More documentation.
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@ -43,18 +43,39 @@ pub struct MemoryDB {
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}
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impl MemoryDB {
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/// Create a new instance of the memory DB.
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pub fn new() -> MemoryDB {
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MemoryDB {
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data: HashMap::new()
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}
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}
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/// Clear all data from the database.
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///
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/// # Examples
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/// ```rust
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/// extern crate ethcore_util;
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/// use ethcore_util::hashdb::*;
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/// use ethcore_util::memorydb::*;
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/// fn main() {
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/// let mut m = MemoryDB::new();
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/// let hello_bytes = "Hello world!".as_bytes();
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/// let hash = m.insert(hello_bytes);
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/// assert!(m.exists(&hash));
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/// m.clear();
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/// assert!(!m.exists(&hash));
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/// }
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/// ```
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pub fn clear(&mut self) {
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self.data.clear();
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}
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/// Purge all zero-referenced data from the database.
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pub fn purge(&mut self) {
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let empties: Vec<_> = self.data.iter().filter(|&(_, &(_, rc))| rc <= 0).map(|(k, _)| k.clone()).collect();
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let empties: Vec<_> = self.data.iter()
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.filter(|&(_, &(_, rc))| rc == 0)
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.map(|(k, _)| k.clone())
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.collect();
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for empty in empties { self.data.remove(&empty); }
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}
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}
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