Specs

drop(prefix(), non_neg_integer()) :: prefix()

Drops count lsb bits from given pfx.

If count exceeds the actual number of bits in pfx, simply drops all bits.

Examples

iex> drop("1.2.3.0/31", 1)
"1.2.3.0/30"

iex> drop("1.2.3.2/31", 1)
"1.2.3.0/30"

iex> drop("1.2.3.128/25", 1)
"1.2.3.0/24"

iex> drop("1.1.1.130/31", 1)
"1.1.1.128/30"

# drops all
iex> drop("1.2.3.0/24", 512)
"0.0.0.0/0"

iex> drop("2001:0db8:85a3:0000:0000:8a2e:0370:7334", 64)
"2001:db8:85a3::/64"

iex> drop({1, 2, 3, 4}, 8)
{1, 2, 3, 0}

iex> drop({{1, 2, 3, 4}, 32}, 16)
{{1, 2, 0, 0}, 16}

iex> drop(%Pfx{bits: <<1, 2, 3, 4>>, maxlen: 32}, 16)
%Pfx{bits: <<1, 2>>, maxlen: 32}