greg/mentat
1
0
Fork 0
Code Issues 294 Pull requests Packages Projects Releases 9 Wiki Activity

Newtype VariableIterator.

Browse source
This commit is contained in:
Richard Newman 2017-06-30 09:14:29 -07:00
parent 5fe3d50762
commit 4aa647ddc5
1 changed files with 14 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
query-algebrizer/src/clauses/mod.rs
View file

@ -264,6 +264,18 @@ impl Default for ConjoiningClauses {
}
}
pub struct VariableIterator<'a>(
::std::collections::btree_map::Keys<'a, Variable, TypedValue>,
);
impl<'a> Iterator for VariableIterator<'a> {
type Item = &'a Variable;
fn next(&mut self) -> Option<&'a Variable> {
self.0.next()
}
}
impl ConjoiningClauses {
/// Construct a new `ConjoiningClauses` with the provided alias counter. This allows a caller
/// to share a counter with an enclosing scope, and to start counting at a particular offset
@ -370,8 +382,8 @@ impl ConjoiningClauses {
}
/// Return an interator over the variables externally bound to values.
pub fn value_bound_variables(&self) -> ::std::collections::btree_map::Keys<Variable, TypedValue> {
self.value_bindings.keys()
pub fn value_bound_variables(&self) -> VariableIterator {
VariableIterator(self.value_bindings.keys())
}
/// Return a set of the variables externally bound to values.