Re-committing http://codereview.chromium.org/8736001/ originally committed revision=112305

third_party/libphonenumber/cpp/src/regexp_cache.cc

-// Copyright (C) 2011 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// Author: Fredrik Roubert
-
-#include "regexp_cache.h"
-
-#include <cstddef>
-#include <string>
-#include <utility>
-
-#include "base/logging.h"
-#include "base/synchronization/lock.h"
-#include "regexp_adapter.h"
-
-using std::string;
-
-namespace i18n {
-namespace phonenumbers {
-
-using base::AutoLock;
-
-RegExpCache::RegExpCache(size_t min_items)
-#ifdef USE_TR1_UNORDERED_MAP
-    : cache_impl_(new CacheImpl(min_items)) {}
-#else  // USE_TR1_UNORDERED_MAP
-    : cache_impl_(new CacheImpl()) {}
-#endif  // USE_TR1_UNORDERED_MAP
-
-RegExpCache::~RegExpCache() {
-  AutoLock l(lock_);
-  for (CacheImpl::const_iterator
-       it = cache_impl_->begin(); it != cache_impl_->end(); ++it) {
-    delete it->second;
-  }
-}
-
-const RegExp& RegExpCache::GetRegExp(const string& pattern) {
-  AutoLock l(lock_);
-  CacheImpl::const_iterator it = cache_impl_->find(pattern);
-  if (it != cache_impl_->end()) return *it->second;
-
-  const RegExp* regexp = RegExp::Create(pattern);
-  cache_impl_->insert(make_pair(pattern, regexp));
-  return *regexp;
-}
-
-}  // namespace phonenumbers
-}  // namespace i18n