C++ Tutorial/map multimap/multimap erase — различия между версиями
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Версия 14:21, 25 мая 2010
Erase an element given an iterator from the multimap
#include <map>
#include <iostream>
#include <string>
using namespace std;
typedef multimap <int, string> MULTIMAP_INT_STRING;
int main ()
{
MULTIMAP_INT_STRING mmapIntToString;
mmapIntToString.insert (MULTIMAP_INT_STRING::value_type (3, "Three"));
mmapIntToString.insert (MULTIMAP_INT_STRING::value_type(45, "Forty Five"));
// Erase an element given an iterator from the multimap
MULTIMAP_INT_STRING::iterator iElementLocator = mmapIntToString.find(45);
if (iElementLocator != mmapIntToString.end ())
{
mmapIntToString.erase (iElementLocator);
cout << "Erased a pair with 45 as key using an iterator" << endl;
}
MULTIMAP_INT_STRING::const_iterator iPairLocator;
// Print the contents of the multimap to the screen
for ( iPairLocator = mmapIntToString.begin ()
; iPairLocator != mmapIntToString.end ()
; ++ iPairLocator )
{
cout << "Key: " << iPairLocator->first;
cout << ", Value: " << iPairLocator->second.c_str () << endl;
}
return 0;
}Erase an element with key as -1 from the multimap
#include <map>
#include <iostream>
#include <string>
using namespace std;
typedef multimap <int, string> MULTIMAP_INT_STRING;
int main ()
{
MULTIMAP_INT_STRING mmapIntToString;
mmapIntToString.insert (MULTIMAP_INT_STRING::value_type (3, "Three"));
mmapIntToString.insert (MULTIMAP_INT_STRING::value_type(45, "Forty Five"));
// Eraseing an element with key as -1 from the multimap
if (mmapIntToString.erase (-1) > 0)
cout << "Erased all pairs with -1 as key." << endl;
MULTIMAP_INT_STRING::const_iterator iPairLocator;
// Print the contents of the multimap to the screen
for ( iPairLocator = mmapIntToString.begin ()
; iPairLocator != mmapIntToString.end ()
; ++ iPairLocator )
{
cout << "Key: " << iPairLocator->first;
cout << ", Value: " << iPairLocator->second.c_str () << endl;
}
return 0;
}Erase a range from the multimap
#include <map>
#include <iostream>
#include <string>
using namespace std;
typedef multimap <int, string> MULTIMAP_INT_STRING;
int main ()
{
MULTIMAP_INT_STRING mmapIntToString;
mmapIntToString.insert (MULTIMAP_INT_STRING::value_type (3, "Three"));
mmapIntToString.insert (MULTIMAP_INT_STRING::value_type(45, "Forty Five"));
// Erase a range from the multimap...
cout << "Erasing the range of pairs with 1000 as key." << endl;
mmapIntToString.erase ( mmapIntToString.lower_bound (1000)
, mmapIntToString.upper_bound (1000) );
cout << endl;
cout << "The multimap now contains " << mmapIntToString.size ();
cout << " key-value pair(s)." << "They are: " << endl;
MULTIMAP_INT_STRING::const_iterator iPairLocator;
// Print the contents of the multimap to the screen
for ( iPairLocator = mmapIntToString.begin ()
; iPairLocator != mmapIntToString.end ()
; ++ iPairLocator )
{
cout << "Key: " << iPairLocator->first;
cout << ", Value: " << iPairLocator->second.c_str () << endl;
}
return 0;
}