TFPLessThanOperation class
Internally used class for less-than comparison operations
Declaration
TFPLessThanOperation = class(TFPOrderingOperation)Inheritance
- TFPLessThanOperation
- TFPOrderingOperation
- TFPBooleanResultOperation
- TFPBinaryOperation
- TFPExprNode
- TObject
Descends from it: TFPGreaterThanEqualOperation
Description
The TFPLessThanOperation class implements the less-than comparison operation (<)
between two operands of compatible types. It extends TFPOrderingOperation to provide less-than-specific comparison logic.
The operation compares two values and returns True if the left operand is less than the right operand, False otherwise. It handles different data types appropriately, using numeric comparison for numbers, lexicographic comparison for strings, and chronological comparison for date/time values.
Type conversion is performed when necessary to compare values of different but compatible types, ensuring proper ordering across numeric types.
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.
See also
Methods
GetNodeValue | protected | |
AsString | public | Get string representation of less-than operation |
Inherited
From TFPOrderingOperation (1)
From TFPBooleanResultOperation (1)
From TFPBinaryOperation (8)
CheckSameNodeTypes Create Destroy HasAggregate InitAggregate left Right UpdateAggregate
From TFPExprNode (3)
From TObject (40)
AfterConstruction BeforeDestruction CheckDisposed ClassInfo ClassName ClassNameIs ClassParent ClassType CleanupInstance DefaultHandler DefaultHandlerStr Dispatch DispatchStr Disposed DisposeOf Equals FieldAddress Free FreeInstance GetDisposed GetHashCode GetInterface GetInterfaceByStr GetInterfaceEntry GetInterfaceEntryByStr GetInterfaceTable GetInterfaceWeak GetLastCastErrorInfo InheritsFrom InitInstance InstanceSize MethodAddress MethodName newinstance QualifiedClassName SafeCallException StringMessageTable SystemHasExtendedRTTI ToString UnitName
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.