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# hash_multimap::rbegin

Visual Studio 2015

## 語法

```
const_reverse_iterator rbegin( ) const;
reverse_iterator rbegin( );
```

## 備註

rbegin 可用來將 hash_multimap 向後逐一查看。

## 範例

```// hash_multimap_rbegin.cpp
// compile with: /EHsc
#include <hash_map>
#include <iostream>

int main( )
{
using namespace std;
using namespace stdext;
hash_multimap <int, int> hm1;

hash_multimap <int, int> :: iterator hm1_Iter;
hash_multimap <int, int> :: reverse_iterator hm1_rIter;
hash_multimap <int, int> :: const_reverse_iterator hm1_crIter;
typedef pair <int, int> Int_Pair;

hm1.insert ( Int_Pair ( 1, 10 ) );
hm1.insert ( Int_Pair ( 2, 20 ) );
hm1.insert ( Int_Pair ( 3, 30 ) );

hm1_rIter = hm1.rbegin( );
cout << "The first element of the reversed hash_multimap hm1 is "
<< hm1_rIter -> first << "." << endl;

// begin can be used to start an iteration
// through a hash_multimap in a forward order
cout << "The hash_multimap is: ";
for ( hm1_Iter = hm1.begin( ) ; hm1_Iter != hm1.end( ); hm1_Iter++)
cout << hm1_Iter -> first << " ";
cout << "." << endl;

// rbegin can be used to start an iteration
// through a hash_multimap in a reverse order
cout << "The reversed hash_multimap is: ";
for ( hm1_rIter = hm1.rbegin( ) ; hm1_rIter != hm1.rend( ); hm1_rIter++)
cout << hm1_rIter -> first << " ";
cout << "." << endl;

// A hash_multimap element can be erased by dereferencing its key
hm1_rIter = hm1.rbegin( );
hm1.erase ( hm1_rIter -> first );

hm1_rIter = hm1.rbegin( );
cout << "After the erasure, the first element"
<< "\n in the reversed hash_multimap is "
<< hm1_rIter -> first << "." << endl;
}
```
```          反轉 hash_multimap hm1 的第一個元素為 3。
hash_multimap 如下:1 2 3。

在相反的 hash_multimap 為 2。
```