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void sort(); // sorts the elements of this list; // postcondition: this list is sorted; // invariant: size(); // complexity: O(n*log(n));
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EXAMPLE D.7 Sorting and Reversing a list Object
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#include <iostream> #include <list> using namespace std; typedef list<string> List; typedef List::iterator It; void print(List&); int main() { List l; l.push_back("Kenya"); l.push_back("Sudan"); l.push_back("Egypt"); l.push_back("Zaire"); l.push_back("Libya"); l.push_back("Congo"); l.push_back("Ghana"); print(l); l.sort(); print(l); l.reverse(); print(l); } void print(List& l) { cout << "\n"; for (It it=l.begin(); it != l.end(); it++) cout << *it << "\n"; } Kenya Sudan Egypt Zaire Libya Congo Ghana Congo Egypt Ghana Kenya Libya Sudan Zaire
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D.7 THE map CLASS TEMPLATE A map object (also called a dictionary, a table, or an associative array) acts like an array whose index can be any type that implements the < operator. A map is like a mathematical function that gives a unique y-value for each x-value. The x-value, called the key value, is the index. The y-value is the stored object that the key identifies. An English language dictionary is an example of a map object. The key value is the word and its associated object is the dictionary s definition of the word. Another standard example would be a database table of student records. The key value is the student identification number (e.g., Social Security number), and its associated object is the data record for that student. The map class template is defined in the <map> header. It has the same member functions as the vector class template. EXAMPLE D.8 Using a map Object
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#include <iostream> #include <map.h> using namespace std; struct Country { friend ostream& operator<<(ostream&, const Country&); Country(); Country(string, string, string, int, int); string abbr, capital, language; int population, area; }; typedef map<string,Country> Map; typedef Map::iterator It; typedef pair<const string,Country> Pair; void load(Map&); void print(Map&); void find(Map&, const string&); int main() { Map map; load(map); print(map); find(map,"Cuba"); find(map,"Iran"); find(map,"Oman"); }
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ostream& operator<<(ostream& ostr, const Country& c) { return ostr << c.abbr << ", " << c.capital << ", " << c.language << ", pop=" << c.population << ", area=" << c.area; } Country::Country() : abbr(""), capital(""), language(""), population(0), area(0) { } Country::Country(string ab, string c, string l, int p, int ar) : abbr(ab), capital(c), language(l), population(p), area(ar) { } void load(Map& m) { m["Iran"] = Country("IR","Tehran","Persian",68959931,632457); m["Iran"] = Country("IR","Tehran","Farsi",68959931,632457); m["Peru"] = Country("PE","Lima","Spanish",26111110,496223); m["Iraq"] = Country("IQ","Baghdad","Arabic",21722287,167975); m.insert(Pair("Togo",Country("TG","Lome","French",4905824,21927))); m.insert(Pair("Fiji",Country("FJ","Suva","English",802611,7054))); m.insert(Pair("Fiji",Country("FJ","Suva","Fijian",802611,7054))); } void print(Map& m) { for (It it=m.begin(); it != m.end(); it++) cout << it->first << ":\t" << it->second << "\n"; cout << "size=" << m.size() << "\n"; } void find(Map& m, const string& s) { cout << s; It it = m.find(s); if (it == m.end()) cout << " was not found.\n"; else cout << ":\t" << it->second << "\n"; } Fiji: FJ, Suva, English, pop=802611, area=7054 Iran: IR, Tehran, Farsi, pop=68959931, area=632457 Iraq: IQ, Baghdad, Arabic, pop=21722287, area=167975 Peru: PE, Lima, Spanish, pop=26111110, area=496223 Togo: TG, Lome, French, pop=4905824, area=21927 size=5 Cuba was not found. Iran: IR, Tehran, Farsi, pop=68959931, area=632457 Oman was not found. The program creates a map whose keys are four-letter names of countries and whose mapped values are Country objects, where Country is a class defined to have five fields: abbr, capital, language, population , and area. It uses a separate function to load the data into the map. The load() function illustrates two different ways to insert a pair element into a map. The first four lines use the subscript operator and the last three lines use the insert() function. The subscript operator works the same way on a map container as with other container classes: just like an array, except that with a map the index need not be an integer. In this example it is a string. The insert() function takes a single pair argument, where the two component types must be the same as for the map itself, except that the first component (the key field) must be const.
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