[Properties (by Name)] [Methods (by Name)] [Events (by Name)]
Internally used class for unary operations with single operand
Source position: fpexprpars.pp line 365
type TFPUnaryOperator = class(TFPExprNode) |
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public |
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constructor Create(); |
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Create unary operator with operand |
destructor Destroy; override; |
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Destroy unary operator and free resources |
procedure InitAggregate; override; |
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Initialize aggregate processing for unary operator |
procedure UpdateAggregate; override; |
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Update aggregate calculations for unary operator |
function HasAggregate; override; |
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Check if unary operator contains aggregates |
procedure Check; override; |
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Validate the unary operator for correctness |
property Operand: TFPExprNode; [r] |
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The operand expression of the unary operator |
end; |
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Internally used class for unary operations with single operand |
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Class for representing nodes in expression trees |
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TFPUnaryOperator is the base class for all unary operations in the expression parser. Unary operations take a single operand and perform some operation to produce a result. It extends TFPExprNode to provide the foundation for all single-operand operations.
The class manages the operand node and provides common functionality such as aggregate handling, validation, and resource management that is shared by all unary operations.
Derived classes implement specific operations such as logical NOT, numeric negation, and type conversions. Each operation defines its own evaluation logic while leveraging the common unary operation infrastructure.
This class is used internally by the TFPExpressionParser class to construct an AST (Abstract Syntax Tree). There is normally no need for you to use or instantiate this class directly.
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Class for representing nodes in expression trees |