1 files changed, 41 insertions, 0 deletions
diff --git a/src/codegen/error.rs b/src/codegen/error.rs
new file mode 100644
index 00000000..ccb76c5b
--- /dev/null
+++ b/src/codegen/error.rs
@@ -0,0 +1,41 @@
+use std::error;
+use std::fmt;
+
+/// Errors that can occur during code generation.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum Error {
+    /// Tried to generate an opaque blob for a type that did not have a layout.
+    NoLayoutForOpaqueBlob,
+
+    /// Tried to instantiate an opaque template definition, or a template
+    /// definition that is too difficult for us to understand (like a partial
+    /// template specialization).
+    InstantiationOfOpaqueType,
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", error::Error::description(self))
+    }
+}
+
+impl error::Error for Error {
+    fn cause(&self) -> Option<&error::Error> {
+        None
+    }
+
+    fn description(&self) -> &'static str {
+        match *self {
+            Error::NoLayoutForOpaqueBlob => {
+                "Tried to generate an opaque blob, but had no layout"
+            }
+            Error::InstantiationOfOpaqueType => {
+                "Instantiation of opaque template type or partial template \
+                 specialization"
+            }
+        }
+    }
+}
+
+/// A `Result` of `T` or an error of `bindgen::codegen::error::Error`.
+pub type Result<T> = ::std::result::Result<T, Error>;