feat: C++ implementation of unique_ptr
This commit is contained in:
XMuli
@@ -92,26 +92,55 @@ private: //
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mutex* _pMutex; // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD>Ӳ<EFBFBD><D3B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>߳<EFBFBD>
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};
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int main()
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{
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SharedPtr<int> sp1(new int(10));
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SharedPtr<int> sp2(sp1);
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*sp2 = 20;
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//sp1 <20><> sp2 <20>ڹ<EFBFBD><DAB9><EFBFBD><EFBFBD>ⲿ<EFBFBD><E2B2BF><EFBFBD><EFBFBD>Դ<EFBFBD><D4B4><EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><C3BC><EFBFBD>Ϊ 2
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cout << sp1.useCount() << " *ptr:" << *sp1 << endl; //2 20
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cout << sp2.useCount() << " *ptr:" << *sp2 << endl; //2 20
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SharedPtr<int> sp3(new int(30));
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sp2 = sp3; //sp3 <20><>ֵ<EFBFBD><D6B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷŹ<CDB7><C5B9><EFBFBD><EFBFBD>ľ<EFBFBD><C4BE><EFBFBD>Դ<EFBFBD><D4B4><EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><C3BC><EFBFBD>-1<><31>
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cout << sp1.useCount() << " *ptr:" << *sp1 << endl; //1 20
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cout << sp2.useCount() << " *ptr:" << *sp2 << endl; //2 30
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cout << sp3.useCount() << " *ptr:" << *sp3 << endl; //2 30
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sp1 = sp3;
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cout << sp1.useCount() << " *ptr:" << *sp1 << endl; //3 30
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cout << sp2.useCount() << " *ptr:" << *sp2 << endl; //3 30
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cout << sp3.useCount() << " *ptr:" << *sp3 << endl; //3 30
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//int main()
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//{
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// SharedPtr<int> sp1(new int(10));
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// SharedPtr<int> sp2(sp1);
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// *sp2 = 20;
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// //sp1 <20><> sp2 <20>ڹ<EFBFBD><DAB9><EFBFBD><EFBFBD>ⲿ<EFBFBD><E2B2BF><EFBFBD><EFBFBD>Դ<EFBFBD><D4B4><EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><C3BC><EFBFBD>Ϊ 2
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// cout << sp1.useCount() << " *ptr:" << *sp1 << endl; //2 20
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// cout << sp2.useCount() << " *ptr:" << *sp2 << endl; //2 20
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//
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// SharedPtr<int> sp3(new int(30));
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// sp2 = sp3; //sp3 <20><>ֵ<EFBFBD><D6B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷŹ<CDB7><C5B9><EFBFBD><EFBFBD>ľ<EFBFBD><C4BE><EFBFBD>Դ<EFBFBD><D4B4><EFBFBD><EFBFBD><EFBFBD>ü<EFBFBD><C3BC><EFBFBD>-1<><31>
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// cout << sp1.useCount() << " *ptr:" << *sp1 << endl; //1 20
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// cout << sp2.useCount() << " *ptr:" << *sp2 << endl; //2 30
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// cout << sp3.useCount() << " *ptr:" << *sp3 << endl; //2 30
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//
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// sp1 = sp3;
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// cout << sp1.useCount() << " *ptr:" << *sp1 << endl; //3 30
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// cout << sp2.useCount() << " *ptr:" << *sp2 << endl; //3 30
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// cout << sp3.useCount() << " *ptr:" << *sp3 << endl; //3 30
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//
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// std::cout << "Hello World!\n";
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// return 0;
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//}
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std::cout << "Hello World!\n";
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return 0;
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}
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/*******************************************************************
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* <20><>ӡ<EFBFBD><D3A1><EFBFBD><EFBFBD>:
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* no default constructor
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* copy constructor
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* addRefCount
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* 2 *ptr:20
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* 2 *ptr:20
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* no default constructor
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* copy assignment constructor
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* release
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* addRefCount
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* 1 *ptr:20
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* 2 *ptr:30
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* 2 *ptr:30
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* copy assignment constructor
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* release
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* addRefCount
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* 3 *ptr:30
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* 3 *ptr:30
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* 3 *ptr:30
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* Hello World!
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* destructor
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* release
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* destructor
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* release
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* destructor
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* release
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******************************************************************/
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@@ -6,15 +6,4 @@
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//int main()
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//{
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// std::cout << "Hello World!\n";
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//}
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// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
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// Debug program: F5 or Debug > Start Debugging menu
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// Tips for Getting Started:
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// 1. Use the Solution Explorer window to add/manage files
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// 2. Use the Team Explorer window to connect to source control
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// 3. Use the Output window to see build output and other messages
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// 4. Use the Error List window to view errors
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// 5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
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// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file
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//}
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@@ -141,11 +141,13 @@
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<ItemGroup>
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<ClCompile Include="SharedPtr.cpp" />
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<ClCompile Include="Studio.cpp" />
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<ClCompile Include="UniquePtr.cpp" />
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</ItemGroup>
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<ItemGroup>
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<ClInclude Include="MemoryAlignment.h" />
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<ClInclude Include="SharedPtr.h" />
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<ClInclude Include="SpecialMembers.h" />
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<ClInclude Include="UniquePtr.h" />
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</ItemGroup>
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<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
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<ImportGroup Label="ExtensionTargets">
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@@ -21,6 +21,9 @@
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<ClCompile Include="SharedPtr.cpp">
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<Filter>Source Files</Filter>
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</ClCompile>
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<ClCompile Include="UniquePtr.cpp">
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<Filter>Source Files</Filter>
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</ClCompile>
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</ItemGroup>
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<ItemGroup>
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<ClInclude Include="MemoryAlignment.h">
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@@ -32,5 +35,8 @@
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<ClInclude Include="SharedPtr.h">
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<Filter>Header Files</Filter>
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</ClInclude>
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<ClInclude Include="UniquePtr.h">
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<Filter>Header Files</Filter>
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</ClInclude>
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</ItemGroup>
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</Project>
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1
Studio/Studio/UniquePtr.cpp
Normal file
1
Studio/Studio/UniquePtr.cpp
Normal file
@@ -0,0 +1 @@
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#include "UniquePtr.h"
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125
Studio/Studio/UniquePtr.h
Normal file
125
Studio/Studio/UniquePtr.h
Normal file
@@ -0,0 +1,125 @@
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/*******************************************************************
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* Copyright (c) 2022~2023 XMuli All rights reserved.
