/usr/include/phonenumbers/base/memory/singleton.h is in libphonenumber6-dev 6.3~svn698-3+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | // Copyright (C) 2011 The Libphonenumber Authors
//
// 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: Philippe Liard
#ifndef I18N_PHONENUMBERS_BASE_MEMORY_SINGLETON_H_
#define I18N_PHONENUMBERS_BASE_MEMORY_SINGLETON_H_
#if defined(I18N_PHONENUMBERS_USE_BOOST)
#include <boost/scoped_ptr.hpp>
#include <boost/thread/once.hpp>
#include <boost/utility.hpp>
namespace i18n {
namespace phonenumbers {
template <class T>
class Singleton : private boost::noncopyable {
public:
virtual ~Singleton() {}
static T* GetInstance() {
boost::call_once(Init, flag);
return instance.get();
}
private:
static void Init() {
instance.reset(new T());
}
static boost::scoped_ptr<T> instance;
static boost::once_flag flag;
};
template <class T> boost::scoped_ptr<T> Singleton<T>::instance;
template <class T> boost::once_flag Singleton<T>::flag = BOOST_ONCE_INIT;
} // namespace phonenumbers
} // namespace i18n
#else // !I18N_PHONENUMBERS_USE_BOOST
#include "phonenumbers/base/logging.h"
#include "phonenumbers/base/thread_checker.h"
#if !defined(__linux__) && !defined(__APPLE__)
namespace i18n {
namespace phonenumbers {
// Note that this implementation is not thread-safe. For a thread-safe
// implementation on non-POSIX platforms, please compile with
// -DI18N_PHONENUMBERS_USE_BOOST.
template <class T>
class Singleton {
public:
Singleton() : thread_checker_() {}
virtual ~Singleton() {}
static T* GetInstance() {
static T* instance = NULL;
if (!instance) {
instance = new T();
}
DCHECK(instance->thread_checker_.CalledOnValidThread());
return instance;
}
private:
const ThreadChecker thread_checker_;
};
} // namespace phonenumbers
} // namespace i18n
#else
#include "phonenumbers/base/memory/singleton_posix.h"
#endif // !defined(__linux__) && !defined(__APPLE__)
#endif // !I18N_PHONENUMBERS_USE_BOOST
#endif // I18N_PHONENUMBERS_BASE_MEMORY_SINGLETON_H_
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