The ornamental design for a roofstructure, substantially as shown.
FIG. 1 is a view in perspective of a roof structure according to my
invention, and representing a view of what may form the front/side, or
rear/side, or vice versa, of such roof structure, but which for ease of
description will be designated as a front/side view.
FIG. 2 is a plan view of the roof structure of FIG. 1.
FIG. 3 is an end elevation view of the roof structure of FIG. 1, according
to the illustrative convention adopted for FIG. 1.
FIGS. 4 and 5 are opposite side elevation views of the roof structure of
FIG. 1.