c++ - std::ostringstream 的字符串的默认值？

Question

我想知道 std::ostringstream 是否总是用空字符串初始化。

std::ostringstream ss;

bool isEmpty = ss.str().empty();

isEmpty 会一直为真吗？

Answer 1

阅读docs .

default (1) 
explicit ostringstream (ios_base::openmode which = ios_base::out);

(1) empty constructor (default constructor) Constructs an ostringstream object with an empty sequence as content. Internally, its ostream base constructor is passed a pointer to a stringbuf object constructed with an argument based on which.

所以，是的。