c++ 类初始化列表，构造函数，复制构造函数

川长思鸟来 2022-06-07 00:35 279阅读 0赞

//
    // Created by darren on 17-9-30.
    //
    #ifndef TEST_1_CLASS_TEST_H
    #define TEST_1_CLASS_TEST_H
    
    #include <iostream>
    #include <string.h>
    #include <stdlib.h>
    #include <assert.h>
    #include <errno.h>
    #include <stdio.h>
    using namespace std;
    class Human{
    public:
        Human(char *name, char* &gender, int lWeight);
        Human(Human &am);
        int eat();
        int run();
        void setAttribute(int age, int heighe);    //attribute
        inline void printf(){
            cout<<"height"<<height<<endl;
            cout<<"age:"<<age<<endl;
            cout<<"weight:"<<weight<<endl;
            cout<<"gender:"<<gender<<endl;
            cout<<"myName:"<<myName<<endl;
        }
        ~Human();
    
    private:
        int height;
        int age;
        char* myName;
        char* &gender;
        const int weight;
    public:
        static int iNumber;        //在类外对static类型的数据成员进行初始化
    };
    
    
    
    #endif //TEST_1_CLASS_TEST_H
    
     //
    // Created by darren on 17-9-30.
    //
    
    #include "1_class_test.h"
    
    using namespace std;
    
    int Human::iNumber =0;
    int Human::eat() {
        cout << "we eat the food" << endl;
        return 0;
    }
    
    int  Human::run() {
        cout << "we running" << endl;
    }
    
    void Human::setAttribute(int sAge, int sHeighe) {
    
        age = sAge;
        height = sHeighe;
    }
    
    Human::Human(char *name, char *&lGender, int lWeight = 0) : gender(lGender), weight(lWeight) {
    
        iNumber++;
        cout << "name:" << name << "lGender:" << lGender << "lWeight:" << lWeight << endl;
        cout << "new 构造函数被调用..." << endl;
        myName = new char[strlen(name) + 1];
        if (!myName) {
            perror("myNmae new failed");
            assert(0);
        }
        age = 18;
        height = 172;
        memcpy(myName, name, strlen(name));
        cout << "myName:" << myName << "gender:" << gender << "weight:" << weight << endl;
    
    }
    
    Human::Human(Human &am):gender(am.gender),weight(am.weight) {
    
        iNumber++;
        cout << "复制构造函数被调用" << endl;
        myName = new char[strlen(am.myName) + 1];
        if (!myName) {
            perror("myNmae new failed");
            assert(0);
        }
        memcpy(myName, am.myName, strlen(am.myName));
        cout << "my:" << myName << endl;
        age = am.age;
        height = am.height;
    }
    
    Human::~Human(){
    
        if (myName) {
            cout << "delete 析构函数被调用...%p" << myName << endl;
            delete myName;
        }
    
    }
    
    int main() {
    
        char gg[5] = "nan";
        char *gg1 = gg;
        Human man("tianxuhong", gg1, 110);
        Human human1 = man;
        man.printf();
        man.~Human();
        human1.printf();
    
        cout<<"object count:"<<Human::iNumber<<endl;
    
        return 0;
    }