What are the new features in C++17?

Question

C++17 is now feature complete, so unlikely to experience large changes. Hundreds of proposals were put forward for C++17. Which of those features were added to C++ in C++17? When using a C++ compiler that supports "C++1z", which of those features are going to be available when the compiler updates to C++17?

Answer 1

A new feature of C++17 was the namespace nesting.

example:

New way:

namespace One::Two::Three {

// Comment

}

Old way:

namespace One {

namespace Two {

namespace Three {

// Comment

}

}

}