# OperationUnion
<a name="API_OperationUnion"></a>

A union type representing the operation to perform on a construct during a mapping update.

## Contents
<a name="API_OperationUnion_Contents"></a>

**Important**  
This data type is a UNION, so only one of the following members can be specified when used or returned.

 ** update **   <a name="mgn-Type-OperationUnion-update"></a>
An update operation to modify construct properties.  
Type: [UpdateOperation](API_UpdateOperation.md) object  
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/mgn-2020-02-26/OperationUnion) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/mgn-2020-02-26/OperationUnion) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/mgn-2020-02-26/OperationUnion)