feat: CPlusPlus Studio

2022-12-17 19:48:56 +08:00 · 2022-12-17 19:48:56 +08:00 · fa8e6f3c8b
commit fa8e6f3c8b
parent 07d3684eed
8 changed files with 503 additions and 0 deletions
--- a/Studio/Studio.sln
+++ b/Studio/Studio.sln
@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.32802.440
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Studio", "Studio\Studio.vcxproj", "{11117C51-BEAF-4F63-B386-CDB0760BCDE8}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{11117C51-BEAF-4F63-B386-CDB0760BCDE8}.Debug|x64.ActiveCfg = Debug|x64
+		{11117C51-BEAF-4F63-B386-CDB0760BCDE8}.Debug|x64.Build.0 = Debug|x64
+		{11117C51-BEAF-4F63-B386-CDB0760BCDE8}.Debug|x86.ActiveCfg = Debug|Win32
+		{11117C51-BEAF-4F63-B386-CDB0760BCDE8}.Debug|x86.Build.0 = Debug|Win32
+		{11117C51-BEAF-4F63-B386-CDB0760BCDE8}.Release|x64.ActiveCfg = Release|x64
+		{11117C51-BEAF-4F63-B386-CDB0760BCDE8}.Release|x64.Build.0 = Release|x64
+		{11117C51-BEAF-4F63-B386-CDB0760BCDE8}.Release|x86.ActiveCfg = Release|Win32
+		{11117C51-BEAF-4F63-B386-CDB0760BCDE8}.Release|x86.Build.0 = Release|Win32
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {BBED567D-5B88-44EF-BE70-53896DD79856}
+	EndGlobalSection
+EndGlobal
--- a/Studio/Studio/MemoryAlignment.h
+++ b/Studio/Studio/MemoryAlignment.h
@ -0,0 +1,37 @@
+/*******************************************************************
+ * Copyright (c) 2022~2023 XMuli  All rights reserved.
+ * GitHub: https://github.com/XMuli
+ * Description: ÀàÖÐ×Ö½Ú¶ÔÆëÅÐ¶Ï
+ ******************************************************************/
+
+// NOTE: 
+#pragma once
+class A
+{
+private:
+    int m_a;
+    char m_c1;
+    char m_c2;
+
+    static int g_sta;
+};  // 8
+
+class B
+{
+public:
+    void fun() {};
+
+private:
+    char m_c1;
+    int m_a;
+    char m_c2;
+}; // 12
+
+class C
+{
+public:
+    virtual void fun() {};
+
+private:
+    int m_a;
+}; // 8
--- a/Studio/Studio/SharedPtr.cpp
+++ b/Studio/Studio/SharedPtr.cpp
@ -0,0 +1 @@
+#include "SharedPtr.h"
--- a/Studio/Studio/SharedPtr.h
+++ b/Studio/Studio/SharedPtr.h
@ -0,0 +1,117 @@
+/*******************************************************************
+ * Copyright (c) 2022~2023 XMuli  All rights reserved.
