JSON in C++: designing a type for working with JSON values

We'll dive into designing a C++ type for wroking with JSON values. We will:

• remind ourselves some basic ideas and nuances of type design in C++,
• carefully look back at the standard containers and std::variant,
• try to make the interface easy to use correctly and hard to use incorrectly,
• and add support for C++ allocators.

After the talk, among other things, you will have good idea of how to cook std::variant.