Explore the comprehensive overview of C++20 features in this conference talk from C++Now 2019. Dive into the most significant update to the C++ language since C++11, possibly even C++98. Learn about the design-complete C++20 standard, covering major additions and changes to the language. Discover headline features such as Modules, Concepts, and updates to the memory model for parallel threads. Examine the impact on build times, macro isolation, and compatibility with existing code. Gain insights into new library changes, including the C qualifier and other enhancements. Understand the syntax and implementation of Concepts, including subsumption and violation handlers. Benefit from the expertise of Alisdair Meredith, BloombergLP software developer and C++ Standard Committee Library Working Group chair, as he guides you through the landscape of the new language features.