#define NAN /*implementation defined*/
(since C++11)The macro NAN expands to constant expression of type float which evaluates to a quiet not-a-number (QNaN) value. If the implementation does not support QNaNs, this macro constant is not defined.
There are many different NaN values, differentiated by their payloads and their sign bits. The contents of the payload and the sign bit of the NaN generated by the macro NAN are implementation-defined.
std::numeric_limits<T>) [edit] identifies floating-point types that can represent the special value "signaling not-a-number" (NaN)
std::numeric_limits<T>) [edit] returns a quiet NaN value of the given floating-point type
std::numeric_limits<T>) [edit] returns a signaling NaN value of the given floating-point type
std::numeric_limits<T>) [edit]
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