又遇到问题了 一直在线 马上给分

[zyb_debug]

int *Values =new int [10];

Values[0]=0;
.......
Values[9]=9;

我现在要改便Values的大小
让Values有11个空间
Values[10]=10;
前面的数字不变
怎么实现

也就是我想知道vector 是怎么实现push_back的

[baihacker]

int* temp = new int[11];
memcpy(temp, Values, sizeof(int) * 10);
temp[10] = 10;
delete[] Values;
Values = temp;
temp = 0;

[独孤过儿]

vector会动态的管理它的大小，它有一个capacity()的成员函数，能显示出它当前可用的存储能力：

size_type capacity () const;  

Return size of allocated storage capacity

Returns the size of the allocated storage space for the elements of the vector container.

Notice that, in vectors, the capacity is not necessarily equal to the number of elements that conform the underlying vector content (this can be obtained with member vector::size), but the capacity of the actual allocated space, which is either equal or greater than the content size.

Notice also that this capacity does not suppose a limit to the size of the vector. If more space is required to accomodate new elements in the vector, the capacity is automatically expanded, or can even be explicitly modified by calling member vector::reserve.

The real limit on the size a vector object can reach is returned by member vector::max_size.


Parameters
none

Return Value
The size of the currently allocated storage capacity in the vector, measured in the number elements it could hold.
Member type size_type is an unsigned integral type.


Example
// comparing size, capacity and max_size
#include <iostream>
#include <vector>
using namespace std;

int main ()
{
  vector<int> myvector;

  // set some content in the vector:
  for (int i=0; i<100; i++) myvector.push_back(i);

  cout << "size: " << (int) myvector.size() << "\n";
  cout << "capacity: " << (int) myvector.capacity() << "\n";
  cout << "max_size: " << (int) myvector.max_size() << "\n";
  return 0;
}
 

A possible output for this program could be:
size: 100
capacity: 141
max_size: 1073741823 

[baihacker]

	void push_back(const _Ty& _Val)
		{	// insert element at end
		if (size() < capacity())

 #if _HAS_ITERATOR_DEBUGGING
			{ // room at end, construct it there
			_Orphan_range(_Mylast, _Mylast);
			_Mylast = _Ufill(_Mylast, 1, _Val);
			}

 #else /* _HAS_ITERATOR_DEBUGGING */
			_Mylast = _Ufill(_Mylast, 1, _Val);
 #endif /* _HAS_ITERATOR_DEBUGGING */

		else
			insert(end(), _Val);
		}

[zyb_debug]

强大 我怎么就像不到呢。！！！！！！！！！！！！！！！！！
太感谢了

[zyb_debug]

那个叫做过儿的 我怎么就给不了你分呢？？？？？？？？