boost::interprocess::string转换为char*

Question

是否可以将boost::interprocess::string转换为std::string或const char*？像c_str()这样的东西。

例如：

boost::interprocess::string is = "Hello world";
const char* ps = is.c_str();    // something similar
printf("%s", ps);

我甚至可以在非共享内存块中获得字符串的副本。

例如：

boost::interprocess::string is = "Hello world";
const char cs[100];
strcpy(cs, is.c_str());    // something similar
printf("%s", cs);

谢谢!

Answer 1

string有一个标准的c_str()方法。我找到了下面的here

//! <b>Returns</b>: Returns a pointer to a null-terminated array of characters 
//!   representing the string's contents. For any string s it is guaranteed 
//!   that the first s.size() characters in the array pointed to by s.c_str() 
//!   are equal to the character in s, and that s.c_str()[s.size()] is a null 
//!   character. Note, however, that it not necessarily the first null character. 
//!   Characters within a string are permitted to be null. 
const CharT* c_str() const 
{  return containers_detail::get_pointer(this->priv_addr()); }

(这是为basic_string准备的。string是一个模板实例化，其中CharT模板参数为char。)

此外，documentation here表示

basic_string是std::basic_string的实现，可以在共享内存等托管内存段中使用。它是使用类似向量的连续存储实现的，因此它具有快速的c字符串转换...