+ * GitHub: https://github.com/XMuli
+ * Description: C++ 实现一个核心的 shared_ptr 智能指针模板类；实现了引用计数是线程安全的，但访问管理的资源不是线程安全的。
+ * Note: 书写测试时，若使用默认构造函数, 成员变量 _ptr、_refCount、_pMutex 在 release() 中容易崩溃；推荐带参的构造函数，无错
+ * Ref: https://juejin.cn/post/7111726931301072910#heading-8
+ *      https://cloud.tencent.com/developer/article/1688444
+ *      https://blog.csdn.net/Z_Stand/article/details/98512756
+ ******************************************************************/
+
+#pragma once
+#include <iostream>
+#include <mutex>
+using namespace std;
+
+template <typename T>
+class SharedPtr
+{
+public:
+    SharedPtr() : _ptr(nullptr), _refCount(nullptr), _pMutex(nullptr) { cout << "default constructor" << endl; };
+    SharedPtr(T* obj) : _ptr(obj), _refCount(new int(1)), _pMutex(new mutex) { cout << "no default constructor" << endl; };
+
+    SharedPtr(const SharedPtr<T>& obj)  // 其 _refCount 可以通过另外一个指针来修改，指向的是同一个地址
+        : _ptr(obj._ptr)
+        , _refCount(obj._refCount)
+        , _pMutex(obj._pMutex)
+    {
+        cout << "copy constructor" << endl;
+        addRefCount();
+    };
+
+    SharedPtr<T>& operator=(const SharedPtr<T>& obj)
+    {
+        cout << "copy assignment constructor" << endl;
+        if (&obj != this) {
+            if (_ptr != obj._ptr) {
+                release();            // 先释放旧的资源
+
+                _ptr = obj._ptr;
+                _refCount = obj._refCount;
+                _pMutex = obj._pMutex;
+
+                addRefCount();        // 再技计数 +1
+            }
+        }
+
+        return *this;
+    }
+
+    //SharedPtr(SharedPtr<T>&& obj) noexcept;
+    //SharedPtr<T>& operator=(SharedPtr<T>&& obj)noexcept;
+
+    ~SharedPtr() { cout << "destructor" << endl; release(); }
+    T& operator*() { return *_ptr; }
+    T* operator->() { return _ptr; }
+
+    int useCount() { return *_refCount; }
+    T* get() { return _ptr; }
+
+private:
+    void addRefCount()
+    {
+        cout << "addRefCount" << endl;
+        _pMutex->lock();
+        ++*_refCount;
+        _pMutex->unlock();
+    }
+
+    void release()
+    {
+        cout << "release" << endl;
+        bool bDelMutex = false;
+        _pMutex->lock();
+
+        if (_ptr && --*_refCount == 0) {  // 先校验是否存在，及计数为 0 才释放
+            delete _ptr;
+            delete _refCount;
+            _ptr = nullptr;
+            _refCount = nullptr;
+
+            bDelMutex = true;
+        }
+
+        _pMutex->unlock();
+        if (bDelMutex)
+            delete _pMutex;
+    }
+
+private:                  // 需在构造函数中初始化
+    T* _ptr;
+    int* _refCount;
+    mutex* _pMutex;       // 计数自增非原子操作，加锁解决多线程
+};
+
+int main()
+{
+    SharedPtr<int> sp1(new int(10));
+    SharedPtr<int> sp2(sp1);
+    *sp2 = 20;
+                                                                //sp1 与 sp2 在管理这部分资源，引用计数为 2
+    cout << sp1.useCount() << "  *ptr:" << *sp1 << endl;		//2	 20
+    cout << sp2.useCount() << "  *ptr:" << *sp2 << endl;		//2	 20
+                                                                  
+    SharedPtr<int> sp3(new int(30));                              
+    sp2 = sp3;		                                            //sp3 赋值给它，释放管理的旧资源，引用计数-1，   
+    cout << sp1.useCount() << "  *ptr:" << *sp1 << endl;        //1	 20
+    cout << sp2.useCount() << "  *ptr:" << *sp2 << endl;        //2	 30
+    cout << sp3.useCount() << "  *ptr:" << *sp3 << endl;        //2	 30
+                                                                  
+    sp1 = sp3;                                                    
+    cout << sp1.useCount() << "  *ptr:" << *sp1 << endl;        //3	 30
+    cout << sp2.useCount() << "  *ptr:" << *sp2 << endl;        //3	 30
+    cout << sp3.useCount() << "  *ptr:" << *sp3 << endl;        //3	 30
+
+    std::cout << "Hello World!\n";
+    return 0;
+}
--- a/Studio/Studio/SpecialMembers.h
+++ b/Studio/Studio/SpecialMembers.h
@ -0,0 +1,108 @@
+/*******************************************************************
+ * Copyright (c) 2022~2023 XMuli  All rights reserved.
