Which of the following operations do bidirectional iterators have?
a) Prefix operator* to make available the container element for use as l-value or
r-value.
b) Overloaded operator+ to add an int value to the iterator to move the place
the iterator points forward by the argument number of elements.
c) Overloaded operator* to multiply the iterator by an int value to move the
place the iterator points by a number of elements equal to the argument.
d) Overloaded operator++ to move the place the iterator points forward by one
element.
e) Overloaded operator-- to move the place the iterator points backward by one
element.
f) Overloaded operator== and operator!= to determine whether two
iterators point to the same element.
a) Prefix operator* to make available the container element for use as l-value or
r-value
d) Overloaded operator++ to move the place the iterator points forward by one
element.
e) Overloaded operator-- to move the place the iterator points backward by one
element.
f) Overloaded operator== and operator!= to determine whether two
iterators point to the same element.
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We’ve seen that if you increment the source picture index by 2 while incrementing the target picture index by 1 for each copied pixel, you end up with the source being scaled down onto the target. What happens if you increment the target picture index by 2 as well? What happens if you increment both by 0.5 and use int to get just the integer part?
If one increments the target picture index by 2 as well then one ends up copying over every other pixel.