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検索内容:
Glen Ellen
circle-ellipse problem
noun
(object-oriented
programming)
The
problematic
situation
where
a
base
class
contains
methods
which
mutate
an
object
in
a
manner
which
may
invalidate
a
(stronger)
invariant
found
in
a
derived
class,
violating
the
Liskov
substitution
principle.
For
example,
if
a
circle
is
modelled
as
a
subtype
of
an
ellipse,
and
the
ellipse
has
a
method
that
stretches
it
on
one
axis,
the
circle
must
also
implement
that
method
despite
it
making
no
sense
for
a
circle.
Elland
name
elliptic spring
bi-elliptic transfer
noun
(astronautics)
A
type
of
movement
of
a
spacecraft
from
one
orbit
to
another,
in
which
the
spacecraft
first
raises
its
apoapsis
to
an
extremely
high
altitude,
then,
at
the
new,
higher,
apoapsis,
performs
an
engine
burn
to
change
its
periapsis
to
that
of
the
desired
orbit,
and,
finally,
upon
reaching
the
new
periapsis,
performs
a
third
burn
to
lower
the
eccentricity
of
its
orbit
and
circularize
in
the
desired
orbit,
or
performs
these
steps
in
reverse
to
move
from
a
higher
to
a
lower
orbit.
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