implement <cuda/std/numbers>

docs/libcudacxx/standard_api.rst

@@ -76,6 +76,8 @@ Feature availability:
 
 -  C++20 ``std::assume_aligned`` in ``<memory>`` is available in C++11.
 
+-  C++20 ``<numbers>`` are available in C++14.
+
 -  C++20 ``<ranges>`` are available in C++17.
 
    -  all ``<ranges>`` concepts are available in C++17. However, they

docs/libcudacxx/standard_api/numerics_library.rst

@@ -9,6 +9,7 @@ Numerics Library
 
    numerics_library/bit
    numerics_library/complex
+   numerics_library/numbers
    numerics_library/numeric
 
 Any Standard C++ header not listed below is omitted.
@@ -41,6 +42,9 @@ Any Standard C++ header not listed below is omitted.
    * - `\<cuda/std/cstdint\> <https://en.cppreference.com/w/cpp/header/cstdint>`_
      - Fixed-width integer types
      - libcu++ 1.0.0 / CCCL 2.0.0 / CUDA 10.2
+   * - `\<cuda/std/numbers\> <https://en.cppreference.com/w/cpp/header/numbers>`_
+     - Numeric constants
+     - CCCL 3.0.0
    * - `\<cuda/std/numeric\> <https://en.cppreference.com/w/cpp/header/numeric>`_
      - Numeric algorithms
      - CCCL 2.5.0

docs/libcudacxx/standard_api/numerics_library/numbers.rst

@@ -0,0 +1,9 @@
+.. _libcudacxx-standard-api-numerics-numbers:
+
+``<cuda/std/numbers>``
+======================
+
+Extensions
+----------
+
+-  All features of ``<numbers>`` are made available in C++14 onwards