C++学习小结-2

*P2k_$J3j6U8|0class Base51Testing软件测试网1MQ%K&l'N B:} z:P4B.]
{51Testing软件测试网MZ\ `5yl%x
    public:51Testing软件测试网fo3`%B)F M\F1Hk
    Base(const char *s=NULL);51Testing软件测试网rr6O:t0U2s ]
    Base(const Base& rth);
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Sj2U0    Base & perator=(const Base & oth);
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i;?Z0    virtual ~Base();51Testing软件测试网WP4iau2WL0J|F
    private:51Testing软件测试网j`-SF+P6{ G2y4P
    char *m_data;51Testing软件测试网 Tp
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};
wl3zOH"S0Base::Base(const char* s)
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    if(s==NULL)51Testing软件测试网C\
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    {
w!^8G,b/M`FU0        m_data=new char[1];
1xb4XJ"^ L5v0        m_data[0]='\0';51Testing软件测试网!~[)VGw;G
    }51Testing软件测试网5_9S(A\.o2V-M
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    else
Mr"x/m0SLsZOi0    {51Testing软件测试网
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        int length=strlen(s);
2`5?:S.c2Oy0        m_data=new char[length+1];51Testing软件测试网U%\9UH
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        strcpy(m_data,s);51Testing软件测试网d5P*q)|6lS
    }
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"P s [ A.A3Ws1^0Base::Base(const Base & oth)
VZ(QqET$Qb`0{51Testing软件测试网B{I`*I
    int len=strlen(oth.m_data);
"P:q:?J)\6Y~*^0    m_data=new char[len+1];51Testing软件测试网D'us+P3FA u
    strcpy(m_data,oth.m_data);
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C*i0Base & Base::operator=(const Base & oth)
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    if(this==&oth) return *this;
[,~(}n0|0    delete []m_data;51Testing软件测试网l-{0W XDb
    int len=strlen(oth.m_data);
a9fe`u"WQ0    m_data=new char[len+1];
]1grXjVN#|]*o+F0    strcpy(m_data,oth.m_data);
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Q+WnGO0    return *this;51Testing软件测试网4X]@t8F+p8?
}51Testing软件测试网%E#mLP_,m#ydTj4h
Base::~Base()51Testing软件测试网9db ezmY
{51Testing软件测试网3yYY%wD@lT!W|B
    delete[] m_data;51Testing软件测试网sM-j`3p,\i4@
}51Testing软件测试网
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q#w o:Z2f3|OX0class Derived : public Base
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vT*WKHc0{
n:q&Z j9L#R.vo0    public:
1K*Bg+V2]2i0    Derived(const char* s=NULL,int a=0);
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@!jI;EL@0    Derived(const Derived& oth);51Testing软件测试网m6J%D4c W&P o:WG#Y*B2M
    Derived& perator=(const Derived& oth);
f+y8c)uf)n0    private:51Testing软件测试网/y"`.Ti
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    int m;51Testing软件测试网SLWZ}bVM
};
]^X#EH y0Derived::Derived(const char* s,int a):Base(s),m(a){ }51Testing软件测试网(vtg3oR!QW9]/[t:[
Derived::Derived(const Derived& oth):Base(oth),m(oth.m){ }51Testing软件测试网avi1~2z`Y2|
Derived& Derived::operator=(const Derived& oth)
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a!S``&E%ia0    if(this==&oth) return *this;
D{*W*ZU2OX0    Base::operator=(oth);51Testing软件测试网nI;k!g1M
    m=oth.m;
t3^!KD4yWo0    return *this;
]6L1jn!A9DKi0}51Testing软件测试网j'dw!k#a3?