Qt/QtExamples
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

feat: add Observer Pattern

Browse Source
This commit is contained in:
XMuli 2022-12-24 01:17:47 +08:00
parent 492370ae45
commit ed401eda98
No known key found for this signature in database
GPG Key ID: 9554B5DD5B8E986A
13 changed files with 453 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
Studio/DesignPatterns/DesignPatterns.cpp Normal file
View File

@ -0,0 +1,9 @@
// DesignPatterns.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
//int main()
//{
// std::cout << "Hello World!\n";
//}

153
Studio/DesignPatterns/DesignPatterns.vcxproj Normal file
View File

@ -0,0 +1,153 @@
<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemGroup Label="ProjectConfigurations">
<ProjectConfiguration Include="Debug|Win32">
<Configuration>Debug</Configuration>
<Platform>Win32</Platform>
</ProjectConfiguration>
<ProjectConfiguration Include="Release|Win32">
<Configuration>Release</Configuration>
<Platform>Win32</Platform>
</ProjectConfiguration>
<ProjectConfiguration Include="Debug|x64">
<Configuration>Debug</Configuration>
<Platform>x64</Platform>
</ProjectConfiguration>
<ProjectConfiguration Include="Release|x64">
<Configuration>Release</Configuration>
<Platform>x64</Platform>
</ProjectConfiguration>
</ItemGroup>
<PropertyGroup Label="Globals">
<VCProjectVersion>16.0</VCProjectVersion>
<Keyword>Win32Proj</Keyword>
<ProjectGuid>{57f3c035-9c90-4e9f-934a-032804827444}</ProjectGuid>
<RootNamespace>DesignPatterns</RootNamespace>
<WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
</PropertyGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>true</UseDebugLibraries>
<PlatformToolset>v142</PlatformToolset>
<CharacterSet>Unicode</CharacterSet>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>false</UseDebugLibraries>
<PlatformToolset>v142</PlatformToolset>
<WholeProgramOptimization>true</WholeProgramOptimization>
<CharacterSet>Unicode</CharacterSet>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>true</UseDebugLibraries>
<PlatformToolset>v142</PlatformToolset>
<CharacterSet>Unicode</CharacterSet>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
<ConfigurationType>Application</ConfigurationType>
<UseDebugLibraries>false</UseDebugLibraries>
<PlatformToolset>v142</PlatformToolset>
<WholeProgramOptimization>true</WholeProgramOptimization>
<CharacterSet>Unicode</CharacterSet>
</PropertyGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
<ImportGroup Label="ExtensionSettings">
</ImportGroup>
<ImportGroup Label="Shared">
</ImportGroup>
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
</ImportGroup>
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
</ImportGroup>
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
</ImportGroup>
<ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
<Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
</ImportGroup>
<PropertyGroup Label="UserMacros" />
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<LinkIncremental>true</LinkIncremental>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<LinkIncremental>false</LinkIncremental>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<LinkIncremental>true</LinkIncremental>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
<LinkIncremental>false</LinkIncremental>
</PropertyGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
<ClCompile>
<WarningLevel>Level3</WarningLevel>
<SDLCheck>true</SDLCheck>
<PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ConformanceMode>true</ConformanceMode>
</ClCompile>
<Link>
<SubSystem>Console</SubSystem>
<GenerateDebugInformation>true</GenerateDebugInformation>
</Link>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
<ClCompile>
<WarningLevel>Level3</WarningLevel>
<FunctionLevelLinking>true</FunctionLevelLinking>
<IntrinsicFunctions>true</IntrinsicFunctions>
<SDLCheck>true</SDLCheck>
<PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ConformanceMode>true</ConformanceMode>
</ClCompile>
<Link>
<SubSystem>Console</SubSystem>
<EnableCOMDATFolding>true</EnableCOMDATFolding>
<OptimizeReferences>true</OptimizeReferences>
<GenerateDebugInformation>true</GenerateDebugInformation>
</Link>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
<ClCompile>
<WarningLevel>Level3</WarningLevel>
<SDLCheck>true</SDLCheck>
<PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ConformanceMode>true</ConformanceMode>
</ClCompile>
<Link>
<SubSystem>Console</SubSystem>
<GenerateDebugInformation>true</GenerateDebugInformation>
</Link>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
<ClCompile>
<WarningLevel>Level3</WarningLevel>
<FunctionLevelLinking>true</FunctionLevelLinking>
<IntrinsicFunctions>true</IntrinsicFunctions>
<SDLCheck>true</SDLCheck>
<PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<ConformanceMode>true</ConformanceMode>
</ClCompile>
<Link>
<SubSystem>Console</SubSystem>
<EnableCOMDATFolding>true</EnableCOMDATFolding>
<OptimizeReferences>true</OptimizeReferences>
<GenerateDebugInformation>true</GenerateDebugInformation>
</Link>
</ItemDefinitionGroup>
<ItemGroup>
<ClCompile Include="DesignPatterns.cpp" />
<ClCompile Include="Observer.cpp" />
<ClCompile Include="Singleton.cpp" />
</ItemGroup>
<ItemGroup>
<ClInclude Include="Observer.h" />
<ClInclude Include="Singleton.h" />
</ItemGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
<ImportGroup Label="ExtensionTargets">
</ImportGroup>
</Project>

