Austin Blackstone / Mbed 2 deprecated mbed-client-classic-example-lwip

mbed client on ethernet with LWIP

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of mbed-client-classic-example-lwip by sandbox

mbed-client/source/include/smartpointer.h@11:cada08fc8a70, 2016-06-09 (annotated)

Committer:
mbedAustin
Date:
Thu Jun 09 17:08:36 2016 +0000
Revision:
11:cada08fc8a70
Commit for public Consumption

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbedAustin 11:cada08fc8a70 1 /*
mbedAustin 11:cada08fc8a70 2 * Copyright (c) 2015 ARM Limited. All rights reserved.
mbedAustin 11:cada08fc8a70 3 * SPDX-License-Identifier: Apache-2.0
mbedAustin 11:cada08fc8a70 4 * Licensed under the Apache License, Version 2.0 (the License); you may
mbedAustin 11:cada08fc8a70 5 * not use this file except in compliance with the License.
mbedAustin 11:cada08fc8a70 6 * You may obtain a copy of the License at
mbedAustin 11:cada08fc8a70 7 *
mbedAustin 11:cada08fc8a70 8 * http://www.apache.org/licenses/LICENSE-2.0
mbedAustin 11:cada08fc8a70 9 *
mbedAustin 11:cada08fc8a70 10 * Unless required by applicable law or agreed to in writing, software
mbedAustin 11:cada08fc8a70 11 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
mbedAustin 11:cada08fc8a70 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbedAustin 11:cada08fc8a70 13 * See the License for the specific language governing permissions and
mbedAustin 11:cada08fc8a70 14 * limitations under the License.
mbedAustin 11:cada08fc8a70 15 */
mbedAustin 11:cada08fc8a70 16 #ifndef SMART_POINTER_H
mbedAustin 11:cada08fc8a70 17 #define SMART_POINTER_H
mbedAustin 11:cada08fc8a70 18
mbedAustin 11:cada08fc8a70 19 class ReferenceCount
mbedAustin 11:cada08fc8a70 20 {
mbedAustin 11:cada08fc8a70 21 private:
mbedAustin 11:cada08fc8a70 22
mbedAustin 11:cada08fc8a70 23 int _count; // Reference count
mbedAustin 11:cada08fc8a70 24
mbedAustin 11:cada08fc8a70 25 public:
mbedAustin 11:cada08fc8a70 26
mbedAustin 11:cada08fc8a70 27 void add_ref()
mbedAustin 11:cada08fc8a70 28 {
mbedAustin 11:cada08fc8a70 29 // Increment the reference count
mbedAustin 11:cada08fc8a70 30 _count++;
mbedAustin 11:cada08fc8a70 31 }
mbedAustin 11:cada08fc8a70 32
mbedAustin 11:cada08fc8a70 33 int release()
mbedAustin 11:cada08fc8a70 34 {
mbedAustin 11:cada08fc8a70 35 // Decrement the reference count and
mbedAustin 11:cada08fc8a70 36 // return the reference count.
mbedAustin 11:cada08fc8a70 37 return --_count;
mbedAustin 11:cada08fc8a70 38 }
mbedAustin 11:cada08fc8a70 39 };
mbedAustin 11:cada08fc8a70 40
mbedAustin 11:cada08fc8a70 41 template < typename T > class SmartPointer
mbedAustin 11:cada08fc8a70 42 {
mbedAustin 11:cada08fc8a70 43 private:
mbedAustin 11:cada08fc8a70 44
mbedAustin 11:cada08fc8a70 45 T *_data; // Generic pointer to be stored
mbedAustin 11:cada08fc8a70 46 ReferenceCount *_reference; // Reference count
mbedAustin 11:cada08fc8a70 47
mbedAustin 11:cada08fc8a70 48
mbedAustin 11:cada08fc8a70 49 public:
mbedAustin 11:cada08fc8a70 50
mbedAustin 11:cada08fc8a70 51 SmartPointer()
mbedAustin 11:cada08fc8a70 52 : _data(0), _reference(0)
mbedAustin 11:cada08fc8a70 53 {
