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Diffstat (limited to 'src/google/protobuf/stubs/singleton.h')
-rw-r--r-- | src/google/protobuf/stubs/singleton.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/google/protobuf/stubs/singleton.h b/src/google/protobuf/stubs/singleton.h new file mode 100644 index 00000000..e123e4fe --- /dev/null +++ b/src/google/protobuf/stubs/singleton.h @@ -0,0 +1,64 @@ +// Protocol Buffers - Google's data interchange format +// Copyright 2014 Google Inc. All rights reserved. +// https://developers.google.com/protocol-buffers/ +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +#ifndef GOOGLE_PROTOBUF_STUBS_SINGLETON_H__ +#define GOOGLE_PROTOBUF_STUBS_SINGLETON_H__ + +#include <google/protobuf/stubs/atomicops.h> +#include <google/protobuf/stubs/common.h> +#include <google/protobuf/stubs/once.h> + +namespace google { +namespace protobuf { +namespace internal { +template<typename T> +class Singleton { + public: + static T* get() { + GoogleOnceInit(&once_, &Singleton<T>::Init); + return instance_; + } + private: + static void Init() { + instance_ = new T(); + } + static ProtobufOnceType once_; + static T* instance_; +}; + +template<typename T> +ProtobufOnceType Singleton<T>::once_; + +template<typename T> +T* Singleton<T>::instance_; +} // namespace internal +} // namespace protobuf +} // namespace google + +#endif // GOOGLE_PROTOBUF_STUBS_SINGLETON_H__ |