36
Studio/DesignPatterns/DesignPatterns.vcxproj.filters Normal file
View File

@ -0,0 +1,36 @@
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemGroup>
<Filter Include="Source Files">
<UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
<Extensions>cpp;c;cc;cxx;c++;cppm;ixx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
</Filter>
<Filter Include="Header Files">
<UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
<Extensions>h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd</Extensions>
</Filter>
<Filter Include="Resource Files">
<UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
<Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
</Filter>
</ItemGroup>
<ItemGroup>
<ClCompile Include="DesignPatterns.cpp">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="Singleton.cpp">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="Observer.cpp">
<Filter>Source Files</Filter>
</ClCompile>
</ItemGroup>
<ItemGroup>
<ClInclude Include="Singleton.h">
<Filter>Header Files</Filter>
</ClInclude>
<ClInclude Include="Observer.h">
<Filter>Header Files</Filter>
</ClInclude>
</ItemGroup>
</Project>

1
Studio/DesignPatterns/Observer.cpp Normal file
View File

@ -0,0 +1 @@
#include "Observer.h"

106
Studio/DesignPatterns/Observer.h Normal file
View File

@ -0,0 +1,106 @@
/*******************************************************************
* Copyright (c) 2022~2023 XMuli All rights reserved.
* GitHub: https://github.com/XMuli
* Description: 观察者模式 Observer Pattern
* Reference: 情景 → Subject 发送一个消息，然后所有的 Observer A、B、C
* 都有收到，并且对相同的消息，做出各自不同的操作响应
* See: https://www.cnblogs.com/suzhou/p/dp16obsvr.html
******************************************************************/
#pragma once
#include <iostream>
#include <string>
#include <list>
using namespace std;
class Observer { // 观察者
public:
virtual void update(string msg) = 0;
virtual void doSomeThing() = 0;
protected:
string m_msg;
};
class Subject {
public:
Subject() = default;
virtual ~Subject() = default;
virtual void addObsvr(Observer* obj) = 0;
virtual void removeObsvr(Observer* obj) = 0;
virtual void notify(string msg) = 0;
};
//---------------------------------------------------------
class ConcreteSubject: public Subject {
public:
ConcreteSubject() {};
virtual ~ConcreteSubject() { m_obsvrs.clear(); }
virtual void addObsvr(Observer* obj) override {
m_obsvrs.push_back(obj);
}
virtual void removeObsvr(Observer* obj) override {
m_obsvrs.remove(obj);
}
virtual void notify(string msg) override {
for (const auto& it : m_obsvrs)
it->update(msg);
for (const auto& it : m_obsvrs)
it->doSomeThing();
cout << endl;
}
private:
list<Observer*> m_obsvrs;
};
class AObserver : public Observer {
public:
void update(string msg) override { m_msg = msg; }
virtual void doSomeThing() override { cout << "AObserver: 对 " << m_msg << " 进行 A 的操作" << endl; }
};
class BObserver : public Observer {
public:
void update(string msg) override { m_msg = msg; }
