nread
- bytes to read in
nread
- bytes to read in
rng
- The start of the range specify the minimum of bytes to read in,
while the end of the range specify the maximum of bytes that
can be read in.
If the lower bound is not specified, it is default to 0.
If the upper bound is not specified, it is default to the
capacity of bytes
.
The lower bound must not be larger than the upper bound.
NOTE that this function does not modify any existing data.
rng
- The start of the range specify the minimum of bytes to read in,
while the end of the range specify the maximum of bytes that
can be read in.
If the lower bound is not specified, it is default to 0.
If the upper bound is not specified, it is default to the
capacity of bytes
.
The lower bound must not be larger than the upper bound.
Try to fill data from reader
into the spare capacity of vec
.
rng
- The start of the range specify the minimum of bytes to read in,
while the end of the range specify the maximum of bytes that
can be read in.
If the lower bound is not specified, it is default to 0.
If the upper bound is not specified, it is default to the
capacity of bytes
.
The lower bound must not be larger than the upper bound.
buffer
- must not contain empty Bytes
s.
Return true if the bufs
contains at least one byte.