basic_string::rbegin

傳回 Iterator 至反向的字串的第一個項目。

const_reverse_iterator rbegin( ) const;
reverse_iterator rbegin( );

傳回值

傳回一個隨機存取 Iterator 至反向的字串的第一個項目，解決還沒有對應的 unreversed 字串的最後一個項目。

備註

無效 啟動 搭配字串，rbegin 搭配反向的字串。

如果 rbegin 的傳回值指派給 const_reverse_iterator，無法修改字串物件。 如果 rbegin 的傳回值指派給 reverse_iterator，可以修改字串物件。

rbegin 可用來逐一查看字串初始化向後反覆項目。

範例

// basic_string_rbegin.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.rbegin ( );
   // str1_rIter--;
   cout << "The first 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 = 'A';
   cout << "The first 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 = 'A';

   // For an empty string, begin is equivalent to end
   if ( str2.rbegin( ) == str2.rend ( ) )
      cout << "The string str2 is empty." << endl;
   else
      cout << "The stringstr2  is not empty." << endl;
}

需求

標題: <string>

命名空間: std

請參閱

參考

basic_string Class