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‎docs/cppcx/platform-agile-class.md‎

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## Syntax
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```cpp
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template <typename T>
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class Agile;
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```
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The address of a handle to an object of type `T`.
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### Remarks
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This operation releases the current representation of a object of type `T`, if any; reinitializes the Agile object's data members; acquires the current threading context; and then returns the address of a handle-to-object variable that can represent a non-agile object. To cause an Agile class instance to represent an object, use the assignment operator ([Agile::operator=](../cppcx/agile-operator-assign-operator.md)) to assign the object to the Agile class instance.
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This operation releases the current representation of a object of type `T`, if any; reinitializes the Agile object's data members; acquires the current threading context; and then returns the address of a handle-to-object variable that can represent a non-agile object. To cause an Agile class instance to represent an object, use the assignment operator ([Agile::operator=](#operator-assign)) to assign the object to the Agile class instance.
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## <a name="getaddressofforinput"></a> Agile::GetAddressOfForInOut Method
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Returns the address of a handle to the object represented by the current Agile object.

‎docs/cppcx/platform-delegate-class.md‎

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title: "Platform::Delegate Class | Microsoft Docs"
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---
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title: "Platform::Delegate Class | Microsoft Docs"
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# Platform::Delegate Class
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---
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# Platform::Delegate Class
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Represents a function object.
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## Syntax
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The Delegate class has the Equals(), GetHashCode(), and ToString() methods derived from the [Platform::Object Class](../cppcx/platform-object-class.md).
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### Remarks
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Use the [delegate](../Topic/delegate%20%20\(C++%20Component%20Extensions\).md) keyword to create delegates; do not use Platform::Delegate explicitly. For more information, see [Delegates](../cppcx/delegates-c-cx.md). For an example of how to create and consume a delegate, see [Creating Windows Runtime Components in C++](/MicrosoftDocs/windows-uwp/blob/docs/windows-apps-src/winrt-components/creating-windows-runtime-components-in-cpp.md).
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Use the [delegate](../windows/delegate-cpp-component-extensions.md) keyword to create delegates; do not use Platform::Delegate explicitly. For more information, see [Delegates](../cppcx/delegates-c-cx.md). For an example of how to create and consume a delegate, see [Creating Windows Runtime Components in C++](/MicrosoftDocs/windows-uwp/blob/docs/windows-apps-src/winrt-components/creating-windows-runtime-components-in-cpp.md).
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### Requirements
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**Minimum supported client:** [!INCLUDE[win8](../cppcx/includes/win8-md.md)]

‎docs/cppcx/platform-metadata-attribute-attribute.md‎

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# Platform::Metadata::Attribute Attribute
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---
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# Platform::Metadata::Attribute Attribute
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Represents the base class for all attributes.
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## Syntax
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```cpp
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public ref class Attribute abstract : Object
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```
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## Inheritance
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[Platform::Object](../cppcx/object-object-constructor.md)
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[Platform::Object](../cppcx/platform-object-class.md)
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[Platform::Metadata::Attribute](../cppcx/platform-metadata-attribute-attribute.md)
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### Remarks
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### Requirements
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**Minimum supported client:** [!INCLUDE[win8](../cppcx/includes/win8-md.md)]
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‎docs/cppcx/platform-metadata-defaultmemberattribute-attribute.md‎

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# Platform::Metadata::DefaultMemberAttribute Attribute
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# Platform::Metadata::DefaultMemberAttribute Attribute
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Indicates the preferred function to invoke among several possible overloaded functions.
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[Platform::Object](../cppcx/platform-object-class.md)
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[Platform::Metadata::Attribute](../cppcx/platform-metadata-attribute-attribute.md)
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‎docs/cppcx/platform-metadata-flagsattribute-attribute.md‎

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# Platform::Metadata::FlagsAttribute Attribute
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# Platform::Metadata::FlagsAttribute Attribute
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Indicates that an enumeration can be treated as a bit field; that is, a set of flags.
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‎docs/cppcx/platform-weakreference-class.md‎

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The last overload in the list above enables you to assign a ref class to a WeakReference variable. In this case the ref class is downcast to [Platform::Object](../cppcx/platform-object-class.md)^. You restore the original type later by specifying it as the argument for the type parameter in the [WeakReference::Resolve\<T>](../cppcx/weakreference-resolve-method-platform-namespace.md) member function.
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The last overload in the list above enables you to assign a ref class to a WeakReference variable. In this case the ref class is downcast to [Platform::Object](../cppcx/platform-object-class.md)^. You restore the original type later by specifying it as the argument for the type parameter in the [WeakReference::Resolve\<T>](#resolve) member function.
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‎docs/cppcx/ref-classes-and-structs-c-cx.md‎

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# Ref classes and structs (C++/CX)
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# Ref classes and structs (C++/CX)
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Platform::Object is the universal base class for all ref classes. All ref classes are implicitly convertible to Platform::Object and can override [Object::ToString](../cppcx/platform-object-class.md#tostring). However, the [!INCLUDE[wrt](../cppcx/includes/wrt-md.md)] inheritance model not intended as a general inheritance model; in C++/CX this means that a user-defined public ref class cannot serve as a base class.
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‎docs/cppcx/type-system-c-cx.md‎

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- Can directly inherit from one base class and can implement any number of interfaces. All ref classes are implicitly convertible to the [Platform::Object Class](../cppcx/platform-object-class.md) and can override its virtual methods—for example, [Object::ToString](../cppcx/platform-object-class.md#tostring).
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‎docs/cppcx/weak-references-and-breaking-cycles-c-cx.md‎

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In any type system that's based on reference-counting, references to types can form *cycles*—that is, one object refers to a second object, the second object refers to a third object, and so on until some final object refers back to the first object. In a cycle, objects can't be deleted correctly when one object's reference count becomes zero. To help you solve this problem, C++/CX provides the [Platform::WeakReference Class](../cppcx/platform-weakreference-class.md) class. A `WeakReference` object supports the [Resolve](../cppcx/weakreference-resolve-method-platform-namespace.md) method, which returns null if the object no longer exists, or throws an [Platform::InvalidCastException](../cppcx/platform-invalidcastexception-class.md) if the object is alive but is not of type `T`.
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# Weak references and breaking cycles (C++/CX)
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In any type system that's based on reference-counting, references to types can form *cycles*—that is, one object refers to a second object, the second object refers to a third object, and so on until some final object refers back to the first object. In a cycle, objects can't be deleted correctly when one object's reference count becomes zero. To help you solve this problem, C++/CX provides the [Platform::WeakReference Class](../cppcx/platform-weakreference-class.md) class. A `WeakReference` object supports the [Resolve](../cppcx/platform-weakreference-class.md#resolve) method, which returns null if the object no longer exists, or throws an [Platform::InvalidCastException](../cppcx/platform-invalidcastexception-class.md) if the object is alive but is not of type `T`.
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One scenario in which `WeakReference` must be used is when the `this` pointer is captured in a lambda expression that's used to define an event handler. We recommend that you use named methods when you define event handlers, but if you want to use a lambda for your event handler—or if you have to break a reference counting cycle in some other situation—use `WeakReference`. Here's an example:
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‎docs/data/mfc-database-classes-odbc-and-dao.md‎

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- [Using Database Classes Without Documents and Views](../data/mfc-using-database-classes-without-documents-and-views.md)

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