deque::begin

發行項
03/27/2013

傳回定址 Iterator 指向 deque 的第一個項目。

const_iterator begin( ) const; 
iterator begin( );

傳回值

解決的隨機存取 Iterator 第一個項目是成功 deque 或空白 deque 的位置。

備註

如果 begin 的傳回值指派給 const_iterator，無法修改 deque 物件。如果 begin 的傳回值指派給 iterator，可以修改 deque 物件。

範例

// deque_begin.cpp
// compile with: /EHsc
#include <deque>
#include <iostream>

int main( ) 
{
   using namespace std;
   deque <int> c1;
   deque <int>::iterator c1_Iter;
   deque <int>::const_iterator c1_cIter;
   
   c1.push_back( 1 );
   c1.push_back( 2 );

   c1_Iter = c1.begin( );
   cout << "The first element of c1 is " << *c1_Iter << endl;

   *c1_Iter = 20;
   c1_Iter = c1.begin( );
   cout << "The first element of c1 is now " << *c1_Iter << endl;

   // The following line would be an error because iterator is const
   // *c1_cIter = 200;
}