C / C++ / MFC

// Identifier was truncated to '255' characters in the debug information
#pragma warning (disable: 4786)

typedef __int64 Int64;


//! Check if a number is infinite.
inline bool isInfinite(double A)
{
	// Representation of infinity for double precision number.
	static const Int64 _kInfAsInt = 0x7FF0000000000000;
	
	// An infinity has an exponent of 1023 (shift left 52 positions) and
	// a zero mantissa. There are two infinities - positive and negative.
	if ((*(Int64*)&A & 0x7FFFFFFFFFFFFFFF) == _kInfAsInt)
	{
		return true;
	}
	else
	{
		return false;
	}
}


//! Check if a number is Not-a-Number.
inline bool isNan(double A)
{
	// A NAN has an exponent of 1023 (shifted left 52 positions) and
	// a non-zero mantissa. There are two Nan's - positive and negative.
	Int64 _exp      = *(Int64*)&A & 0x7FF0000000000000;
	Int64 _mantissa = *(Int64*)&A & 0xFFFFFFFFFFFFF;
	
	if(_exp == 0x7FF0000000000000 && _mantissa != 0)
	{
		return true;
	}
	else
	{
		return false;
	}
}

Saurabh.Garg wrote:

I am pretty sure you can resolve conflict by not using you own functions.

--------------------Configuration: ConstATE_B - Win32 Debug--------------------
Linking...
LINK : LNK6004: .\ConstATE_B.exe not found or not built by the last incremental link; performing full link
LIBCMTD.lib(ieeemisc.obj) : error LNK2005: __finite already defined in analysis.lib(isnan.obj)
LIBCMTD.lib(ieeemisc.obj) : error LNK2005: __isnan already defined in analysis.lib(isnan.obj)
.\ConstATE_B.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.
Creating browse info file...

ConstATE_B.exe - 3 error(s), 0 warning(s)

Saurabh.Garg wrote:

I have those functions handy so I will give it anyway.

Jijo raj wrote:

Found another similar function - _fpclass().

toxcct wrote:

why a third party lib would redefine them ?

--------------------Configuration: ConstATE_B - Win32 Debug--------------------
Linking...
LIBCMTD.lib(ieeemisc.obj) : error LNK2005: __finite already defined in analysis.lib(isnan.obj)
LIBCMTD.lib(ieeemisc.obj) : error LNK2005: __isnan already defined in analysis.lib(isnan.obj)
.\ConstATE_B.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.

ConstATE_B.exe - 3 error(s), 0 warning(s)

Nelek wrote:

I am not asking for code, just for opinions, tips or a bit orientation. I am still searching for info and making tiny tests, but if you know a good place with documentation any link will be wellcome.