c++ - "stringstream"是否复制构造它的字符串？

Question

在这样的一段代码中

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

s_stream 是否复制了 s？

我的意思是，如果在创建 s_stream 之后修改 s 会发生什么？

Answer 1

是的。来自 http://en.cppreference.com/w/cpp/io/basic_stringstream/basic_stringstream

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).