C++中的三大函数和操作符重载(Boolan)

#include

#include

classfoo_t {

 friendstd::ostream &operator<<(std::ostream &os, foo_tconst&foo) {

  os << foo.data;

  returnos;

 }

 public:

 foo_t(void) : data(newchar[14]) { std::strcpy(data,"Hello, World!"); }

 ~foo_t(void) {delete[] data; }

 foo_t(constfoo_t& other);

 foo_t &operator=(constfoo_t& other);

 private:

 char*data;

};

foo_t::foo_t(constfoo_t& other) {

 std::cout <<"call copy constructor!!!"<< std::endl;

 this->data =newchar[strlen(other.data) + 1];

 strcpy(this->data, other.data);

}

foo_t& foo_t::operator=(constfoo_t& other) {

 std::cout <<"call the copy assignment operator!!!"<< std::endl;

 if(this== &other)

   return*this;

 this->data =newchar[strlen(other.data) + 1];

 strcpy(this->data, other.data);

 return*this;

}

intmain() {

 foo_t foo;

 std::cout << foo <<'\n';

 foo_t t(foo);

 // foo_t t2 = t;

 foo_t t3;

 t3 = t;

 return0;

}