virtual void doSomeThing() override { cout << "BObserver: 对 " << m_msg << " 进行 B 的操作" << endl; }
};
class CObserver : public Observer {
public:
void update(string msg) override { m_msg = msg; }
virtual void doSomeThing() override { cout << "CObserver: 对 " << m_msg << " 进行 C 的操作" << endl; }
};
int main()
{
AObserver* a = new AObserver();
BObserver* b = new BObserver();
CObserver* c = new CObserver();
ConcreteSubject* concreSubject = new ConcreteSubject();
concreSubject->addObsvr(a);
concreSubject->addObsvr(b);
concreSubject->addObsvr(c);
concreSubject->notify("messagebox 1");
concreSubject->removeObsvr(c);
concreSubject->notify("messagebox 2");
//a->doSomeThing();
//b->doSomeThing();
//c->doSomeThing();
return 0;
}
/*****************************打印结果*******************************
AObserver: 对 messagebox 1 进行 A 的操作
BObserver: 对 messagebox 1 进行 B 的操作
CObserver: 对 messagebox 1 进行 C 的操作
AObserver: 对 messagebox 2 进行 A 的操作
BObserver: 对 messagebox 2 进行 B 的操作
******************************************************************/

1
Studio/DesignPatterns/Singleton.cpp Normal file
View File

@ -0,0 +1 @@
#include "Singleton.h"

24
Studio/DesignPatterns/Singleton.h Normal file
View File

@ -0,0 +1,24 @@
/*******************************************************************
* Copyright (c) 2022~2023 XMuli All rights reserved.
* GitHub: https://github.com/XMuli
* Description: 单例模式 Singleton Pattern 的最优雅实现
* Reference: https://zhuanlan.zhihu.com/p/37469260 单例介绍及好一篇
******************************************************************/
#pragma once
// 《Effective C++》提出了一种更优雅的单例模式实现，称为 Meyers' Singleton
class Singleton
{
public:
static Singleton& instance() {
static Singleton instan;
return instan;
}
private:
Singleton() {};
~Singleton() {};
Singleton(const Singleton& obj) = delete;
Singleton& operator=(const Singleton& obj) = delete;
};

10
Studio/Studio.sln
View File

@ -5,6 +5,8 @@ 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
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "DesignPatterns", "DesignPatterns\DesignPatterns.vcxproj", "{57F3C035-9C90-4E9F-934A-032804827444}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|x64 = Debug|x64
@ -21,6 +23,14 @@ Global
{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
{57F3C035-9C90-4E9F-934A-032804827444}.Debug|x64.ActiveCfg = Debug|x64
{57F3C035-9C90-4E9F-934A-032804827444}.Debug|x64.Build.0 = Debug|x64
{57F3C035-9C90-4E9F-934A-032804827444}.Debug|x86.ActiveCfg = Debug|Win32
{57F3C035-9C90-4E9F-934A-032804827444}.Debug|x86.Build.0 = Debug|Win32
{57F3C035-9C90-4E9F-934A-032804827444}.Release|x64.ActiveCfg = Release|x64
{57F3C035-9C90-4E9F-934A-032804827444}.Release|x64.Build.0 = Release|x64
{57F3C035-9C90-4E9F-934A-032804827444}.Release|x86.ActiveCfg = Release|Win32
{57F3C035-9C90-4E9F-934A-032804827444}.Release|x86.Build.0 = Release|Win32
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE

