1 files changed, 40 insertions, 0 deletions
diff --git a/include/llvm/ADT/HashExtras.h b/include/llvm/ADT/HashExtras.h
new file mode 100644
index 000000000000..20c4fd3058a2
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+++ b/include/llvm/ADT/HashExtras.h
@@ -0,0 +1,40 @@
+//===-- llvm/ADT/HashExtras.h - Useful functions for STL hash ---*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains some templates that are useful if you are working with the
+// STL Hashed containers.
+//
+// No library is required when using these functions.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ADT_HASHEXTRAS_H
+#define LLVM_ADT_HASHEXTRAS_H
+
+#include <string>
+
+// Cannot specialize hash template from outside of the std namespace.
+namespace HASH_NAMESPACE {
+
+// Provide a hash function for arbitrary pointers...
+template <class T> struct hash<T *> {
+  inline size_t operator()(const T *Val) const {
+    return reinterpret_cast<size_t>(Val);
+  }
+};
+
+template <> struct hash<std::string> {
+  size_t operator()(std::string const &str) const {
+    return hash<char const *>()(str.c_str());
+  }
+};
+
+}  // End namespace std
+
+#endif