C++20 and C++23 are the upcoming versions of the C++ programming language, expected to be released in 2023 and 2024, respectively. These new versions will introduce a number of new features and improvements, including:
- Modules: A new modularization system that will make it easier to organize and reuse code.
- Concepts: A new way to express constraints on templates, making it easier to write generic code.
- Coroutines: A new way to write asynchronous code, making it easier to write concurrent and parallel programs.
- Ranges: A new library for working with ranges of elements, making it easier to write generic algorithms.
These new features will make C++ a more powerful and expressive language, and will make it easier to write correct and efficient code. C++20 and C++23 are major releases that will have a significant impact on the way C++ is used.