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CHAP. 14]
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14.3 ASSIGNING VECTORS EXAMPLE 14.5 Using the Assignment Operator to Duplicate a vector
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This program demonstrates that one vector can be assigned to another. int main() { Strings v, w; load(v); w = v; sort(v.begin(),v.end()); print(v); print(w); }
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Chile Egypt Italy Japan Kenya Nepal Spain Zaire Japan Italy Spain Egypt Chile Zaire Nepal Kenya The assignment w = v has the same effect as the call load(w) would have: it duplicates each of the 8 elements of v and loads them into w. The fact that w is independent of v is evident from the output: w remains unchanged when v is sorted.
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EXAMPLE 14.6 Using the front(), back(), and pop_back() Functions
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The front() function returns the first element in the vector. The back() function returns the last element in the vector. The pop_back() function removes the last element in the vector. int main() { Strings v; load(v); sort(v.begin(),v.end()); print(v); cout << "v.front() = " << v.front() << endl; cout << "v.back() = " << v.back() << endl; v.pop_back(); cout << "v.back() = " << v.back() << endl; v.pop_back(); cout << "v.back() = " << v.back() << endl; print(v); }
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The call v.pop_back() removes the string Zaire from the vector v. Chile Egypt Italy Japan Kenya Nepal Spain Zaire
v.front() v.back() v.back() v.back() Chile Egypt Italy Japan Kenya Nepal = = = = Chile Zaire Spain Nepal
14.4 THE erase() and insert() FUNCTIONS EXAMPLE 14.7 Using the erase() Function
int main() { Strings v; load(v); sort(v.begin(),v.end()); print(v); v.erase(v.begin()+2); // removes Italy v.erase(v.end()-2); // removes Spain print(v); } Chile Egypt Italy Japan Kenya Nepal Spain Zaire Chile Egypt Japan Kenya Nepal Zaire The call v.erase(v.begin()+2) removes the element v[2]. It is the element that follows the 2nd element (Egypt) from the beginning of the vector. The call v.erase(v.begin()-2) removes the element v[n-2] , where n is the size of the vector. It is the element that follows the 2nd element (Nepal) from the end of the vector.
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CHAP. 14]
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EXAMPLE 14.8 Using the insert() Function
This program illustrates the insert() function and the use of the erase() function to remove an entire segment of elements. int main() { Strings v; load(v); sort(v.begin(),v.end()); print(v); v.erase(v.begin()+2,v.end()-2); // removes the segment Italy..Nepal print(v); v.insert(v.begin()+2,"India"); print(v); }
Chile Egypt Italy Japan Kenya Nepal Spain Zaire Chile Egypt Spain Zaire Chile Egypt India Spain Zaire The call v.erase(v.begin()+2,v.end()-2) removes the segment v[2..5]. The call v.insert(v.begin()+2,"India") inserts India immediately after the 2nd element (Egypt) from the beginning of the vector.
14.5 THE find() FUNCTION The find() function is used to search for an element in a vector. EXAMPLE 14.9 Using the find() Function
This program uses the find() function to obtain iterators that locate Egypt and Malta in the vector. Then it passes them to the sort() function to sort that segment within the vector. int main() { Strings v; load(v); print(v); Sit egypt=find(v.begin(),v.end(),"Egypt"); Sit malta=find(v.begin(),v.end(),"Malta");
STANDARD C++ VECTORS
[CHAP. 14
sort(egypt,malta); print(v); } void load(Strings& v) { v.push_back("Japan"); v.push_back("Italy"); v.push_back("Spain"); v.push_back("Egypt"); v.push_back("Chile"); v.push_back("Zaire"); v.push_back("Nepal"); v.push_back("Kenya"); v.push_back("India"); v.push_back("China"); v.push_back("Malta"); v.push_back("Syria"); } Japan Italy Spain Egypt Chile Zaire Nepal Kenya India China Malta Syria Japan Italy Spain Chile China Egypt India Kenya Nepal Zaire Malta Syria The two iterators egypt and malta are initialized by the find() function. Together, they delineate the segment v[3..9] consisting of the 7 elements { Egypt, Chile , Zaire, Nepal, Kenya, India, China}. The sort() function sorts that segment, leaving the other 5 elements unchanged. Like the sort() function, the find() function is a generic algorithm that requires two iterators to specify what segment of the vector is to be processed. (See page 373.) If you want to search the entire vector, use the iterators that are returned by the begin() and end() functions, like this: find(v.begin(), v.end(), x);
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CHAP. 14]
STANDARD C++ VECTORS
14.6 THE C++ STANDARD vector CLASS TEMPLATE The interface for the vector class template is the prototype for all the Standard C++ container class templates. (See 15.) With only a few exceptions, each member function of the vector class corresponds to an equivalent member function for each of the other container classes (stack, queue, list, set, map, etc.). Here is a simplified partial listing of the vector class template interface:
template <class T> class vector { friend bool operator==(const vector&, const vector&); friend bool operator<(const vector&, const vector&); public: typedef T* iterator; vector(); // default constructor vector(const vector&); // copy constructor vector(int, const T&); // auxiliary constructor vector(iterator, iterator); // auxiliary constructor ~vector(); // destructor vector& operator=(const vector&); // assignment operator void assign(int, const T&); // assigns a given value void assign(iterator, iterator); // copies elements from object void resize(int); // changes size of vector void swap(vector&); // swaps elements with object bool empty() const; // returns true iff empty int size() const; // return number of elements iterator begin(); // locates first element iterator end(); // locates dummy element at end T& operator[](int); // subscript operator T& at(int); // range-checked access T& front(); // accesses the first element T& back(); // accesses the last element void push_back(const T&); // inserts element at end void pop_back(); // removes last element iterator insert(iterator, const T&); void insert(iterator, int, const T&); void insert(iterator, iterator, iterator); iterator erase(iterator); iterator erase(iterator, iterator); void clear(); // removes all the elements private: //... };
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