TFPUnaryOperator¶

Internally used class for unary operations with single operand

Declaration¶

Source position: fpexprpars.pp line 365

type

  TFPUnaryOperator = class(TFPExprNode)
  public
    constructor Create;
    destructor Destroy;
    procedure InitAggregate;
    procedure UpdateAggregate;
    function HasAggregate : Boolean;
    procedure Check;
    property Operand: TFPExprNode; {r}
  end;

Inheritance¶

Description¶

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.

Properties¶

Member	Visibility	Description
Operand read only	public	The operand expression of the unary operator

See all Properties

Methods¶

Member	Visibility	Description
Check	public	Validate the unary operator for correctness
Create	public	Create unary operator with operand
Destroy	public	Destroy unary operator and free resources
HasAggregate	public	Check if unary operator contains aggregates
InitAggregate	public	Initialize aggregate processing for unary operator
UpdateAggregate	public	Update aggregate calculations for unary operator

See all Methods