Add nullptr support to sized delete operators.

src/jemalloc_cpp.cpp

@@ -118,11 +118,17 @@ void operator delete[](void *ptr, const std::nothrow_t &) noexcept
 void
 operator delete(void *ptr, std::size_t size) noexcept
 {
+	if (unlikely(ptr == nullptr)) {
+		return;
+	}
 	je_sdallocx(ptr, size, /*flags=*/0);
 }
 
 void operator delete[](void *ptr, std::size_t size) noexcept
 {
+	if (unlikely(ptr == nullptr)) {
+		return;
+	}
 	je_sdallocx(ptr, size, /*flags=*/0);
 }
 

test/integration/cpp/basic.cpp

@@ -6,6 +6,16 @@ TEST_BEGIN(test_basic)
 	auto foo = new long(4);
 	assert_ptr_not_null(foo, "Unexpected new[] failure");
 	delete foo;
+	// Test nullptr handling.
+	foo = nullptr;
+	delete foo;
+
+	auto bar = new long;
+	assert_ptr_not_null(bar, "Unexpected new failure");
+	delete bar;
+	// Test nullptr handling.
+	bar = nullptr;
+	delete bar;
 }
 TEST_END