INFINITY - cppreference.com

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`#define INFINITY /implementation defined/`		(since C++11)

If the implementation supports floating-point infinities, the macro INFINITY expands to constant expression of type float which evaluates to positive or unsigned infinity.

If the implementation does not support floating-point infinities, the macro INFINITY expands to a positive value that is guaranteed to overflow a float at compile time, and the use of this macro generates a compiler warning.

	checks if the given number is infinite (function) [edit]
	indicates the overflow value for `float`, `double` and `long double` respectively (macro constant) [edit]
	identifies floating-point types that can represent the special value "positive infinity" (public static member constant of `std::numeric_limits<T>`) [edit]
	returns the positive infinity value of the given floating-point type (public static member function of `std::numeric_limits<T>`) [edit]

See also