How do I write a COM object?

The relationship between programming paradigms and programming languages can be complex since a programming language can support multiple paradigms. For example, C++ is designed to support elements of procedural programming, object-based programming, object-oriented programming, and generic programming. However, designers and programmers decide how to build a program using those paradigm elements. One can write a purely procedural program in C++, one can write a purely object-oriented program in C++, or one can write a program that contains elements of both paradigms.