multimap.cpp

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#include <iostream>   // for cout, ostream
#include <map>        // for multimap
#include <string>     // for string
 
#include <examples.h>
 
 
typedef std::multimap<int, std::string, std::less<int>,
                      std::allocator<std::pair<const int, std::string> > >
months_type;
 
 
// Print out a multimap.
inline std::ostream&
operator<< (std::ostream &out, const months_type &m)
{
    for (months_type::const_iterator it = m.begin (); it != m.end (); ++it)
        std::cout << (*it).second << " has " << (*it).first << " days\n";
 
    return out;
}
 
 
int main ()
{
    // Create a multimap of months and the number of days in the month.
    months_type months;
 
    typedef months_type::value_type value_type;
 
    // Put the months in the multimap with the number of days
    // as the not necessarily unique key. 
    months.insert (value_type (31, std::string ("January")));
    months.insert (value_type (28, std::string ("Febuary")));
    months.insert (value_type (31, std::string ("March")));
    months.insert (value_type (30, std::string ("April")));
    months.insert (value_type (31, std::string ("May")));
    months.insert (value_type (30, std::string ("June")));
    months.insert (value_type (31, std::string ("July")));
    months.insert (value_type (31, std::string ("August")));
    months.insert (value_type (30, std::string ("September")));
    months.insert (value_type (31, std::string ("October")));
    months.insert (value_type (30, std::string ("November")));
    months.insert (value_type (31, std::string ("December")));
 
    // Print out the months.
    std::cout << "All months of the year\n" << months << std::endl;
 
    // Find all months with 30 days.
    std::pair<months_type::iterator, months_type::iterator> p = 
        months.equal_range (30);
 
    // Print out the 30 day months.
    std::cout << "\nMonths with 30 days\n";
 
    for ( ; p.first != p.second; ++p.first)
        std::cout << (*p.first).second << '\n';
 
    return 0;
}