float Execute ( const [FExpressionObject](API\Plugins\CurveExpression\FExpressionObject) & InExpressionObject, [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< [TOptional](API\Runtime\Core\IO\TOptional)< float >([FName](API\Runtime\Core\UObject\FName) InConstantName)> InConstantEvaluator ) const