Insert value pair to map : map insert « map multimap « C++ Tutorial





#include <iostream>
using std::cout;
using std::endl;

#include <map> // map class-template definition

int main()
{
   std::map< int, double, std::less< int > > pairs;

   pairs.insert( std::map< int, double, std::less< int > >::value_type( 15, 2.7 ) );
   pairs.insert( std::map< int, double, std::less< int > >::value_type( 30, 111.11 ) );
   pairs.insert( std::map< int, double, std::less< int > >::value_type( 0, 1010.1 ) );
   pairs.insert( std::map< int, double, std::less< int > >::value_type( 10, 22.22 ) );
   pairs.insert( std::map< int, double, std::less< int > >::value_type( 25, 33.333 ) );
   pairs.insert( std::map< int, double, std::less< int > >::value_type( 0, 77.54 ) ); // dup ignored
   pairs.insert( std::map< int, double, std::less< int > >::value_type( 20, 9.345 ) );
   pairs.insert( std::map< int, double, std::less< int > >::value_type( 15, 99.3 ) ); // dup ignored

   cout << "pairs contains:\nKey\tValue\n";

   // use const_iterator to walk through elements of pairs
   for ( std::map< int, double, std::less< int > >::const_iterator iter = pairs.begin();
      iter != pairs.end(); ++iter )
      cout << iter->first << '\t' << iter->second << '\n';

   cout << endl;
   return 0;
}
pairs contains:
Key     Value
0       1010.1
10      22.22
15      2.7
20      9.345
25      33.333
30      111.11










23.6.map insert
23.6.1.Insert characters into map.
23.6.2.Use insert() to add an entry
23.6.3.Duplicate keys are not allowed in a map
23.6.4.Insert a pair using function make_pair
23.6.5.Insert a pair object directly
23.6.6.Insert using an array-like syntax for inserting key-value pairs
23.6.7.Insert key-value pairs into the map using value_type
23.6.8.use subscript operator to write value to a map
23.6.9.Insert value pair to map