矢量vs字符串 [英] Vector vs string

问题描述

C ++ std :: vector和std :: basic_string之间的根本区别是什么？

What is the fundamental difference, if any, between a C++ std::vector and std::basic_string?

推荐答案

basic_string不会调用其元素的构造函数和析构函数。

• basic_string doesn't call constructors and destructors of its elements. vector does.

  swapping basic_string无效迭代器（启用小字符串优化），交换向量不。

  swapping basic_string invalidates iterators (enabling small string optimization), swapping vectors doesn't.

  basic_string内存不能在C ++ 03中连续分配。矢量总是连续的。在C ++ 0x [string.require]中删除此差异：

  basic_string memory may not be allocated continuously in C++03. vector is always continuous. This difference is removed in C++0x [string.require]:

  
  

  basic_string对象中的类char对象应连续存储

  The char-like objects in a basic_string object shall be stored contiguously




• basic_string有字符串操作接口。向量不能。

• basic_string has interface for string operations. vector doesn't.

  basic_string可以使用写入策略上的副本（在C ++ 11之前）。向量不能。

  basic_string may use copy on write strategy (in pre C++11). vector can't.

  非信徒的相关引文：

  [basic.string]：

  [basic.string]:

  
  

  类模板basic_string符合序列容器（23.2.3）的要求，对于
  可逆容器（23.2）和一个分配器感知容器（表99），除了basic_string
  不使用allocator_traits :: construct和allocator_traits :: construct和allocator_-
  构造或销毁它的元素traits :: destroy和那个交换（）为basic_string无效迭代器。由basic_string支持
  的迭代器是随机访问迭代器（24.2.7）。

  The class template basic_string conforms to the requirements for a Sequence Container (23.2.3), for a Reversible Container (23.2), and for an Allocator-aware container (Table 99), except that basic_string does not construct or destroy its elements using allocator_traits::construct and allocator_- traits::destroy and that swap() for basic_string invalidates iterators. The iterators supported by basic_string are random access iterators (24.2.7).

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