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INFINITY - cppreference.com

From cppreference.com

Defined in header `<math.h>`		(deprecated in C++26)
Defined in header `<float.h>`		(since C++26)
#define INFINITY /* implementation-defined */		(since C++11)

If the implementation supports an infinity for the type float, the macro INFINITY expands to constant expression of type float which evaluates to positive or unsigned infinity.

Otherwise, 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.	(until C++26)
Otherwise, the macro `INFINITY` is not defined.	(since C++26)

See also

	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]