Allow custom deletion policies on grpc_core::UniquePtr<>

src/core/lib/support/memory.h

@@ -61,8 +61,8 @@ class DefaultDelete {
   void operator()(T* p) { Delete(p); }
 };
 
-template <typename T>
+template <typename T, typename Deleter = DefaultDelete<T>>
-using UniquePtr = std::unique_ptr<T, DefaultDelete<T>>;
+using UniquePtr = std::unique_ptr<T, Deleter>;
 
 template <typename T, typename... Args>
 inline UniquePtr<T> MakeUnique(Args&&... args) {

test/core/support/memory_test.cc

@@ -66,6 +66,19 @@ TEST(MemoryTest, MakeUniqueWithArgTest) {
   EXPECT_EQ(42, *i);
 }
 
+TEST(MemoryTest, UniquePtrWithCustomDeleter) {
+  int n = 0;
+  class IncrementingDeleter {
+   public:
+    void operator()(int* p) { ++*p; }
+  };
+  {
+    UniquePtr<int, IncrementingDeleter> p(&n);
+    EXPECT_EQ(0, n);
+  }
+  EXPECT_EQ(1, n);
+}
+
 }  // namespace testing
 }  // namespace grpc_core