1
Studio/Studio/BinarySearch.cpp Normal file
View File

@ -0,0 +1 @@
#include "BinarySearch.h"

88
Studio/Studio/BinarySearch.h Normal file
View File

@ -0,0 +1,88 @@
#pragma once
#include <iostream>
#include <vector>
using namespace std;
int binarySearch(vector<int> vec, int target)
{
int left = 0;
int right = vec.size() - 1;
while (left <= right) {
int mid = left + (right - left) / 2;
if (target < vec[mid]) {
right = mid - 1;
} else if (target > vec[mid]) {
left = mid + 1;
} else {
return mid;
}
}
return -1;
}
int binarySearch2(vector<int> vec, int target)
{
int left = 0;
int right = vec.size();
while (left < right) {
int mid = left + (right - left) / 2;
if (target < vec[mid]) {
right = mid;
} else if (target > vec[mid]) {
left = mid + 1;
} else {
return mid;
}
}
return -1;
}
int binarySearch3(vector<int>& vec, int left, int right, int target)
{
if (left > right) // target 在数组左右两侧时的场景
return -1;
int mid = left + (right - left) / 2;
if (target < vec[mid]) {
return binarySearch3(vec, left, mid -1, target);
} else if (target > vec[mid]) {
return binarySearch3(vec, mid + 1, right, target);
} else {
return mid;
}
}
// 毒药版-错误百出版本
//int binarySearch4(vector<int> vec, int target)
//{
// int mid = vec.size() / 2;
//
// if (target < vec[mid]) {
// vector<int> t(vec.begin(), vec.begin() + mid);
// return binarySearch4(t, target);
// } else if (target > vec[mid]) {
// vector<int> t(vec.begin() + mid + 1, vec.end());
// return binarySearch4(t, target);
// } else {
// return mid;
// }
// return -1;
//}
int main()
{
vector<int> v = { 0, 3, 5, 6, 7 };
int target = 8;
cout << "binarySearch:" << binarySearch(v, target) << endl
<< "binarySearch2:" << binarySearch2(v, target) << endl
<< "binarySearch3:" << binarySearch3(v, 0, v.size() - 1, target) << endl;
return 0;
}

32
Studio/Studio/SpecialMembers.h
View File

@ -89,22 +89,22 @@ A fn() {
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;
}
//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;
//}
/*************************** 运行结果 *******************************
* no-default-val constructor

2
Studio/Studio/Studio.vcxproj
View File

@ -139,12 +139,14 @@
</Link>
</ItemDefinitionGroup>
<ItemGroup>
<ClCompile Include="BinarySearch.cpp" />
<ClCompile Include="SharedPtr.cpp" />
<ClCompile Include="SpecialMembers.cpp" />
<ClCompile Include="Studio.cpp" />
<ClCompile Include="UniquePtr.cpp" />
</ItemGroup>
<ItemGroup>
<ClInclude Include="BinarySearch.h" />
<ClInclude Include="MemoryAlignment.h" />
<ClInclude Include="SharedPtr.h" />
<ClInclude Include="SpecialMembers.h" />

6
Studio/Studio/Studio.vcxproj.filters
View File

@ -27,6 +27,9 @@
<ClCompile Include="SpecialMembers.cpp">
<Filter>Source Files</Filter>
</ClCompile>
<ClCompile Include="BinarySearch.cpp">
<Filter>Source Files</Filter>
</ClCompile>
</ItemGroup>
<ItemGroup>
<ClInclude Include="MemoryAlignment.h">
@ -41,5 +44,8 @@
<ClInclude Include="SpecialMembers.h">
<Filter>Header Files</Filter>
</ClInclude>
<ClInclude Include="BinarySearch.h">
<Filter>Header Files</Filter>
</ClInclude>
</ItemGroup>
</Project>