类中函数指针

简单说明

1. 类中函数指针声明， e.g. using pFunc = void (ClassName::*)()；
2. 将函数指针保存到对应的容器中去 e.g. map[key] = &ClassName::funcName
3. 调用对应的函数 e.g. (this->*pFunc)()

示例

#ifndef PFUNCDEMO_H
#define PFUNCDEMO_H

#include <unordered_map>
#include <iostream>


namespace T16_NS {

using namespace std;

// 限定作用域的枚举
enum class OperType
{
    OPER_TYPE_1,
    OPER_TYPE_2,
};

class Hello
{
    // 声明函数指针别名, 注意需要 类名::
    using workFunc = void (Hello::*)();

public:
    Hello() {
        // 初始化函数指针
        m_workMap[OperType::OPER_TYPE_1] = &Hello::dowork1;
        m_workMap[OperType::OPER_TYPE_2] = &Hello::dowork2;
    }

public:
    void dowork(const OperType &key) {
        auto it = m_workMap.find(key);
        if (it == m_workMap.end())
        {
            return;
        }

        // 调用对应函数, 注意 需要this->*去调用
        (this->*(it->second))();
    }

private:
    void dowork1() { cout << "....dowork1....\n"; }
    void dowork2() { cout << "....dowork2....\n"; }

private:
    unordered_map<OperType, workFunc> m_workMap;
};


void test()
{
    Hello hello;
    hello.dowork(OperType::OPER_TYPE_2);
    hello.dowork(OperType::OPER_TYPE_1);
}

} // T16_NS