Merge pull request #892 from adetaylor/add-as-unique-ptr

Add UniquePtr::as_mut_ptr

src/unique_ptr.rs

@@ -90,6 +90,26 @@ where
         }
     }
 
+    /// Returns a pointer to the object owned by this UniquePtr
+    /// if any, otherwise the null pointer.
+    pub fn as_ptr(&self) -> *const T {
+        match self.as_ref() {
+            Some(target) => target as *const T,
+            None => std::ptr::null(),
+        }
+    }
+
+    /// Returns a mutable pointer to the object owned by this UniquePtr
+    /// if any, otherwise the null pointer.
+    ///
+    /// As with [std::unique_ptr\<T\>::get](https://en.cppreference.com/w/cpp/memory/unique_ptr/get),
+    /// this doesn't require that you hold a mutable reference to the `UniquePtr`.
+    /// This differs from Rust norms, so extra care should be taken in
+    /// the way the pointer is used.
+    pub fn as_mut_ptr(&self) -> *mut T {
+        self.as_ptr() as *mut T
+    }
+
     /// Consumes the UniquePtr, releasing its ownership of the heap-allocated T.
     ///
     /// Matches the behavior of [std::unique_ptr\<T\>::release](https://en.cppreference.com/w/cpp/memory/unique_ptr/release).

tests/test.rs

@@ -259,6 +259,8 @@ fn test_c_method_calls() {
     assert_eq!(2021, unique_ptr.get());
     assert_eq!(2021, unique_ptr.get2());
     assert_eq!(2021, *unique_ptr.getRef());
+    assert_eq!(2021, unsafe { unique_ptr.as_mut_ptr().as_ref() }.unwrap().get());
+    assert_eq!(2021, unsafe { unique_ptr.as_ptr().as_ref() }.unwrap().get());
     assert_eq!(2021, *unique_ptr.pin_mut().getMut());
     assert_eq!(2022, unique_ptr.pin_mut().set_succeed(2022).unwrap());
     assert!(unique_ptr.pin_mut().get_fail().is_err());