From d1ca0fcc6aa350039646db748e30f23b8d84d116 Mon Sep 17 00:00:00 2001
From: X512 <danger_mail@list.ru>
Date: Thu, 10 Dec 2020 02:59:47 +0900
Subject: [PATCH] AutoDeleter: add IsSet method

Change-Id: I70eb43a288ec9c02471aa21ce5618f0fa2399bd7
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3486
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
---
 headers/private/shared/AutoDeleter.h | 29 +++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/headers/private/shared/AutoDeleter.h b/headers/private/shared/AutoDeleter.h
index cbf81b1de1..2d24368f2b 100644
--- a/headers/private/shared/AutoDeleter.h
+++ b/headers/private/shared/AutoDeleter.h
@@ -18,6 +18,7 @@
 
 #include <stdlib.h>
 #include <unistd.h>
+#include <SupportDefs.h>
 
 
 namespace BPrivate {
@@ -63,6 +64,11 @@ public:
 		SetTo(NULL);
 	}
 
+	inline bool IsSet() const
+	{
+		return fObject != NULL;
+	}
+
 	inline C *Get() const
 	{
 		return fObject;
@@ -214,8 +220,17 @@ struct MethodDeleter
 
 // HandleDeleter
 
+struct StatusHandleChecker
+{
+	inline bool operator()(status_t handle)
+	{
+		return handle >= B_OK;
+	}
+};
+
 template<typename C, typename DestructorResult,
-	DestructorResult (*Destructor)(C), C nullValue = -1>
+	DestructorResult (*Destructor)(C), C nullValue = -1,
+	typename Checker = StatusHandleChecker>
 class HandleDeleter {
 public:
 	inline HandleDeleter()
@@ -230,13 +245,15 @@ public:
 
 	inline ~HandleDeleter()
 	{
-		Destructor(fHandle);
+		if (IsSet())
+			Destructor(fHandle);
 	}
 
 	inline void SetTo(C handle)
 	{
 		if (handle != fHandle) {
-			Destructor(fHandle);
+			if (IsSet())
+				Destructor(fHandle);
 			fHandle = handle;
 		}
 	}
@@ -251,6 +268,12 @@ public:
 		SetTo(nullValue);
 	}
 
+	inline bool IsSet() const
+	{
+		Checker isHandleSet;
+		return isHandleSet(fHandle);
+	}
+
 	inline C Get() const
 	{
 		return fHandle;