## Update

### Description

Update is called whenever an operator is expected to evaluate itself. This is the most important callback for a custom operator. The data is read, manipulated, and written back to the connected objects all within the scope of the Update callback.

Note | There are a number of tricks to aid in the optimization of your operator implementation in the Custom Operators section.

### Applies To

Custom Operators

### Syntax

    public class <operator_name>
    {
            public bool Update( Context in_context )
            {
                    ...
            }
    }

    CStatus <operator_name>_Update( CRef& in_context )
    {
            ...
    }

    function <operator_name>_Update( in_context )
    {
            ...
    }

    def <operator_name>_Update( in_context ):
            ...

    Function <filter_name>_Update( in_context )
            ...
    End Function

    sub <operator_name>_Update
    {
            my $in_context = shift;
    }

<operator_name> is the name specified in the call to PluginRegistrar.RegisterOperator, with any spaces converted to underscores.

### Parameters

Parameter | Language | Type | Description
--- | --- | --- | ---
in_context | Scripting and C# | OperatorContext | Context.Source returns the CustomOperator.
| C++ | CRef& | A reference to the OperatorContext object. Context::GetSource returns the CustomOperator.

### See Also

- Define
- DefineLayout
- Init (Operator)
- Operator Callbacks