Class TSpecifiedHeadOnLayer

Unit

GIS_Functions

Declaration

type TSpecifiedHeadOnLayer = class(TExpression)

Description

TExpression is the compiled version of an Expression generated by the TRbwParser.Compile method.

It can be evaluated by using the Evaluate method and the result can then be read using the BooleanResult method, DoubleResult method, IntegerResult method, or StringResult method. The correct one to read can be determined from the ResultType property.

Every instance of TExpression is owned by the instance of TRbwParser that compiled it.

Hierarchy

• TObject
• TConstant
• TCustomValue
• TExpression
• TSpecifiedHeadOnLayer

Overview

Methods

	function GetVariablesUsed: TStringList; override;
	function UsesVariable(const Variable: TCustomVariable): boolean; override;

Description

Methods

	function GetVariablesUsed: TStringList; override;

	function UsesVariable(const Variable: TCustomVariable): boolean; override;
UsesVariable returns True if Variable is used by the TExpression or if the variable is named "Specified_Head".