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Internally used class for conditional if-then-else operations
Source position: fpexprpars.pp line 260
type TIfOperation = class(TFPBinaryOperation) |
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public |
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procedure Check; override; |
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Validate the conditional operation for correctness |
procedure InitAggregate; override; |
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Initialize aggregate processing for if operation |
procedure UpdateAggregate; override; |
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Update aggregate calculations for if operation |
function HasAggregate; override; |
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Check if conditional operation contains aggregates |
function NodeType; override; |
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Get the result type for conditional operation |
constructor Create(); |
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Create conditional operation with condition and branches |
destructor destroy; override; |
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Destroy conditional operation and free resources |
function AsString; override; |
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Get string representation of conditional operation |
property Condition: TFPExprNode; [r] |
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The condition expression of the if operation |
end; |
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Internally used class for conditional if-then-else operations |
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Internally used class for binary operations with left and right operands |
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Class for representing nodes in expression trees |
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The TIfOperation class implements conditional if-then-else operations in expressions, allowing for branching logic based on boolean conditions. It extends the expression framework to provide conditional evaluation similar to the ternary operator in many programming languages.
The operation evaluates a boolean condition and returns one of two expressions based on the result: the "then" expression if the condition is True, or the "else" expression if the condition is False. This enables complex conditional logic within expressions.
The class manages three operands: the condition (which must evaluate to boolean), the "then" expression (evaluated when condition is True), and the "else" expression (evaluated when condition is False). Only one of the result expressions is evaluated, providing efficient conditional processing.
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 |