 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.
  Notes  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) 
  

    
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