в 14:21, 25 мая 2010

2010-05-25T14:21:17Z

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2010-05-25T10:28:51Z

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==Insert into multimap with key-value pair==

<source lang="cpp">#include <map>
#include <iostream>
using namespace std;
typedef map <int, string> MAP_INT_STRING;
typedef multimap <int, string> MMAP_INT_STRING;
int main ()
{
MMAP_INT_STRING mmapIntToString;
mmapIntToString.insert (MMAP_INT_STRING::value_type (3, "Three"));
mmapIntToString.insert (MMAP_INT_STRING::value_type (45, "Forty Five"));
cout << endl << "The multimap contains " << mmapIntToString.size ();
cout << " key-value pairs." << endl;
cout << "The elements in the multimap are: " << endl;

return 0;
}</source>

==Insert into multimap with make-pair function==

<source lang="cpp">#include <map>
#include <iostream>
using namespace std;
typedef map <int, string> MAP_INT_STRING;
typedef multimap <int, string> MMAP_INT_STRING;
int main ()
{
MMAP_INT_STRING mmapIntToString;
mmapIntToString.insert (make_pair (-1, "Minus One"));
cout << endl << "The multimap contains " << mmapIntToString.size ();
cout << " key-value pairs." << endl;
cout << "The elements in the multimap are: " << endl;

return 0;
}</source>

==Insert value pair to int, double multimap==

<source lang="cpp">#include <iostream>
using std::cout;
using std::endl;
#include <map>
int main()
{
std::multimap< int, double, std::less< int > > pairs; // declare the multimap pairs
cout << "There are currently " << pairs.count( 15 )
<< " pairs with key 15 in the multimap\n";
// insert two value_type objects in pairs
pairs.insert( std::multimap< int, double, std::less< int > >::value_type( 15, 2.7 ) );
pairs.insert( std::multimap< int, double, std::less< int > >::value_type( 15, 99.3 ) );
cout << "After inserts, there are " << pairs.count( 15 )
<< " pairs with key 15\n\n";
cout << endl;
return 0;
}</source>
<pre class=codeResult>There are currently 0 pairs with key 15 in the multimap
After inserts, there are 2 pairs with key 15</pre>

==uses a multimap to store names and phone numbers.==

<source lang="cpp">#include <iostream>
#include <map>
#include <string>
using namespace std;
void shownumbers(const char *n, multimap<string, string> mp);
int main()
{
multimap<string, string> phonemap;
// Insert elements by using operator[].
phonemap.insert(pair<string, string>("A", "B: 555-1111"));
phonemap.insert(pair<string, string>("C", "D: 555-1234"));
phonemap.insert(pair<string, string>("E", "F: 555-1122"));
phonemap.insert(pair<string, string>("J", "K: 314 555-2222"));
phonemap.insert(pair<string, string>("L", "M: 314 555-3322"));
phonemap.insert(pair<string, string>("O", "P: 666 555-9876"));
phonemap.insert(pair<string, string>("Q", "R: 555 555-1010"));
phonemap.insert(pair<string, string>("S", "T: 444 555-9999"));
shownumbers("A", phonemap);
shownumbers("C", phonemap);
shownumbers("E", phonemap);
int count = phonemap.erase("A");
cout << count << " elements have been removed.\n\n";
shownumbers("Ken", phonemap);
return 0;
}
// Show all numbers for a given name.
void shownumbers(const char *n, multimap<string, string> mmp) {
multimap<string, string>::iterator itr;
// Find the first matching key.
itr = mmp.find(n);
if(itr != mmp.end()) {
cout << "the numbers for " << n << ": " << endl;
do {
cout << " " << itr->second << endl;
++itr;
} while (itr != mmp.upper_bound(n));
}
else
cout << "No entry for " << n << " found." << endl;
}</source>

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в 14:21, 25 мая 2010

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