Move prefix-map from build2 to libbutl

1 files changed, 39 insertions, 0 deletions

diff --git a/butl/prefix-map.txx b/butl/prefix-map.txx
new file mode 100644
index 0000000..9ead579
--- /dev/null
+++ b/butl/prefix-map.txx
@@ -0,0 +1,39 @@
+// file      : butl/prefix-map.txx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+namespace butl
+{
+  template <typename M>
+  auto prefix_map_common<M>::
+  find_prefix (const key_type& k) -> std::pair<iterator, iterator>
+  {
+    std::pair<iterator, iterator> r;
+    r.first = this->lower_bound (k);
+
+    for (r.second = r.first; r.second != this->end (); ++r.second)
+    {
+      if (!this->key_comp ().prefix (k, r.second->first))
+        break;
+    }
+
+    return r;
+  }
+
+  template <typename M>
+  auto prefix_map_common<M>::
+  find_prefix (const key_type& k) const ->
+    std::pair<const_iterator, const_iterator>
+  {
+    std::pair<const_iterator, const_iterator> r;
+    r.first = this->lower_bound (k);
+
+    for (r.second = r.first; r.second != this->end (); ++r.second)
+    {
+      if (!this->key_comp ().prefix (k, r.second->first))
+        break;
+    }
+
+    return r;
+  }
+}