1 //===-- llvm/ADT/hash_set - "Portable" wrapper around hash_set --*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 // This file provides a wrapper around the mysterious <hash_set> header file
12 // that seems to move around between GCC releases into and out of namespaces at
13 // will. #including this header will cause hash_set to be available in the
16 //===----------------------------------------------------------------------===//
18 #ifndef LLVM_ADT_HASH_SET
19 #define LLVM_ADT_HASH_SET
21 // Compiler Support Matrix
23 // Version Namespace Header File
25 // 3.0.4 std ext/hash_set
26 // 3.1 __gnu_cxx ext/hash_set
29 #undef HAVE_GNU_EXT_HASH_SET
30 #undef HAVE_STD_EXT_HASH_SET
31 #undef HAVE_GLOBAL_HASH_SET
33 // GCC versions 3.1 and later put hash_set in <ext/hash_set> and in
34 // the __gnu_cxx namespace.
35 #if HAVE_GNU_EXT_HASH_SET
36 # include <ext/hash_set>
37 # ifndef HASH_NAMESPACE
38 # define HASH_NAMESPACE __gnu_cxx
41 // GCC 3.0.x puts hash_set in <ext/hash_set> and in the std namespace.
42 #elif HAVE_STD_EXT_HASH_SET
43 # include <ext/hash_set>
44 # ifndef HASH_NAMESPACE
45 # define HASH_NAMESPACE std
48 // Older compilers such as GCC before version 3.0 do not keep
49 // extensions in the `ext' directory, and ignore the `std' namespace.
50 #elif HAVE_GLOBAL_HASH_SET
52 # ifndef HASH_NAMESPACE
53 # define HASH_NAMESPACE std
56 // Give a warning if we couldn't find it, instead of (or in addition to)
57 // randomly doing something dumb.
59 # warning "Autoconfiguration failed to find the hash_set header file."
62 using HASH_NAMESPACE::hash_set;
63 using HASH_NAMESPACE::hash;
65 // Include vector because ext/hash_set includes stl_vector.h and leaves
66 // out specializations like stl_bvector.h, causing link conflicts.
69 #include "llvm/ADT/HashExtras.h"