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use std::collections::hash_map;
use std::collections::HashMap;
use std::hash::Hash;
use super::value::ProtobufValue;
/// Implemented for `HashMap` with appropriate keys and values
pub trait ReflectMap: 'static {
fn reflect_iter(&self) -> ReflectMapIter;
fn len(&self) -> usize;
}
impl<K: ProtobufValue + Eq + Hash + 'static, V: ProtobufValue + 'static> ReflectMap
for HashMap<K, V>
{
fn reflect_iter<'a>(&'a self) -> ReflectMapIter<'a> {
ReflectMapIter {
imp: Box::new(ReflectMapIterImpl::<'a, K, V> { iter: self.iter() }),
}
}
fn len(&self) -> usize {
HashMap::len(self)
}
}
trait ReflectMapIterTrait<'a> {
fn next(&mut self) -> Option<(&'a dyn ProtobufValue, &'a dyn ProtobufValue)>;
}
struct ReflectMapIterImpl<'a, K: Eq + Hash + 'static, V: 'static> {
iter: hash_map::Iter<'a, K, V>,
}
impl<'a, K: ProtobufValue + Eq + Hash + 'static, V: ProtobufValue + 'static> ReflectMapIterTrait<'a>
for ReflectMapIterImpl<'a, K, V>
{
fn next(&mut self) -> Option<(&'a dyn ProtobufValue, &'a dyn ProtobufValue)> {
match self.iter.next() {
Some((k, v)) => Some((k as &dyn ProtobufValue, v as &dyn ProtobufValue)),
None => None,
}
}
}
pub struct ReflectMapIter<'a> {
imp: Box<dyn ReflectMapIterTrait<'a> + 'a>,
}
impl<'a> Iterator for ReflectMapIter<'a> {
type Item = (&'a dyn ProtobufValue, &'a dyn ProtobufValue);
fn next(&mut self) -> Option<(&'a dyn ProtobufValue, &'a dyn ProtobufValue)> {
self.imp.next()
}
}
impl<'a> IntoIterator for &'a dyn ReflectMap {
type IntoIter = ReflectMapIter<'a>;
type Item = (&'a dyn ProtobufValue, &'a dyn ProtobufValue);
fn into_iter(self) -> Self::IntoIter {
self.reflect_iter()
}
}
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