#includeclass A{ public :   virtual float area()=0;      //定义纯虚函数};class rectangle : public A{ public :   rectangle(float x,float y)   {

//version 1.03#include#include#includeusing namespace std;void swap(int &a, int &b){ int temp = a; a = b; b =temp;}template T myMax(T a, T b){ return a >= b ? a : b;}//////////////

前一段时间写的c++虚函数的测试小程序

class hash_map{private: typedef hashtable,_Key,_HashFcn, _Select1st >,_EqualKey,_Alloc> _Ht; _Ht _M_ht; //可见hashmap内部的是使用hashtable实现的public: typedef typename _Ht::key_typ

#include#includeusing namespace std;using namespace std::placeholders;//函数int half(int x) {return x/2;}//仿函数struct third_t { int operator()(int x) {return x/3;}};//结构体struct MyValue {

#include #include #include using namespace std;struct C {int* data;};struct D {int a; int b;};int main(){ shared_ptr p1; shared_ptr p2(nullptr); shared_ptr p3(new int); shared_p

// shared_ptr::operator*#include #include #include using namespace std;int main () { int a[] = {1,2,3,4,5}; int b[] = {2,3,4,5,6}; int c[] = {3,4,5,6,7}; vector> vv; vv.reserve(10);

#include#include#include using namespace std;vector> func(){ vector> vv; int a[] = {1,2,3,4,5}; int b[] = {6,2,3,4,5}; int c[] = {5,2,2,4,5}; vv.push_back(vector(a, a+5));