mbedAustin 11:cada08fc8a70 54 // Create a new reference
mbedAustin 11:cada08fc8a70 55 _reference = new ReferenceCount();
mbedAustin 11:cada08fc8a70 56 // Increment the reference count
mbedAustin 11:cada08fc8a70 57 _reference->add_ref();
mbedAustin 11:cada08fc8a70 58 }
mbedAustin 11:cada08fc8a70 59
mbedAustin 11:cada08fc8a70 60 SmartPointer(T* value)
mbedAustin 11:cada08fc8a70 61 : _data(value), _reference(0)
mbedAustin 11:cada08fc8a70 62 {
mbedAustin 11:cada08fc8a70 63 // Create a new reference
mbedAustin 11:cada08fc8a70 64 _reference = new ReferenceCount();
mbedAustin 11:cada08fc8a70 65 // Increment the reference count
mbedAustin 11:cada08fc8a70 66 _reference->add_ref();
mbedAustin 11:cada08fc8a70 67 }
mbedAustin 11:cada08fc8a70 68
mbedAustin 11:cada08fc8a70 69 SmartPointer(const SmartPointer<T>& smart_pointer)
mbedAustin 11:cada08fc8a70 70 : _data(smart_pointer._data), reference(smart_pointer._reference)
mbedAustin 11:cada08fc8a70 71 {
mbedAustin 11:cada08fc8a70 72 // Copy constructor
mbedAustin 11:cada08fc8a70 73 // Copy the data and reference pointer
mbedAustin 11:cada08fc8a70 74 // and increment the reference count
mbedAustin 11:cada08fc8a70 75 _reference->add_ref();
mbedAustin 11:cada08fc8a70 76 }
mbedAustin 11:cada08fc8a70 77
mbedAustin 11:cada08fc8a70 78 ~SmartPointer()
mbedAustin 11:cada08fc8a70 79 {
mbedAustin 11:cada08fc8a70 80 if(_reference->release() == 0) {
mbedAustin 11:cada08fc8a70 81 delete _data;
mbedAustin 11:cada08fc8a70 82 delete _reference;
mbedAustin 11:cada08fc8a70 83 }
mbedAustin 11:cada08fc8a70 84 }
mbedAustin 11:cada08fc8a70 85
mbedAustin 11:cada08fc8a70 86 T& operator* ()
mbedAustin 11:cada08fc8a70 87 {
mbedAustin 11:cada08fc8a70 88 return *_data;
mbedAustin 11:cada08fc8a70 89 }
mbedAustin 11:cada08fc8a70 90
mbedAustin 11:cada08fc8a70 91 T* operator-> ()
mbedAustin 11:cada08fc8a70 92 {
mbedAustin 11:cada08fc8a70 93 return _data;
mbedAustin 11:cada08fc8a70 94 }
mbedAustin 11:cada08fc8a70 95
mbedAustin 11:cada08fc8a70 96 SmartPointer<T>& operator = (const SmartPointer<T>& smart_pointer)
mbedAustin 11:cada08fc8a70 97 {
mbedAustin 11:cada08fc8a70 98 // Assignment operator
mbedAustin 11:cada08fc8a70 99 if (this != &SmartPointer) { // Avoid self assignment
mbedAustin 11:cada08fc8a70 100 // Decrement the old reference count
mbedAustin 11:cada08fc8a70 101 // if reference become zero delete the old data
mbedAustin 11:cada08fc8a70 102 if(_reference->release() == 0) {
mbedAustin 11:cada08fc8a70 103 delete _data;
mbedAustin 11:cada08fc8a70 104 delete _reference;
mbedAustin 11:cada08fc8a70 105 }
mbedAustin 11:cada08fc8a70 106
mbedAustin 11:cada08fc8a70 107 // Copy the data and reference pointer
mbedAustin 11:cada08fc8a70 108 // and increment the reference count
mbedAustin 11:cada08fc8a70 109 _data = SmartPointer._data;
mbedAustin 11:cada08fc8a70 110 _reference = SmartPointer._reference;
mbedAustin 11:cada08fc8a70 111 _reference->add_ref();
mbedAustin 11:cada08fc8a70 112 }
mbedAustin 11:cada08fc8a70 113 return *this;
mbedAustin 11:cada08fc8a70 114 }
mbedAustin 11:cada08fc8a70 115
mbedAustin 11:cada08fc8a70 116 };
mbedAustin 11:cada08fc8a70 117
mbedAustin 11:cada08fc8a70 118 #endif // SMART_POINTER_H