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> Unreal Engine API Reference > Runtime > Core > Misc > TOptional< FExpressionError >

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TOptional< FExpressionError >

Typedef that defines a function used to consume tokens Definitions may add FExpressionNodes parsed from the provided consumer's stream, or return an optional error.

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References

Module	Core
Header	/Engine/Source/Runtime/Core/Public/Misc/ExpressionParserTypes.h
Include	#include "Misc/ExpressionParserTypes.h"

Syntax

typedef TOptional< FExpressionError >
(
FExpressionDefinition
)

Remarks

Typedef that defines a function used to consume tokens Definitions may add FExpressionNodes parsed from the provided consumer's stream, or return an optional error. Where a definition performs no mutable operations, subsequent token definitions will be invoked.

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