Standard library header <version> (C++20)
This header is part of the language support library.
This header supplies implementation-dependent information about the standard library (such as implementation-specific library version macros).
Including <version> also defines all library feature-test macros.
Prior to C++20, including <ciso646> is sometimes used for this purpose.
 See also
|Library feature-test macros||defined in the header <version> (C++20)|