15.x 纯虚函数是否可以定义

ccccC++Primer

• Author：李英民 | Henry
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#include <iostream>
#include <string>
#include <vector>
#include <iterator>
#include <algorithm>
#include <typeinfo>
#include <numeric>
#include <memory>
#include <initializer_list>
using namespace std; 
//win+<-/-> 切换窗口位置
//ctrl+win+<-/->切换桌面 
//ctrl+alt+上/下 改变显示器方向 
class Test
{
    public:
    virtual int func() {cout<<"Test"<<endl;} 
};
class Test1:public Test
{
    public:
        virtual int func()=0;
};
inline 
int Test1::func()
{
    cout<<"Test1"<<endl;
}
class Test2:public Test1
{
    public:
        virtual int func() override;
};
inline int Test2::func()
{
    cout<<"Test2"<<endl;
    Test::func();
    Test1::func();
}
int main()  
{
    Test2 t2;
    Test *p = &t2;
    p->func();
    return 0;  
}  

如果不定义，调用了将会发生系统级编译错误！
一般不要随意定义和调用纯虚函数，纯虚函数调用是没有意义的！