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* GitHub: https://github.com/XMuli
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* Description: C++ ʵ<><CAB5>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD>ĵ<EFBFBD> unique_ptr <20><><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8>ģ<EFBFBD><C4A3><EFBFBD>ࣻ
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* Ref: https://www.jianshu.com/p/77c2988be336
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* https://juejin.cn/post/7122641980315680782
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* https://juejin.cn/post/7099967913594978341
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******************************************************************/
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#pragma once
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#include <iostream>
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using namespace std;
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template <typename T>
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class UniquePtr
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{
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public:
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constexpr UniquePtr() : _ptr(nullptr) { cout << "default constructor" << endl; };
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explicit UniquePtr(T* obj) : _ptr(obj) { cout << "no default constructor" << endl; };
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UniquePtr(UniquePtr<T>&& obj) noexcept
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: _ptr(obj._ptr)
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{
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cout << "move constructor" << endl;
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obj._ptr = nullptr;
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}
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UniquePtr<T>& operator=(UniquePtr<T>&& obj) noexcept
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{
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cout << "move assignment constructor" << endl;
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if (&obj != this) {
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if (obj._ptr) {
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_ptr = obj._ptr;
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obj._ptr = nullptr;
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}
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}
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return *this;
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}
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UniquePtr(const UniquePtr<T>& obj) = delete; // C++11 delete <20><>ֹ<EFBFBD><D6B9>ʽ<EFBFBD><CABD>C++98 <20><> private <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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UniquePtr<T>& operator=(const UniquePtr<T>& obj) = delete;
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~UniquePtr()
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{
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cout << "destructor" << endl;
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if (_ptr) {
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delete _ptr;
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_ptr = nullptr;
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}
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}
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T& operator*() const { return *_ptr; }
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T* operator->() const { return _ptr; }
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T* get() const { return _ptr; }
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T* release() // return std::exchange(_ptr, nullptr); // C++14
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{
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T* temp = _ptr;
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_ptr = nullptr;
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return temp;
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}
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void reset(T* ptr) // std::exchange(_ptr, ptr); // C++14
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{
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_ptr = ptr;
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}
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void swap(UniquePtr<T>& obj)
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{
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std::swap(_ptr, obj._ptr);
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}
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private:
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T* _ptr;
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};
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//int main()
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//{
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// UniquePtr<int> up1(new int(10));
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// cout << "up1:" << up1.get() << " *ptr:" << *up1 << endl;
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// UniquePtr<int> up2(std::move(up1)); // <20><><EFBFBD><EFBFBD>Ȩ<EFBFBD><C8A8><EFBFBD><EFBFBD>
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// cout << "up1:" << up1.get() << endl; // nullptr, <20><>ʱ up1 <20><><EFBFBD><EFBFBD><DEBF><EFBFBD>Ȩ
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// cout << "up2:" << up2.get() << " *ptr:" << *up2 << endl;
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//
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// UniquePtr<int> up3(new int(30));
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// UniquePtr<int> up4(new int(40));
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// cout << "up3:" << up3.get() << " *ptr:" << *up3 << endl;
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// cout << "up4:" << up4.get() << " *ptr:" << *up4 << endl;
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// up3 = std::move(up2); // <20><><EFBFBD><EFBFBD>Ȩ<EFBFBD><C8A8><EFBFBD><EFBFBD>
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// cout << "up3:" << up3.get() << " *ptr:" << *up3 << endl;
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// cout << "up4:" << up4.get() << " *ptr:" << *up4 << endl;
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// up3.swap(up4);
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// cout << "up3:" << up3.get() << " *ptr:" << *up3 << endl;
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// cout << "up4:" << up4.get() << " *ptr:" << *up4 << endl;
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//
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// up3.release();
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// cout << "up3:" << up3.get() << endl;
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//
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// std::cout << "Hello World!\n";
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// return 0;
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//}
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/*******************************************************************
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* <20><>ӡ<EFBFBD><D3A1><EFBFBD><EFBFBD>:
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* no default constructor
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* up1:01355E78 *ptr:10
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* move constructor
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* up1:00000000
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* up2:01355E78 *ptr:10
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* no default constructor
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* no default constructor
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* up3:01355AF0 *ptr:30
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* up4:01355B20 *ptr:40
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* move assignment constructor
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* up3:01355E78 *ptr:10
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* up4:01355B20 *ptr:40
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* up3:01355B20 *ptr:40
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* up4:01355E78 *ptr:10
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* up3:00000000
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* Hello World!
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* destructor
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* destructor
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* destructor
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* destructor
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******************************************************************/
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