在像这样的一段代码中

std::string s("random;string;");
std::stringstream s_stream(s);

s_stream会复制s吗？

我的意思是,如果在创建s_stream之后修改了s,会发生什么？

解决方法:

是.从http://en.cppreference.com/w/cpp/io/basic_stringstream/basic_stringstream起

2) Uses a copy of str as initial contents of the underlying string device. The underlying basic_stringbuf object is constructed as basic_stringbuf<Char,Traits,Allocator>(str, mode).