a 'duplicate' - same type,layout,dims; references the same memory block(s) (where applicable).

a 'duplicate' - same type,layout,dims; references the same memory block(s) (where applicable).

These functions are not really part of the interface, but we need them to implement operator()

this implements element_addr in the containing tensor.

this implements element_addr in the containing tensor.

These functions are not really part of the interface, but we need them to implement operator()

this implements element_addr in the containing tensor.

this implements element_addr in the containing tensor.

insert, emplace, try_emplace are all the same if k is trivial type.

insert, emplace, try_emplace are all the same if k is trivial type.

'crate size accounting'

'crate size accounting'

state = 0: never used; 1 = in use; -1 = deleted.

state = 0: never used; 1 = in use; -1 = deleted.