//常规中我们有很多办法以减少内存开销，但是每次对象的复制都是一次复制构造函数的执行
//效率和内存占用居高不下，经难度，本例或可作为一种思路
//只是本人首次尝试研究，初步构想，实践中是否可行还有待考证
//敬请广大网友批评指正
#include <iostream> using namespace std; class demo { public: demo(); demo(int a); demo(const demo& tmp); ~demo(); const demo& add(const demo & a, const demo& b); const demo * constoperator+(const demo & tmp); void set(int a); int get()const; private: int x; }; int main() { demo fta(5),ftb(6); const demo * const fts =fta + ftb; cout<< "ADD:"<< fts->get()<< endl; return 0; } demo::demo() { cout<< "Original constructorrunning...\t"; cout<< x <<endl; } demo::demo(int a) { x = a; cout<< "Set value constructorrunning...\n"; } demo::demo(const demo & tmp) { this->x =tmp.x; cout<< "Copy constructorrunning...\t"; cout<< x <<endl; } demo::~demo() { cout<< "Destructor running...\n"; } const demo & demo::add(const demo& a, const demo & b) { this->x =a.x + b.x; cout<< "Two objects...\n"; return *this; } const demo * const demo::operator+(const demo& tmp) { cout<< "Direct memory address accessmode, no objects will be copied.\n"; this->x =this->x + tmp.x; return this; } void demo::set(int a) { x = a; } int demo::get()const { return x; } |
