Multiple containers share a single memory resource

Question

In my project, I'm trying to use the std::pmr allocator and monotonic_buffer_resource. I'm using vector in various classes, and I need to use the same resource in all of them. I created a separate free function that returns the resource pointer and used it while declaring the vectors. Here is the code

#include <memory_resource>
#include <vector>
#include <array>

std::pmr::monotonic_buffer_resource *getMemoryResource()
{
    static std::array<std::byte, 100000> buffer;
    static std::pmr::monotonic_buffer_resource resource{buffer.data(), buffer.size()};
    return &resource;
}
struct JsonData
{
    std::pmr::vector<int> data{getMemoryResource()};
};
struct XMLData
{
    std::pmr::vector<char> data{getMemoryResource()};
};

Is there anything I can do to improve the code, especially getMemoryResource function?

Answer 1

Since there is so little code to review I only have one observation to make:

Magic Numbers

There is a Magic Numbers in the getMemoryResource() function (100000), it might be better to create a symbolic constant for it to make the code more readable and easier to maintain. These numbers may be used in many places and being able to change them by editing only one line makes maintenance easier.

Numeric constants in code are sometimes referred to as Magic Numbers, because there is no obvious meaning for them. There is a discussion of this on stackoverflow.