...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
This is the example from the one minute tutorial section.
#include <string> #include <iostream> #include <boost/bimap.hpp> template< class MapType > void print_map(const MapType & map, const std::string & separator, std::ostream & os ) { typedef typename MapType::const_iterator const_iterator; for( const_iterator i = map.begin(), iend = map.end(); i != iend; ++i ) { os << i->first << separator << i->second << std::endl; } } int main() { // Soccer World cup typedef boost::bimap< std::string, int > results_bimap; typedef results_bimap::value_type position; results_bimap results; results.insert( position("Argentina" ,1) ); results.insert( position("Spain" ,2) ); results.insert( position("Germany" ,3) ); results.insert( position("France" ,4) ); std::cout << "The number of countries is " << results.size() << std::endl; std::cout << "The winner is " << results.right.at(1) << std::endl << std::endl; std::cout << "Countries names ordered by their final position:" << std::endl; // results.right works like a std::map< int, std::string > print_map( results.right, ") ", std::cout ); std::cout << std::endl << "Countries names ordered alphabetically along with" "their final position:" << std::endl; // results.left works like a std::map< std::string, int > print_map( results.left, " ends in position ", std::cout ); return 0; }
You can rewrite it using tags to gain readability.
#include <iostream> #include <boost/bimap.hpp> struct country {}; struct place {}; int main() { using namespace boost::bimaps; // Soccer World cup. typedef bimap < tagged< std::string, country >, tagged< int , place > > results_bimap; typedef results_bimap::value_type position; results_bimap results; results.insert( position("Argentina" ,1) ); results.insert( position("Spain" ,2) ); results.insert( position("Germany" ,3) ); results.insert( position("France" ,4) ); std::cout << "Countries names ordered by their final position:" << std::endl; for( results_bimap::map_by<place>::const_iterator i = results.by<place>().begin(), iend = results.by<place>().end() ; i != iend; ++i ) { std::cout << i->get<place >() << ") " << i->get<country>() << std::endl; } std::cout << std::endl << "Countries names ordered alfabetically along with" "their final position:" << std::endl; for( results_bimap::map_by<country>::const_iterator i = results.by<country>().begin(), iend = results.by<country>().end() ; i != iend; ++i ) { std::cout << i->get<country>() << " ends " << i->get<place >() << "º" << std::endl; } return 0; }
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