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mbed client lightswitch demo
Dependencies: mbed Socket lwip-eth lwip-sys lwip
Fork of mbed-client-classic-example-lwip by
Diff: mbed-client/source/include/smartpointer.h
- Revision:
- 11:cada08fc8a70
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-client/source/include/smartpointer.h Thu Jun 09 17:08:36 2016 +0000 @@ -0,0 +1,118 @@ +/* + * Copyright (c) 2015 ARM Limited. All rights reserved. + * SPDX-License-Identifier: Apache-2.0 + * 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. + */ +#ifndef SMART_POINTER_H +#define SMART_POINTER_H + +class ReferenceCount +{ +private: + + int _count; // Reference count + +public: + +void add_ref() +{ + // Increment the reference count + _count++; +} + +int release() +{ + // Decrement the reference count and + // return the reference count. + return --_count; +} +}; + +template < typename T > class SmartPointer +{ +private: + + T *_data; // Generic pointer to be stored + ReferenceCount *_reference; // Reference count + + +public: + +SmartPointer() +: _data(0), _reference(0) +{ + // Create a new reference + _reference = new ReferenceCount(); + // Increment the reference count + _reference->add_ref(); +} + +SmartPointer(T* value) +: _data(value), _reference(0) +{ + // Create a new reference + _reference = new ReferenceCount(); + // Increment the reference count + _reference->add_ref(); +} + +SmartPointer(const SmartPointer<T>& smart_pointer) +: _data(smart_pointer._data), reference(smart_pointer._reference) +{ + // Copy constructor + // Copy the data and reference pointer + // and increment the reference count + _reference->add_ref(); +} + +~SmartPointer() +{ + if(_reference->release() == 0) { + delete _data; + delete _reference; + } +} + +T& operator* () +{ + return *_data; +} + +T* operator-> () +{ + return _data; +} + +SmartPointer<T>& operator = (const SmartPointer<T>& smart_pointer) +{ + // Assignment operator + if (this != &SmartPointer) { // Avoid self assignment + // Decrement the old reference count + // if reference become zero delete the old data + if(_reference->release() == 0) { + delete _data; + delete _reference; + } + + // Copy the data and reference pointer + // and increment the reference count + _data = SmartPointer._data; + _reference = SmartPointer._reference; + _reference->add_ref(); + } + return *this; +} + +}; + +#endif // SMART_POINTER_H