Move string-table from build2 to libbutl

1 files changed, 33 insertions, 0 deletions

diff --git a/butl/string-table.txx b/butl/string-table.txx
new file mode 100644
index 0000000..3e74997
--- /dev/null
+++ b/butl/string-table.txx
@@ -0,0 +1,33 @@
+// file      : butl/string-table.txx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <limits>  // numeric_limits
+#include <cstddef> // size_t
+#include <cassert>
+
+namespace butl
+{
+  template <typename I, typename D>
+  I string_table<I, D>::
+  insert (const D& d)
+  {
+    std::size_t i (vec_.size () + 1);
+
+    // Note: move(d) would be tricky since the key still points to it.
+    //
+    auto r (map_.emplace (
+              key_type (&traits::key (d)),
+              value_type {static_cast<I> (i), d}));
+
+    if (r.second)
+    {
+      assert (i <= std::numeric_limits<I>::max ());
+
+      r.first->first.p = &traits::key (r.first->second.d); // Update key.
+      vec_.push_back (r.first);
+    }
+
+    return r.first->second.i;
+  }
+}