Ready for release 1.1-C++23

Author: cpp-tutor

README.md

@@ -2,15 +2,17 @@
 
 ## Contents
 
-All of the source Markdown pages for the Modern C++ Tutorial on https://learnmoderncpp.com/ plus complete, working programs from the course text.
+All of the source Markdown pages for the Modern C++ Tutorial on https://learnmoderncpp.com/ plus complete, working programs machine-extracted from the course text.
+
+**Note:** Some Chapters have had significant changes made to update them to C++23, and not all programs compile successfully yet. In particular, use of `std::println()` with `import std;` does not compile. In case of issues with your compiler please see the Releases page for the C++20 version of the Tutorial.
 
 The "headers" subdirectory contains C++ programs with legacy header `#includes`, whilst the "modules" subdirectory contains the same programs using the `import` keyword instead. See https://learnmoderncpp.com/2020/09/05/where-are-c-modules/ for more details about C++ compilers which have support for modules.
 
 The "scripts" subdirectory contains a C++ program which extracts all programs from the Markdown source to the above two folders.
 
 ## Compiling under Windows
 
-Most programs compile successfully under Windows with Visual Studio 2022 (v17.5 or later), some of the modules versions do not currently compile.
+Most programs compile successfully under Windows with Visual Studio 2022 (v17.8 or later), some of the modules versions (as noted above) do not currently compile.
 
 The supplied batch scripts `build-vs2022-headers.bat` and `build-vs2022-modules.bat` can be used to compile all of the programs within a Visual Studio command prompt, simply run:
 
@@ -20,7 +22,7 @@ C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvar
 
 or similar in a command window, or create a desktop link, and then run either of the build scripts.
 
-Alternatively, to compile individual programs from within a Visual Studio command prompt run either (modules):
+Alternatively, to compile individual programs from within a Visual Studio command prompt, run either (modules):
 
 ```
 cl /EHsc /std:c++latest /MTd 00-example.cpp
@@ -39,13 +41,13 @@ substituting the correct file for `00-example.cpp` in either case. Note that the
 To compile individual programs in the "headers" subdirectory under Linux, use:
 
 ```
-g++ -std=c++20 -o 00-example 00-example.cpp
+g++ -std=c++23 -o 00-example 00-example.cpp
 ```
 
 or:
 
 ```
-clang++ -std=c++20 -o 00-example 00-example.cpp
+clang++ -std=c++23 -o 00-example 00-example.cpp
 ```
 
 substituting both occurrencies of `00-example` with the correct file name.