example listing

examples/list.rs

@@ -0,0 +1,10 @@
+extern crate apt_pkg_native;
+
+use apt_pkg_native::Cache;
+
+fn main() {
+    let mut cache = Cache::get_singleton();
+    for item in cache.iter().map(|item| item.pretty_print()) {
+        println!("{}", item);
+    }
+}