hma_allocator anonymous struct warning

[TobiPristupin]

The definition of struct hma_allocator uses an anonymous struct.

typedef struct hma_allocator
{
  int (* allocate)(void *, size_t);
  void (* share)(void *, int);
  void (* deallocate)(void *, int);
  void (* copy_from)(void *, void *, size_t);
  void (* copy_to)(void *, void *, size_t);
  void (* copy)(void *, void *, size_t, struct hma_allocator *);
  void (* unmap)(struct hma_allocator *);
  void * data;   // Implementation specific stuff

  // ---Boundary between local memory and shared memory mapping occurs here---

  int shmem_id;
  union {   // Only allocators in same domain (same device) can use each other's memory
    struct //HERE! Anonymous struct
    {
      uint16_t device_type;
      uint16_t device_number;
    };
    uint32_t domain;
  };
  uint16_t strategy;
} hma_allocator_t;

This produced the following warning: warning: ISO C++ prohibits anonymous structs [-Wpedantic]

This can be fixed by naming the struct, and then refactoring all accesses to device_type and device_number to include the struct's name as a prefix.

I'm assuming all the references to those variables are inside of this project. If some external code accesses this struct and expects a certain naming scheme then this might be very hard to fix and it could be better to just add a compiler directive to skip the warning for this struct.