Use C++20 (#3050)

docs/src/dev/mlx_in_cpp.rst

@@ -45,7 +45,7 @@ The next step is to setup a CMake file in ``CMakeLists.txt``:
 
   project(example LANGUAGES CXX)
 
-  set(CMAKE_CXX_STANDARD 17)
+  set(CMAKE_CXX_STANDARD 20)
   set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 

docs/src/install.rst

@@ -83,7 +83,7 @@ Build from source
 Build Requirements
 ^^^^^^^^^^^^^^^^^^
 
-- A C++ compiler with C++17 support (e.g. Clang >= 5.0)
+- A C++ compiler with C++20 support (e.g. Clang >= 15.0)
 - `cmake <https://cmake.org/>`_ -- version 3.25 or later, and ``make``
 - Xcode >= 15.0 and macOS SDK >= 14.0