I don't get this. Usually I either don't care about how stuff is allocated, or when I care I want to be specific about what allocator should be used where. In t

I don't get this. Usually I either don't care about how stuff is allocated, or when I care I want to be specific about what allocator should be used where. In the second situation just setting a global allocator wouldn't cut it most of the time, I would want support for customization when I instantiate a data structure.