XPRBexprContext Class

An XPRBexprContext allows you to easily dispose of intermediate expression objects created while constructing your model. Once an XPRBexprContext has been created, every expression created by that thread will be linked to the context and will be disposed when the XPRBexprContext is disposed.

Inheritance Hierarchy

SystemObject
   BCLXPRBexprContext

Namespace:  BCL
Assembly: xprbdn (in xprbdn.dll) Version: 45.01.02+1f9fd7ff9a8620394fec1839699751312debed40

Syntax

C#

public class XPRBexprContext : IDisposable

VB

Public Class XPRBexprContext
	Implements IDisposable

The XPRBexprContext type exposes the following members.

Constructors

	Name	Description
	XPRBexprContext	Create a new expression context. Any expressions created on this thread from this point onwards will be added to this context, until the context is disposed. If the thread already has an expression context, new expressions will continue to be added to the old context & the new context will not be used.

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Methods

	Name	Description
	Dispose	Free all expressions that are associated with this context.
	Dispose(Boolean)	Releases the unmanaged resources used by the XPRBexprContext and optionally releases the managed resources
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object)
	Finalize	(Overrides ObjectFinalize)
	GetHashCode	Serves as the default hash function. (Inherited from Object)
	GetType	Gets the Type of the current instance. (Inherited from Object)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object)
	ToString	Returns a string that represents the current object. (Inherited from Object)

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Remarks

XPRBexpr objects can be created explicitly or by operator overloading, and once created will normally be retained in memory until .NET decides to garbage collect them. As this can waste significant memory, the XPRBexprContext provides a way to easily dispose of your expressions once they are no longer required, without needing to keep a reference to every individual XPRBexpr.

Example

C#

XPRBprob p = new XPRBprob("Chess");
XPRBvar xs = p.newVar("xs");
XPRBvar xl = p.newVar("xl");
using (XPRBexprContext ctx=new XPRBexprContext()) {
  XPRBexpr woodRequired = xs + 3.0*xl;
  p.newCtr("wood", woodRequired<=200.0 );
  XPRBexpr timeRequired = 3.0*cs + 2.0*xl;
  p.newCtr("mc_time", timeRequired<400.0);
}

See Also

Reference

BCL Namespace

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