Struct cros_async::mem::MemRegionIter
source · pub struct MemRegionIter<'a> {
regions: &'a [MemRegion],
skip_bytes: usize,
remaining_bytes: usize,
}
Expand description
Iterator over an ordered list of MemRegion
.
In addition to the usual iterator operations, MemRegionIter
provides extra functionality that
allows subslicing individual memory regions without mutating the underlying list:
skip_bytes()
: Advance the iterator some number of bytes, potentially starting iteration in the middle of aMemRegion
.take_bytes()
: Truncate the iterator at some number of bytes, potentially ending iteration in the middle of aMemRegion
.
The order of subslicing operations matters - limiting length followed by skipping bytes is not the same as skipping bytes followed by limiting length.
Fields§
§regions: &'a [MemRegion]
§skip_bytes: usize
§remaining_bytes: usize
Implementations§
source§impl<'a> MemRegionIter<'a>
impl<'a> MemRegionIter<'a>
sourcepub fn new(regions: &'a [MemRegion]) -> Self
pub fn new(regions: &'a [MemRegion]) -> Self
Create a new MemRegion
iterator over a slice of MemRegion
.
By default, the MemRegionIter
will iterate over each MemRegion
in the list in its
entirety. Call skip_bytes()
and/or
take_bytes()
to limit iteration to a sub-slice of the specified
regions
list.
sourcepub fn skip_bytes(self, offset: usize) -> Self
pub fn skip_bytes(self, offset: usize) -> Self
Advance the iterator by offset
bytes.
This may place the iterator in the middle of a MemRegion
; in this case, the offset and
length of the next MemRegion
returned by next()
will be adjusted to
account for the offset.
Skipping more than the remaining length of an iterator is not an error; if offset
is
greater than or equal to the total number of remaining bytes, future calls to
next()
will simply return None
.
sourcepub fn take_bytes(self, max: usize) -> Self
pub fn take_bytes(self, max: usize) -> Self
Truncate the length of the iterator to max
bytes at most.
This may cause the final MemRegion
returned by next()
to be adjusted so
that its length does not cause the total number of bytes to exceed the requested max
.
If less than max
bytes remain in the iterator already, this function will have no effect.
Only truncation is supported; an iterator cannot be extended, even if it was truncated by a
previous call to take_bytes()
.
Trait Implementations§
source§impl<'a> Clone for MemRegionIter<'a>
impl<'a> Clone for MemRegionIter<'a>
source§impl Iterator for MemRegionIter<'_>
impl Iterator for MemRegionIter<'_>
source§fn next(&mut self) -> Option<Self::Item>
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