+ * GitHub: https://github.com/XMuli
+ * Description: C++ 类的特殊五个函数
+ * Ref：https://en.cppreference.com/w/cpp/language/rule_of_three  https://en.wikipedia.org/wiki/Special_member_functions
+ ******************************************************************/
+
+#pragma once
+#include <iostream>
+#include <utility>
+using namespace std;
+
+class A
+{
+public:
+    A() : m_ptr(nullptr) {
+        std::cout << "default constructor" << endl;
+    }
+
+    A(const char* s) : m_ptr(nullptr) {
+        std::cout << "no-default-val constructor" << endl;
+        if (s) {
+            auto n = std::strlen(s) + 1;
+            m_ptr = new char[n];
+            std::memcpy(m_ptr, s, n);
+        }
+    }
+
+    A(const A& other)
+        : m_ptr(nullptr) {
+        std::cout << "copy constructor" << endl;
+        if (other.m_ptr) {
+            auto n = std::strlen(other.m_ptr) + 1;
+            m_ptr = new char[n];
+            std::memcpy(m_ptr, other.m_ptr, n);
+        }
+    }
+
+    A& operator = (const A& other) {
+        std::cout << "copy assignment constructor" << endl;
+        if (this != &other) {
+            delete[] m_ptr;  // Free the existing resource.
+
+            if (other.m_ptr != nullptr) {
+                auto n = std::strlen(other.m_ptr) + 1;
+                m_ptr = new char[n];
+                std::memcpy(m_ptr, other.m_ptr, n);
+            }
+        }
+
+        return *this;
+    }
+
+    A(A&& other) noexcept    // 行参无 const
+        : m_ptr(nullptr) {
+        std::cout << "move constructor" << endl;
+        if (other.m_ptr)
+            m_ptr = std::move(other.m_ptr);
+
+        other.m_ptr = nullptr;
+    }
+
+    A& operator=(A&& other) noexcept {  // 行参无 const
+        std::cout << "move assignment constructor" << endl;
+        if (this != &other) {
+            delete[] m_ptr;  // Free the existing resource.
+
+            if (other.m_ptr)
+                m_ptr = std::move(other.m_ptr);
+
+            other.m_ptr = nullptr;
+        }
+
+        return *this;
+    }
+
+    ~A() {
+        std::cout << "destructor" << endl;
+        if (m_ptr)
+            delete[] m_ptr;
+    }
+
+private:
+    char* m_ptr;
+};
+
+A fn() {
+    A t("A fun()");
+    return t;
+}
+
+//int main()
+//{
+//    A a1("a1");                // default constructor
+//    A a2(a1);                  // copy constructor
+//    A a3 = a1;                 // copy constructor
+//    a1 = a3;                   // copy assignment constructor
+//
+//    std::cout << "----------------------------\n\n";
+//
+//    //fn();                    // function returning a A object
+//    A a5 = std::move(a1);      // move constructor
+//    A a6;                      // default constructor
+//    a6 = std::move(a1);        // move assignment constructor
+//    std::cout << "Hello World!\n";
+//
+//    return 0;
+//}
--- a/Studio/Studio/Studio.cpp
+++ b/Studio/Studio/Studio.cpp
@ -0,0 +1,20 @@
+// Studio.cpp : This file contains the 'main' function. Program execution begins and ends there.
+//
+
+#include <iostream>
+
+//int main()
+//{
+//    std::cout << "Hello World!\n";
+//}
+
+// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
+// Debug program: F5 or Debug > Start Debugging menu
+
+// Tips for Getting Started: 
+//   1. Use the Solution Explorer window to add/manage files
+//   2. Use the Team Explorer window to connect to source control
+//   3. Use the Output window to see build output and other messages
+//   4. Use the Error List window to view errors
+//   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
+//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file
--- a/Studio/Studio/Studio.vcxproj
+++ b/Studio/Studio/Studio.vcxproj
@ -0,0 +1,153 @@
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+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
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+    <RootNamespace>Studio</RootNamespace>
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+    <ClInclude Include="SharedPtr.h" />
+    <ClInclude Include="SpecialMembers.h" />
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--- a/Studio/Studio/Studio.vcxproj.filters
+++ b/Studio/Studio/Studio.vcxproj.filters
@ -0,0 +1,36 @@
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