std::vector::get_allocator

allocator_type get_allocator() const noexcept;

Returns a copy of the allocator object associated with the vector.
返回vector的内存分配器。

Parameters

none

Return Value

The allocator.
返回值是一个内存分配器对象。
Member type allocator_type is the type of the allocator used by the container, defined in vector as an alias of its second template parameter
(Alloc).

Example

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// vector::get_allocator
#include <iostream>
#include <vector>

int main ()
{
  std::vector<int> myvector;
  int * p;
  unsigned int i;

  // allocate an array with space for 5 elements using vector's allocator:
  p = myvector.get_allocator().allocate(5);

  // construct values in-place on the array:
  for (i=0; i<5; i++) myvector.get_allocator().construct(&p[i],i);

  std::cout << "The allocated array contains:";
  for (i=0; i<5; i++) std::cout << ' ' << p[i];
  std::cout << '\n';

  // destroy and deallocate:
  for (i=0; i<5; i++) myvector.get_allocator().destroy(&p[i]);
  myvector.get_allocator().deallocate(p,5);

  return 0;
}

The example shows an elaborate way to allocate memory for an array of ints using the same allocator used by the vector. Output:

The allocated array contains: 0 1 2 3 4

这个例子详细说明了array分配内存的过程。

Complexity

Constant.

Iterator validity

No changes.

Data races

The container is accessed.容器将被访问。
No contained elements are accessed: concurrently accessing or modifying them is safe.
容器内的元素不会被访问。同时访问以及修改他们都是安全的。

Exception safety

No-throw guarantee: this member function never throws exceptions.该方法不会i抛出异常。
Copying any instantiation of the default allocator is also guaranteed to never throw.复制任何实例化的默认构造器也不会抛出异常。

//翻译的不好的地方请多多指导，可以在下面留言或者点击左上方邮件地址给我发邮件，指出我的错误以及不足，以便我修改，更好的分享给大家，谢谢。

转载请注明出处：http://blog.csdn.net/qq844352155

2014-8-17

于GDUT