improve docs( example/cpp11/server.cpp )

[keeAzlynth]

The source code in this repository is generated from an upstream repository at https://github.com/chriskohlhoff/asio.

For historical reasons, the old examples are commented out (not deleted) so that other readers can still reference them.

Rationale

• API Compatibility: The io_context allocator constructor was removed in Boost 1.87+ but examples still reference it

• Modern C++ Standards: std::aligned_storage is deprecated in C++23

• Best Practices: Handler-level allocation remains the recommended approach for performance optimization

• User Experience: Prevents compilation errors and confusion for users following official examples

Testing

• Verified examples compile with Boost 1.89+

• Confirmed compatibility with C++17, C++20, and upcoming C++23 standards

• Ensured handler allocation functionality remains intact

Please consid

er raising new pull requests at https://github.com/chriskohlhoff/asio/pulls.

[keeAzlynth]

Sorry about this information
Related Issues
Boost version compatibility notes

C++23 deprecation of std::aligned_storage

Documentation synchronization with API changes

[nigels-com]

Perhaps a C++20 or C++23 version added, rather than modifying the "works just fine on C++11" one.