1 files changed, 24 insertions, 0 deletions
diff --git a/third_party/nix/src/libexpr/symbol-table.cc b/third_party/nix/src/libexpr/symbol-table.cc
new file mode 100644
index 0000000000..2b27ca54c2
--- /dev/null
+++ b/third_party/nix/src/libexpr/symbol-table.cc
@@ -0,0 +1,24 @@
+#include "libexpr/symbol-table.hh"
+
+#include <absl/container/node_hash_set.h>
+#include <absl/strings/string_view.h>
+
+namespace nix {
+
+Symbol SymbolTable::Create(absl::string_view sym) {
+  auto it = symbols_.emplace(sym);
+  const std::string* ptr = &(*it.first);
+  return Symbol(ptr);
+}
+
+size_t SymbolTable::Size() const { return symbols_.size(); }
+
+size_t SymbolTable::TotalSize() const {
+  size_t n = 0;
+  for (auto& i : symbols_) {
+    n += i.size();
+  }
+  return n;
+}
+
+}  // namespace nix