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Use unordered_map when available. Changes to stl_hash.m4 provided by Oleg Smolsky.

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This commit is contained in:
kenton@google.com 2009-12-21 18:58:23 +00:00
parent 8ee1474044
commit ee7e9420e3
3 changed files with 40 additions and 17 deletions
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1
CONTRIBUTORS.txt
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@ -58,6 +58,7 @@ Patch contributors:
* Slicing support for repeated scalar fields for the Python API.
Oleg Smolsky <oleg.smolsky@gmail.com>
* MS Visual Studio error format option.
* Detect unordered_map in stl_hash.m4.
Brian Olson <brianolson@google.com>
* gzip/zlib I/O support.
Michael Poole <mdpoole@troilus.org>

39
m4/stl_hash.m4
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@ -14,28 +14,39 @@ AC_DEFUN([AC_CXX_STL_HASH],
[AC_MSG_CHECKING(the location of hash_map)
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_cv_cxx_hash_map=""
for location in ext/hash_map hash_map; do
for namespace in __gnu_cxx "" std stdext; do
if test -z "$ac_cv_cxx_hash_map"; then
AC_TRY_COMPILE([#include <$location>],
[${namespace}::hash_map<int, int> t],
[ac_cv_cxx_hash_map="<$location>";
ac_cv_cxx_hash_namespace="$namespace";])
fi
ac_cv_cxx_hash_map_header=""
ac_cv_cxx_hash_map_class=""
for location in [tr1/unordered_map ext/hash_map hash_map]; do
for namespace in [std::tr1 __gnu_cxx "" std stdext]; do
for name in [unordered_map hash_map]; do
if test -z "$ac_cv_cxx_hash_map_header"; then
AC_TRY_COMPILE([#include <$location>],
[${namespace}::$name<int, int> t],
[ac_cv_cxx_hash_map_header="<$location>";
ac_cv_cxx_hash_namespace="$namespace";
ac_cv_cxx_hash_map_class="$name";])
fi
done
done
done
ac_cv_cxx_hash_set=`echo "$ac_cv_cxx_hash_map" | sed s/map/set/`;
if test -n "$ac_cv_cxx_hash_map"; then
ac_cv_cxx_hash_set_header=`echo "$ac_cv_cxx_hash_map_header" | sed s/map/set/`;
ac_cv_cxx_hash_set_class=`echo "$ac_cv_cxx_hash_map_class" | sed s/map/set/`;
if test -n "$ac_cv_cxx_hash_map_header"; then
AC_DEFINE(HAVE_HASH_MAP, 1, [define if the compiler has hash_map])
AC_DEFINE(HAVE_HASH_SET, 1, [define if the compiler has hash_set])
AC_DEFINE_UNQUOTED(HASH_MAP_H,$ac_cv_cxx_hash_map,
AC_DEFINE_UNQUOTED(HASH_MAP_H,$ac_cv_cxx_hash_map_header,
[the location of <hash_map>])
AC_DEFINE_UNQUOTED(HASH_SET_H,$ac_cv_cxx_hash_set,
AC_DEFINE_UNQUOTED(HASH_SET_H,$ac_cv_cxx_hash_set_header,
[the location of <hash_set>])
AC_DEFINE_UNQUOTED(HASH_MAP_CLASS,$ac_cv_cxx_hash_map_class,
[the name of <hash_set>])
AC_DEFINE_UNQUOTED(HASH_SET_CLASS,$ac_cv_cxx_hash_set_class,
[the name of <hash_set>])
AC_DEFINE_UNQUOTED(HASH_NAMESPACE,$ac_cv_cxx_hash_namespace,
[the namespace of hash_map/hash_set])
AC_MSG_RESULT([$ac_cv_cxx_hash_map])
AC_MSG_RESULT([$ac_cv_cxx_hash_map_header])
else
AC_MSG_RESULT()
AC_MSG_WARN([could not find an STL hash_map])

17
src/google/protobuf/stubs/hash.h
View File

@ -48,6 +48,8 @@
#include <set>
#endif
#include <ext/hash_map>
namespace google {
namespace protobuf {
@ -145,21 +147,30 @@ struct hash<const Key*> {
}
};
// Unlike the old SGI version, the TR1 "hash" does not special-case char*. So,
// we go ahead and provide our own implementation.
template <>
struct hash<const char*> : public HASH_NAMESPACE::hash<const char*> {
struct hash<const char*> {
inline size_t operator()(const char* str) const {
size_t result = 0;
for (; *str != '\0'; str++) {
result = 5 * result + *str;
}
return result;
}
};
template <typename Key, typename Data,
typename HashFcn = hash<Key>,
typename EqualKey = std::equal_to<Key> >
class hash_map : public HASH_NAMESPACE::hash_map<
class hash_map : public HASH_NAMESPACE::HASH_MAP_CLASS<
Key, Data, HashFcn, EqualKey> {
};
template <typename Key,
typename HashFcn = hash<Key>,
typename EqualKey = std::equal_to<Key> >
class hash_set : public HASH_NAMESPACE::hash_set<
class hash_set : public HASH_NAMESPACE::HASH_SET_CLASS<
Key, HashFcn, EqualKey> {
};