C++ keyword: `auto`

Automatic storage duration specifier	(until C++11)
`auto` placeholder type specifier Function declaration with trailing return type	(since C++11)
Structured binding declaration	(since C++17)
Abbreviated function template	(since C++20)
Explicit cast to a prvalue copy	(since C++23)

`decltype` (decltype(auto))	(since C++14)
`register` (Automatic storage duration specifier)	(until C++17)

C++ keyword: auto