Pfx.bits
You're seeing just the function
bits, go back to Pfx module for more information.
Specs
Return the concatenation of 1 or more series of bits of the given pfx.
Examples
iex> bits("1.2.3.4", [{0, 8}, {-1, -8}])
<<1, 4>>
iex> bits("1.2.3.0/24", [{0, 8}, {-1, -8}])
<<1, 0>>
iex> bits({1, 2, 3, 4}, [{0, 8}, {-1, -8}])
<<1, 4>>
iex> bits({{1, 2, 3, 0}, 24}, [{0,8}, {-1, -8}])
<<1, 0>>
iex> bits(%Pfx{bits: <<1, 2, 3, 4>>, maxlen: 32}, [{0,8}, {-1, -8}])
<<1, 4>>
Specs
Return a series of bits for given pfx, for starting position & length.
Negative position's are relative to the end of the pfx.bits bitstring,
while negative length will collect bits going left instead of to the
right. Note that the bit at given position is always included in the
result regardless of direction. Finally, a length of 0 results in
an empty bitstring.
Examples
# last two bytes
iex> bits("128.0.128.1", 16, 16)
<<128, 1>>
iex> bits({128, 0, 128, 1}, 16, 16) # same
<<128, 1>>
iex> bits({128, 0, 128, 1}, 31, -16) # same
<<128, 1>>
iex> bits({{128, 0, 128, 1}, 32}, 31, -16) # same
<<128, 1>>
# first byte
iex> bits(%Pfx{bits: <<128, 0, 0, 1>>, maxlen: 32}, 0, 8)
<<128>>
# same as
iex> bits(%Pfx{bits: <<128, 0, 0, 1>>, maxlen: 32}, 7, -8)
<<128>>
# missing bits are filled in as `0`
iex> x = new(<<128>>, 32)
iex> bits(x, 0, 32)
<<128, 0, 0, 0>>
iex> x = new(<<128>>, 32)
iex> bits(x, 0, 16)
<<128, 0>>
iex> x = new(<<128>>, 32)
iex> bits(x, 15, -16)
<<128, 0>>
# the last 5 bits
iex> x = new(<<255>>, 32)
iex> bits(x, 7, -5)
<<0b11111::size(5)>>