Add StrideError

Author: termoshtt

src/error.rs

@@ -44,17 +44,34 @@ impl error::Error for NotSquareError {
     }
 }
 
+#[derive(Debug)]
+pub struct StrideError {}
+
+impl fmt::Display for StrideError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "invalid stride")
+    }
+}
+
+impl error::Error for StrideError {
+    fn description(&self) -> &str {
+        "invalid stride"
+    }
+}
+
 #[derive(Debug)]
 pub enum LinalgError {
     NotSquare(NotSquareError),
     Lapack(LapackError),
+    Stride(StrideError),
 }
 
 impl fmt::Display for LinalgError {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {
             LinalgError::NotSquare(ref err) => err.fmt(f),
             LinalgError::Lapack(ref err) => err.fmt(f),
+            LinalgError::Stride(ref err) => err.fmt(f),
         }
     }
 }
@@ -64,6 +81,7 @@ impl error::Error for LinalgError {
         match *self {
             LinalgError::NotSquare(ref err) => err.description(),
             LinalgError::Lapack(ref err) => err.description(),
+            LinalgError::Stride(ref err) => err.description(),
         }
     }
 }
@@ -79,3 +97,9 @@ impl From<LapackError> for LinalgError {
         LinalgError::Lapack(err)
     }
 }
+
+impl From<StrideError> for LinalgError {
+    fn from(err: StrideError) -> LinalgError {
+        LinalgError::Stride(err)
+    }
+}