C++/Map Multimap/map insert
Insert value pair to map
#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
*/
map insert
#include <map>
#include <iostream>
using namespace std;
class Data
{
public:
Data(int val = 0) { mVal = val; }
int getVal() const { return mVal; }
void setVal(int val) {mVal = val; }
protected:
int mVal;
};
int main(int argc, char** argv)
{
map<int, Data> dataMap;
pair<map<int, Data>::iterator, bool> ret;
ret = dataMap.insert(make_pair(1, Data(4)));
if (ret.second) {
cout << "Insert succeeded!\n";
} else {
cout << "Insert failed!\n";
}
ret = dataMap.insert(make_pair(1, Data(6)));
if (ret.second) {
cout << "Insert succeeded!\n";
} else {
cout << "Insert failed!\n";
}
return (0);
}