# Standard library header <version> (C++20)

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< cpp‎ | header

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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