v		input view
w		argument view

Compare views v and w, return an integer < 0 if v is less than w, or > 0 if v is greater than w, or 0 if v is equal to w.

set x [view A def 1]
set y [view A def {1 2}]
set z [view A def {2 2}]

view $x compare $y

-1

view $y compare $y

0

view $y compare $x

1

view $y compare $z

-1

view $z compare $y

1