C++: Polymorphic Allocators, Debug Resources and Custom Types

C++: Polymorphic Allocators, Debug Resources and Custom Types

C++: Polymorphic Allocators, Debug Resources and Custom Types. In this article, take a look at polymorphic allocators and see how to debug sources and custom types.

In my previous article on polymorphic allocators, we discussed some basic ideas. For example, you've seen a pmr::vector that holds pmr::string using a monotonic resource. How about using a custom type in such a container? How to enable it? Let's see.

The Goal

In the previous article there was similar code:

In this case, when you insert a new string into the vector, the new object will also use the memory resource that is specified on the vector.

And by "use" I mean the situation where the string object has to allocate some memory, which means long strings that don't fit into the Short String Optimisation buffer. If the object doesn't require any extra memory block to fetch, then it's just part of the contiguous memory blog of the parent vector.

Since the pmr::string can use the vector's memory resource, it means that it is somehow "aware" of the allocator.

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