1 files changed, 27 insertions, 0 deletions
diff --git a/include/Support/HashExtras.h b/include/Support/HashExtras.h
new file mode 100644
index 0000000000..6ea831e78f
--- /dev/null
+++ b/include/Support/HashExtras.h
@@ -0,0 +1,27 @@
+//===-- HashExtras.h - Useful functions for STL hash containers --*- C++ -*--=//
+//
+// This file contains some templates that are useful if you are working with the
+// STL Hashed containers.
+//
+// No library is required when using these functinons.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_HASHEXTRAS_H
+#define LLVM_SUPPORT_HASHEXTRAS_H
+
+#include <string>
+#include <hash_map>
+
+template <> struct hash<string> {
+  size_t operator()(string const &str) const {
+    return hash<char const *>()(str.c_str());
+  }
+};
+
+// Provide a hash function for arbitrary pointers...
+template <class T> struct hash<T *> {
+  inline size_t operator()(const T *Val) const { return (size_t)Val; }
+};
+
+#endif