basic_string::rend
Returns an iterator that addresses the location succeeding the last element in a reversed string.
const_reverse_iterator rend( ) const;
reverse_iterator rend( );
Return Value
A reverse random-access iterator that addresses the location succeeding the last element in a reversed string.
Remarks
rend is used with a reversed string just as end is used with a string.
If the return value of rend is assigned to a const_reverse_iterator, the string object cannot be modified. If the return value of rend is assigned to a reverse_iterator, the string object can be modified.
rend can be used to test whether a reverse iterator has reached the end of its string.
The value returned by rend should not be dereferenced.
Example
// basic_string_rend.cpp
// compile with: /EHsc
#include <string>
#include <iostream>
int main( )
{
using namespace std;
string str1 ("Able was I ere I saw Elba"), str2;
basic_string <char>::reverse_iterator str_rIter, str1_rIter, str2_rIter;
basic_string <char>::const_reverse_iterator str1_rcIter;
str1_rIter = str1.rend ( );
str1_rIter--;
cout << "The last character-letter of the reversed string str1 is: "
<< *str1_rIter << endl;
cout << "The full reversed string str1 is:\n ";
for ( str_rIter = str1.rbegin( ); str_rIter != str1.rend( ); str_rIter++ )
cout << *str_rIter;
cout << endl;
// The dereferenced iterator can be used to modify a character
*str1_rIter = 'o';
cout << "The last character-letter of the modified str1 is now: "
<< *str1_rIter << endl;
cout << "The full modified reversed string str1 is now:\n ";
for ( str_rIter = str1.rbegin( ); str_rIter != str1.rend( ); str_rIter++ )
cout << *str_rIter;
cout << endl;
// The following line would be an error because iterator is const
// *str1_rcIter = 'T';
// For an empty string, end is equivalent to begin
if ( str2.rbegin( ) == str2.rend ( ) )
cout << "The string str2 is empty." << endl;
else
cout << "The stringstr2 is not empty." << endl;
}
The last character-letter of the reversed string str1 is: A The full reversed string str1 is: ablE was I ere I saw elbA The last character-letter of the modified str1 is now: o The full modified reversed string str1 is now: ablE was I ere I saw elbo The string str2 is empty.
Requirements
Header: <string>
Namespace: std