---
title: "Objects Own Resources (RAII) | Microsoft Docs"
ms.custom: ""
ms.date: "11/04/2016"
ms.reviewer: ""
ms.suite: ""
ms.technology:  
  - "cpp-language"
ms.tgt_pltfrm: ""
ms.topic: "article"
dev_langs: 
  - "C++"
ms.assetid: f86b484e-5a27-4c3b-a92a-dfaa5dd6d93a
caps.latest.revision: 4
author: "mikeblome"
ms.author: "mblome"
manager: "ghogen"
translation.priority.ht: 
  - "cs-cz"
  - "de-de"
  - "es-es"
  - "fr-fr"
  - "it-it"
  - "ja-jp"
  - "ko-kr"
  - "pl-pl"
  - "pt-br"
  - "ru-ru"
  - "tr-tr"
  - "zh-cn"
  - "zh-tw"
---
# Objects Own Resources (RAII)
Make sure that objects own resources. This principle is also known as “resource acquisition is initialization” or “RAII.”  
  
## Example  
 Pass every “new” object as a constructor argument to another named object that owns it (almost always unique_ptr).  
  
```cpp  
void f() {  
    unique_ptr<widget> p( new widget() );  
    my_class x( new widget() );  
    // ...  
} // automatic destruction and deallocation for both widget objects  
  // automatic exception safety, as if "finally { p->dispose(); x.w.dispose(); }"  
```  
  
 Always immediately pass any new resource to another object that owns it.  
  
```cpp  
void g() {  
    other_class y( OpenFile() );  
    // ...  
} // automatic closing and release for file resource  
  // automatic exception safety, as if "finally { y.file.dispose(); }"  
```  
  
## See Also  
 [Welcome Back to C++](../cpp/welcome-back-to-cpp-modern-cpp.md)   
 [C++ Language Reference](../cpp/cpp-language-reference.md)   
 [C++ Standard Library](../standard-library/cpp-standard-library-reference.md)