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Added explanatory comment about fetching data from buffered content

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This commit is contained in:
Armin Ronacher 2018-03-20 21:24:00 +01:00
parent e4ef087735
commit 1d92569abc
1 changed files with 6 additions and 0 deletions
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6
serde/src/private/de.rs
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@ -2108,6 +2108,9 @@ impl<'a, 'de, E> Deserializer<'de> for FlatMapDeserializer<'a, 'de, E>
V: Visitor<'de>, V: Visitor<'de>,
{ {
for item in self.0.iter_mut() { for item in self.0.iter_mut() {
// items in the vector are nulled out when used. So we can only use
// an item if it's still filled in and if the field is one we care
// about.
let use_item = match *item { let use_item = match *item {
None => false, None => false,
Some((ref c, _)) => c.as_str().map_or(false, |x| variants.contains(&x)) Some((ref c, _)) => c.as_str().map_or(false, |x| variants.contains(&x))
@ -2199,6 +2202,9 @@ impl<'a, 'de, E> MapAccess<'de> for FlatMapAccess<'a, 'de, E>
T: DeserializeSeed<'de>, T: DeserializeSeed<'de>,
{ {
while let Some(item) = self.iter.next() { while let Some(item) = self.iter.next() {
// items in the vector are nulled out when used. So we can only use
// an item if it's still filled in and if the field is one we care
// about. In case we do not know which fields we want, we take them all.
let use_item = match *item { let use_item = match *item {
None => false, None => false,
Some((ref c, _)) => { Some((ref c, _)) => {