c++ - std::string 在 C++11 中是否总是以空值结尾？

Question

Herb Sutter 在 2008 年在他的网站上发表的一篇文章中指出:

There is an active proposal to tighten this up further in C++0x and require null-termination and possibly ban copy-on-write implementations, for concurrency-related reasons. Here’s the paper: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2534.html . I think that one or both of the proposals in this paper is likely to be adopted, but we’ll see at the next meeting or two.

我知道 C++11 现在保证 std::string 内容连续存储，但他们在最终草案中采用了上述内容吗？

现在使用 &str[0] 之类的东西安全吗？

Answer 1

是的。根据 C++0x FDIS 21.4.7.1/1，std::basic_string::c_str() 必须返回

a pointer p such that p + i == &operator[](i) for each i in [0,size()].

这意味着给定一个字符串s，s.c_str()返回的指针必须和字符串中起始字符的地址相同(&s[0]).