使用C++11实现类似C#的属性概念设计

来源：互联网发布：程序员的发展趋势编辑：程序博客网时间：2024/06/10 09:29

原文地址在这：http://www.cnblogs.com/feng-sc/p/5742689.html

实现挺有意思的，看懂了代码也可以加深对C++知识的理解，是不错的小技巧，记录下来。

#include<functional>#define property_setter(variableType) [&](variableType value)#define property_getter(variableType) [&]()->variableTypetemplate <typename ValueType>class property_rw{public:typedef std::function<void(ValueType value)> Setter;typedef std::function<ValueType(void)> Getter;explicit property_rw(Setter setter, Getter getter) : m_setter(setter), m_getter(getter) {}property_rw& operator=(ValueType value){this->value = value;m_setter(this->value);return *this;}property_rw& operator=(const property_rw & instance){this->value = instance.m_getter();m_setter(this->value);return *this;}operator ValueType(){return m_getter();}private:ValueType value;Setter m_setter;Getter m_getter;};template <typename ValueType>class property_r{public:typedef std::function<void(ValueType value)> Setter;typedef std::function< ValueType (void)> Getter;explicit property_r(Getter getter) : m_getter(getter) {}operator ValueType(){return m_getter();}private:ValueType value;Getter m_getter;};template <typename ValueType>class property_w{public:typedef std::function <void(ValueType value)> Setter;explicit property_w(Setter setter) : m_setter(setter) {}property_w& operator=(ValueType value){this->value = value;m_setter(this->value);return *this;}property_w& operator=(const property_w & instance){this->value = instance.m_getter();m_setter(this->value);return *this;}private:ValueType value;Setter m_setter;};

#include <iostream>#include <string>#include "test.h"using namespace std;class TestDemo{public:property_rw<string> Name = property_rw<string>(property_setter(std::string){m_rw_name = value;},property_getter(std::string){return m_rw_name;});property_r<string> ReadOnlyName = property_r<string>(property_getter(std::string){return m_readonly_name;});property_w<string> WriteOnlyName = property_w<string>(property_setter(std::string){m_writeonly_name = value;TestWork();});void TestWork(){std::cout <<"TestWork()::m_writeonly_name--" << std::endl;}private:std::string m_rw_name;std::string m_readonly_name = "I m read only name";std::string m_writeonly_name = "";};int _tmain(int argc, _TCHAR* argv[]){TestDemo test;test.Name = "This is test name!";std::string str = test.Name;std::string readonly = test.ReadOnlyName;std::cout<< "Test read and write,Name:" <<str<< std::endl;std::cout<< "Test readonly, msg:"<< readonly << std::endl;test.WriteOnlyName = "This is write only property!";//test.ReadOnlyName = "This is write only property!";//std::string  s = test.WriteOnlyName;return 0;}

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