C++ keywords completion
CLion uses Clangd code snippets in C++ keywords completion. The snippets work similarly to live templates: when you start typing a keyword, you can select the snippet from the completion list and use Tab to move between stubs.
Find the full list of the currently available snippets on this Confluence page. A few examples are given below:
typedefkeyword, completion suggests not only the keyword itself but also stubs for the type and the new name.
namespace, CLion suggests several snippets that you can select from depending on the use case.
Also, there are sets of snippets for templates and C++ concepts. For example, here is how you can quickly define a new concept in your code: