Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
This is an older version of Boost and was released in 2020. The current version is 1.90.0.
The term "enclosing type" refers to the type which is being introspected. This type is always a class, struct, or union.
The term "inner xxx", where xxx is some element of the enclosing type, refers to either a type, template, function, or data within the enclosing type. The term "inner element" also refers to any one of these entities in general.
I use the term "nested type" to refer to a type within another type. I use the term "member function" or "member data" to refer to non-static functions or data that are part of the enclosing type. I use the term "static member function" or "static member data" to refer to static functions or data that are part of the enclosing type. I use the term "nested class template" to refer to a class template nested within the enclosing type.
Other terminology may be just as valid for the notion of C++ language elements within a type, but I have chosen these terms to be consistent.
The term "generated metafunction(s)" refers to macro metafunctions which are generated by macros.