/builders/owned.rs
@@ -0,0 +1,56 @@
+use crate::{build::protocols, implementer, protocol::ImplementerExt, walk, Builder};
+
+use super::IncompleteValue;
+
+pub struct OwnedBuilder<T> {
+ value: Option<T>,
+}
+
+impl<T> Default for OwnedBuilder<T> {
+ fn default() -> Self {
+ Self { value: None }
+ }
+}
+
+impl<'ctx, T: 'static> Builder<'ctx> for OwnedBuilder<T> {
+ type Error = IncompleteValue;
+
+ type Value = T;
+
+ fn as_visitor(&mut self) -> &mut dyn crate::protocol::Implementer<'ctx> {
+ self
+ }
+
+ fn build(self) -> Result<Self::Value, Self::Error> {
+ self.value.ok_or(IncompleteValue)
+ }
+}
+
+implementer! {
+ impl['ctx, T: 'static] OwnedBuilder<T> = [
+ protocols::owned::Owned<T>,
+ protocols::hint::RequestHint,
+ ];
+}
+
+impl<'ctx, T: 'static> protocols::hint::RequestHintObject<'ctx> for OwnedBuilder<T> {
+ fn request_hint(
+ &mut self,
+ hints: &mut dyn crate::protocol::Implementer<'ctx>,
+ ) -> Result<(), ()> {
+ if let Some(interface) =
+ hints.interface_for::<walk::protocols::hint::Hint<protocols::owned::Owned<T>>>()
+ {
+ interface.as_object().hint(self, ())
+ } else {
+ Ok(())
+ }
+ }
+}
+
+impl<'ctx, T: 'static> protocols::owned::Object<'ctx, T> for OwnedBuilder<T> {
+ fn visit(&mut self, value: T) -> Result<(), ()> {
+ self.value = Some(value);
+ Ok(())
+ }
+}