请教一下各位朋友,把对象按引用传递,也会调用拷贝构造函数吗?下面是一个例子,问题用注释标了出来,
请大家指点一下.谢谢!

//tabtenn.h--包含了基类和派生类的声明

#ifndef TABTENN_H_
#define TABTENN_H_
#include <iostream>
using namespace std;
class TableTennisPlayer
{
private:
    enum{LIM=20};
    char firstName[LIM];
    char lastName[LIM];
    bool hasTable;
public:
    TableTennisPlayer(const char *fn="noName",
                      const char *ln="noName",
                      bool ht=false);
    /*
    TableTennisPlayer(TableTennisPlayer &ttp)
    {
        cout << "TableTennisPlayer copy constructor called!\n";
        
    }
    */ // 添加自定义的拷贝构造函数，则编译出错！这是为什么？
    TableTennisPlayer(TableTennisPlayer &ttp);

    void ShowName()const;
    bool HasTable()const
    {
        return hasTable;
    }
    void ResetTable(bool v)
    {
        hasTable=v;
    }

};

class RatedPlayer:public TableTennisPlayer
{
private:
    unsigned int rating;
public:
    RatedPlayer(unsigned int r=0, const char *fn="noName",
                const char *ln="noName", bool ht=false);
    RatedPlayer(unsigned int r, const TableTennisPlayer &tp);
    unsigned int Rating()
    {
        return rating;
    }
    void ResetRating(unsigned int r)
    {
        rating=r;
    }
};

#endif


//tabtenn.cpp--基类与派生类成员函数的实现

#include "tabtenn.h"
#include <iostream>
#include <cstring>
using namespace std;


TableTennisPlayer::TableTennisPlayer(const char *fn,const char *ln, bool ht)
{
    strncpy(firstName, fn, LIM-1);
    firstName[LIM-1]='\0';
    strncpy(lastName, ln, LIM-1);
    lastName[LIM-1]='\0';
    hasTable=ht;
}

void TableTennisPlayer::ShowName()const
{
    cout << lastName << "," << firstName << endl;
}

RatedPlayer::RatedPlayer(unsigned int r,const TableTennisPlayer &tp):TableTennisPlayer(tp),
                                                                     rating(r)
//这里的对象是按引用传递，并不是按值传递，那为什么还会调用拷贝构造函数？{

}

RatedPlayer::RatedPlayer(unsigned int r, const char *fn, const char *ln, bool ht):TableTennisPlayer(fn,ln,ht)
{
    rating=r;
}

//usetabtenn.cpp -- 主函数,,使用上述代码.

#include "tabtenn.h"
#include <iostream>
using namespace std;

int main(void)
{
    

    TableTennisPlayer player_1("Tara", "Boomdea", false);
    RatedPlayer rplayer_1(1104, "Mallory", "Duck", true);

    rplayer_1.ShowName();
    if(rplayer_1.HasTable())
        cout << "has a table.\n";
    else cout << "don't have a table.\n";
         player_1.ShowName();
    if(player_1.HasTable())
        cout << "has a table.\n";
    else cout << "don't have a table.\n";

    rplayer_1.ShowName();
    cout << " 's rating : " << rplayer_1.Rating() << endl;

    RatedPlayer rplayer_2(1212, player_1);
    cout << "Name:";
    rplayer_2.ShowName();
    cout << "  's rating : " << rplayer_2.Rating() << endl;




    return 0;
}

C++ 在哪些情况下会生成临时对象呀?

只给声明，没给定义..