MDGContext Class Reference

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#include <MDGContext.h>

Class Description

Dependency graph (DG) context class.

Control the way in which dependency nodes are evaluated.

DG contexts are used to define the way in which a dependency node is going to be evaluated. Examples of such contexts include "normal", "at a given time, "for a specific instance", etc.

MDGContext is mainly used in two places; within methods that trigger evaluations, to define what kind of evaluate is being requested, and within data blocks (MDataBlock), to identify how the data was created.

Examples:

Public Member Functions
	MDGContext ()
	Constructor. More...
	MDGContext (const MTime &when)
	Constructor. More...
	MDGContext (const MDGContext &in)
	Copy constructor. More...
	~MDGContext ()
	Destructor.
bool	isNormal (MStatus *ReturnStatus=NULL) const
	Determines if this context is that of "normal" evaluation. More...
MStatus	getTime (MTime &) const
	Return the single time for which this context is valid. More...
MDGContext &	operator= (const MDGContext &other)
	Assignment operator. More...

Static Public Member Functions
static const char *	className ()
	Returns the name of this class. More...

Friends
class	MPlug
class	MDataBlock

Constructor & Destructor Documentation

MDGContext

(

)

Constructor.

Creates a context to define the way in which a dependency node is evaluated. In this case the new context will be for a normal evaluation.

MDGContext

(

const MTime &

atTime

)

Constructor.

Creates a context to define the way in which a dependency node is evaluated. In this case the new context will be for an evaluation at a specific time.

Parameters

[in]

atTime

The time in which the evaluation will take place

MDGContext

(

const MDGContext &

other

)

Copy constructor.

Duplicates the given DG context.

Parameters

[in]

other

DG context to be copied.

Member Function Documentation

bool isNormal

(

MStatus *

ReturnStatus = NULL

)

const

Determines if this context is that of "normal" evaluation.

Parameters

[out]

ReturnStatus

Status code

Returns

• true this context is normal
• false this context is not normal

Status Codes:

• MS::kSuccess Method was successful
• MS::kFailure Object error

Examples:

MStatus getTime

(

MTime &

timeVal

)

const

Return the single time for which this context is valid.

The context must be a timed context, i.e. not a normal one.

Parameters

[out]

timeVal

Storage for the time

Returns

Status Code

Status Codes:

• MS::kSuccess The time was successfully returned
• MS::kFailure Context is not timed

MDGContext & operator=

(

const MDGContext &

other

)

Assignment operator.

Copies the RHS into this context.

Parameters

[in]

other

DG context to be copied.

const char * className ( )

static

Returns the name of this class.

Returns

Name of this class.

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The documentation for this class was generated from the following files:

• MDGContext.h
• MDGContext.cpp