hash_map and hash_set:

[oota-llvm.git] / include / Support / hash_map

diff --git a/include/Support/hash_map b/include/Support/hash_map
index aefcc289e2ed0210185ec0c746978e24b6d7d5ae..b6eda7a0127ef4594c20986ae893612c9f501ebd 100644 (file)
--- a/include/Support/hash_map
+++ b/include/Support/hash_map
@@ -1,6 +1,55 @@
-#if __GNUC__ == 3
+//===-- Support/hash_map - "Portable" wrapper around hash_map ---*- C++ -*-===//
+// vim:ft=cpp
+// 
+// This file provides a wrapper around the mysterious <hash_map> header file
+// that seems to move around between GCC releases into and out of namespaces at
+// will.  #including this header will cause hash_map to be available in the
+// global namespace.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SUPPORT_HASH_MAP
+#define SUPPORT_HASH_MAP
+
+// Compiler Support Matrix
+//
+// Version   Namespace   Header File
+//  2.95.x       ::        hash_map
+//  3.0.4       std      ext/hash_map
+//  3.1      __gnu_cxx   ext/hash_map
+//
+
+#include "Config/config.h"
+
+#ifdef HAVE_GNU_EXT_HASH_MAP
+// This is for GCC-3.1+ which puts hash in ext/hash_map
 #include <ext/hash_map>
-using __gnu_cxx::hash_map;
+#define HASH_NAMESPACE __gnu_cxx
+
 #else
+
+// This is for GCC-3.0.x which puts hashmap in the `ext' directory.
+#ifdef HAVE_STD_EXT_HASH_MAP
+#include <ext/hash_map>
+#define HASH_NAMESPACE std
+
+#else
+// This handles older, pre-3.0 GCC which do not have the extentions in the `ext'
+// directory, and ignore the `std' namespace.
 #include <hash_map>
+#define HASH_NAMESPACE std
+#endif
+
+#endif
+
+using HASH_NAMESPACE::hash_map;
+using HASH_NAMESPACE::hash_multimap;
+using HASH_NAMESPACE::hash;
+
+// Include vector because ext/hash_map includes stl_vector.h and leaves
+// out specializations like stl_bvector.h, causing link conflicts.
+#include <vector>
+
+#include <Support/HashExtras.h>
+
 #endif