dataBuffer.getDouble() Possible value - NaN and infinite?

mktdata

Hi Team,

We are using RFA C++ version 8.2 to consume market data, and I would like to confirm few things -

Is it possible for dataBuffer.getDouble()

1. return a NaN value?

2. return not finite value?

Thanks in advance!

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Jirapongse

@mktdata

Thank you for reaching out to us.

Is this a conversion from Real to Double? If so, I verified that a Real value cannot be NaN or Infinity.

I also reviewed the RDMFieldDictionary, and it does not define any fields as Double.

mktdata

Hi @Jirapongse

Thank you for your response. It's 'Double'

I understood the fields are of type REAL64, but the API method is I am talking about is →

     /** Returns data as a Double.  The associated set accessor allows specification of select

              *  encodedTypes of LengthSpecified or Bit64Value.

              */

     rfa::common::Double getDouble() const;

Jirapongse

@mktdata

I rechecked it and found the there are hints for NaN and Inf.

	….
                 RSSL_RH_INFINITY		= 33,	/*!< RsslReal represents infinity */
	RSSL_RH_NEG_INFINITY	= 34,	/*!< RsslReal representes negative infinity */
	RSSL_RH_NOT_A_NUMBER	= 35	/*!< RsslReal is not a number (NaN) */
} RsslRealHints;

The dataBuffer.getDouble() method can covert it to inf, -inf, and nan.

	rfa::common::Double double_value;
	switch(dataBuffer.getDataBufferType())
	{
		
		case DataBuffer::RealEnum:
			double_value = dataBuffer.getDouble();
			std::cout << "Real: ";
			std::cout << double_value << std::endl;
			break;

The output is:

        FieldEntry [     6] TRDPRC_1    Real: -inf


        FieldEntry [    22] BID Real: inf


        FieldEntry [    25] ASK Real: nan

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