F90 derived type component as array

Sorry,

is there in F90 some restriction(s) for using of components (which are
really arrays) of derived types
instead of arrays itself ?

I.e. if I have for example something like

TYPE twoarray
real, dimension (:,:) ::A
real, dimension (:,:) ::B
END TYPE twoarray

TYPE(twoarray), DIMENSION(100) ::struct

- may I use struct(k)%B in any place where I may use simple
2-dimensional array ?

BTW, do I understand correctly that (in reality) memory requirements
for twoarray structure are
simple size(A)+size(B), i.e. "mapping" to the memory of this type is
simple "memory for A" and
then "memory for B" w/o any "control" information ?

Mikhail Kuzminsky
Zelinsky Institute of Organic Chemistry
Moscow

.

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