数据结构ssd5 exercise2

#include"Listing.h" //Adds the Advertisement pointer given by the parameter to the vector objects void Listing::add(Advertisement* ptr) { this->objects.push_back(ptr); } //This returns an iterator to the first Advertisement* in vector objects Listing::iterator Listing::begin() { return this->objects.begin(); } //This returns an iterator to the last Advertisement* in vector objects Listing::iterator Listing::end() { return this->objects.end(); } //This returns the Advertisement pointer whose number equals the parameter number Advertisement* Listing::operator[](const int& number) { for(int i = 0; i <= objects.size(); i++) { if(number == objects[i]->getNumber()) { return objects[i]; } } return NULL; }