intx = (p.*pMemberFunc)(); intz = (p.*pVirtualMemberFunc)(); ++z; } 我们使用gdb看一下这个成员函数指针的size: (gdb) p sizeof(MemberFunction_t) $1= 16 在赋值之后,查看pMemberFunc和pVirtualMemberFunc的二进制是什么: (gdb)x/2ag&pMemberFunc
classB{virtualvoiddo_f();// private memberpublic:voidf(){do_f();}// public interface};structD:publicB{voiddo_f()override;// overrides B::do_f};intmain(){D d;B*bp=&d;bp->f();// internally calls D::do_f();} For every virtual function, there is thefinal overrider, which...
virtualintpub_fun(){returnpub_a;} private: intpri_a; protected: intpro_a; }; intmain(){ Base a; a.pub_fun(); ... } 上面是打断点到a进行声明的地方和a进行声明后的信息,前后查看a的信息,可以发现,a中包括虚指针在内的成员都会进行默认的初始化,而a的int成员因为它类型特性,初始化是随意的,...
// test.h #include <iostream> using std::cout; class Base{ int a; void fun_a(){a=1;} public: void fun_b(); virtual void fun_c(); }; //test.cpp #include "test.h" void Base::fun_b(){ cout << "aaa\n"; } void Base::fun_c(){ cout << "virtual.\n"; } 重新make...
籍由NVI: Non-virtual Interface 完成 Templates Method 模式 籍由Function Pointers 实现 Strategy 模式 籍由std::function 完成 Strategy 模式: std::fucntion 可封装函数指针、函数对象、成员函数指针(借助bind)、lambda 37. 绝不重新定义继承而来的缺省参数值 因为缺省参数值都是静态绑定,而 virtual 函数——你唯一...
The table is filled in "order of declaration"; that is, if there is no base class with virtual functions, the first declared member function in the derived class (source code order) corresponds to the first entry in the virtual function table for this class. If there are virtual functions...
A non-pure virtual member function can be defined as deleted, even though it is implicitly odr-used. A deleted function can only be overridden by deleted functions, and a non-deleted function can only be overridden by non-deleted functions. If string-literal is present, the implementation is...
member function static member function virtual function(not pure) virtual and overload function functor private member function(use addr_pri.h) private member function(cpp17) Description of the unit test Cannot stub Can't stub the exit function, the compiler has made special optimizations. ...
call son virtual function 再把子类的print函数注释掉,再次执行,结果如下: call CPtr constructors call CSon constructors call virtual function 也就是说,对于子类而言,在构造函数中调用虚函数也是调用的它自身的函数,而当子类没有实现的时候才调用父类的虚函数,这一幕是不是很熟悉,实际上就是发生了多态的效果...
选项影响套接字操作，如 封包路由，OOB数据传输，获取和设置套接字选项分别是 getsockopt setsockopt ...