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title: "RuntimeClass Class | Microsoft Docs"
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---
# RuntimeClass Class
Represents an instantiated class that inherits the specified number of interfaces, and provides the specified Windows Runtime, classic COM, and weak reference support.  
  
 You typically derive your WRL types from `RuntimeClass` because this class implements `AddRef`, `Release`, and `QueryInterface`, and helps manage the overall reference count of the module.  
  
## Syntax  
  
```  
template <  
   typename I0,  
   typename I1 = Details::Nil,  
   typename I2 = Details::Nil,  
   typename I3 = Details::Nil,  
   typename I4 = Details::Nil,  
   typename I5 = Details::Nil,  
   typename I6 = Details::Nil,  
   typename I7 = Details::Nil,  
   typename I8 = Details::Nil,  
   typename I9 = Details::Nil  
>  
class RuntimeClass : public Details::RuntimeClass<typename Details::InterfaceListHelper<I0, I1, I2, I3, I4, I5, I6, I7, I8, I9>::TypeT, RuntimeClassFlags<WinRt>>;  
  
template <  
   unsigned int classFlags,  
   typename I0,  
   typename I1,  
   typename I2,  
   typename I3,  
   typename I4,  
   typename I5,  
   typename I6,  
   typename I7,  
   typename I8  
>  
class RuntimeClass<RuntimeClassFlags<classFlags>, I0, I1, I2, I3, I4, I5, I6, I7, I8> : public Details::RuntimeClass<typename Details::InterfaceListHelper<I0, I1, I2, I3, I4, I5, I6, I7, I8>::TypeT, RuntimeClassFlags<classFlags> >;  
```  
  
#### Parameters  
 `I0`  
 The zeroth interface ID. (Mandatory)  
  
 `I1`  
 The first interface ID. (Optional)  
  
 `I2`  
 The second interface ID. (Optional)  
  
 `I3`  
 The third interface ID. (Optional)  
  
 `I4`  
 The fourth interface ID. (Optional)  
  
 `I5`  
 The fifth interface ID. (Optional)  
  
 `I6`  
 The sixth interface ID. (Optional)  
  
 `I7`  
 The seventh interface ID. (Optional)  
  
 `I8`  
 The eigth interface ID. (Optional)  
  
 `I9`  
 The ninth interface ID. (Optional)  
  
 `classFlags`  
 A combination of one or more [RuntimeClassType](../windows/runtimeclasstype-enumeration.md) enumeration values.  The   `__WRL_CONFIGURATION_LEGACY__` macro can be defined to change the default value of classFlags for all runtime classes in the project. If defined, RuntimeClass instances are non-agile dy default. When not defined, RuntimeClass instances are agile by default. To avoid ambiguity always specify the RuntimeClassType::FtmBase or RuntimeClassType::InhibitFtmBase.
  
## Members  
  
### Public Constructors  
  
|Name|Description|  
|----------|-----------------|  
|[RuntimeClass::RuntimeClass Constructor](../windows/runtimeclass-runtimeclass-constructor.md)|Initializes the current instance of the RuntimeClass class.|  
|[RuntimeClass::~RuntimeClass Destructor](../windows/runtimeclass-tilde-runtimeclass-destructor.md)|Deinitializes the current instance of the RuntimeClass class.|  
  
## Inheritance Hierarchy  
 `I0`  
  
 `ChainInterfaces`  
  
 `I0`  
  
 `RuntimeClassBase`  
  
 `ImplementsHelper`  
  
 `DontUseNewUseMake`  
  
 `RuntimeClassFlags`  
  
 `RuntimeClassBaseT`  
  
 `RuntimeClass`  
  
 `RuntimeClass`  
  
## Requirements  
 **Header:** implements.h  
  
 **Namespace:** Microsoft::WRL  
  
## See Also  
 [Microsoft::WRL Namespace](../windows/microsoft-wrl-namespace.md)