feat: add From/TryFrom impls for references types involving newtypes (#634)

Author: molpopgen

src/sys/macros.rs

@@ -56,6 +56,12 @@ macro_rules! impl_id_traits {
             }
         }
 
+        impl From<&super::bindings::tsk_id_t> for $idtype {
+            fn from(value: &super::bindings::tsk_id_t) -> Self {
+                Self(*value)
+            }
+        }
+
         impl TryFrom<$idtype> for usize {
             type Error = $crate::TskitError;
             fn try_from(value: $idtype) -> Result<Self, Self::Error> {
@@ -69,12 +75,25 @@ macro_rules! impl_id_traits {
             }
         }
 
+        impl TryFrom<&$idtype> for usize {
+            type Error = $crate::TskitError;
+            fn try_from(value: &$idtype) -> Result<Self, Self::Error> {
+                (*value).try_into()
+            }
+        }
+
         impl From<$idtype> for super::bindings::tsk_id_t {
             fn from(value: $idtype) -> Self {
                 value.0
             }
         }
 
+        impl From<&$idtype> for super::bindings::tsk_id_t {
+            fn from(value: &$idtype) -> Self {
+                value.0
+            }
+        }
+
         impl TryFrom<$idtype> for SizeType {
             type Error = $crate::TskitError;
 
@@ -83,6 +102,14 @@ macro_rules! impl_id_traits {
             }
         }
 
+        impl TryFrom<&$idtype> for SizeType {
+            type Error = $crate::TskitError;
+
+            fn try_from(value: &$idtype) -> Result<Self, Self::Error> {
+                SizeType::try_from(*value)
+            }
+        }
+
         impl PartialEq<super::bindings::tsk_id_t> for $idtype {
             fn eq(&self, other: &super::bindings::tsk_id_t) -> bool {
                 self.0 == *other
@@ -182,12 +209,24 @@ macro_rules! impl_f64_newtypes {
             }
         }
 
+        impl From<&f64> for $type {
+            fn from(value: &f64) -> Self {
+                Self(*value)
+            }
+        }
+
         impl From<$type> for f64 {
             fn from(value: $type) -> Self {
                 value.0
             }
         }
 
+        impl From<&$type> for f64 {
+            fn from(value: &$type) -> Self {
+                value.0
+            }
+        }
+
         impl std::ops::Sub for $type {
             type Output = Self;
 

src/sys/newtypes.rs

@@ -229,3 +229,17 @@ fn test_usize_to_size_type() {
     let s = SizeType::try_from(x).ok();
     assert_eq!(s, Some(0.into()));
 }
+
+#[test]
+fn test_from_reference() {
+    let x = 2;
+    let y = NodeId::from(&x);
+    assert_eq!(y, 2);
+    assert_eq!(2, tsk_id_t::from(&y));
+}
+
+#[test]
+fn test_try_from_reference() {
+    let y = NodeId::from(2);
+    assert_eq!(2, usize::try_from(&y).unwrap());
+}