来源：https://en.cppreference.com/w/cpp/io/basic_stringstream

继承关系

Member types

Member functions

• (constructor) constructs the string stream (public member function)
• operator= (C++11) moves the string stream (public member function)
• swap (C++11) swaps two string streams (public member function)
• rdbuf returns the underlying raw string device object (public member function)

String operations

• str gets or sets the contents of underlying string device object (public member function)
• view (C++20) obtains a view over the contents of underlying string device object (public member function)

stringstream 的使用

try {
    //pass
} catch (const std::exception& e) {
    std::stringstream ss;
    ss << e.what();
    std::string msg = ss.str();
}

Inherited from std::basic_istream

Member functions

有格式的 - operator>> extracts formatted data (public member function of std::basic_istream)

无格式的

• get extracts characters (public member function of std::basic_istream)
• peek reads the next character without extracting it (public member function of std::basic_istream)
• unget unextracts a character (public member function of std::basic_istream)
• putback puts a character into input stream (public member function of std::basic_istream)
• getline extracts characters until the given character is found (public member function of std::basic_istream)
• ignore extracts and discards characters until the given character is found (public member function of std::basic_istream)
• read extracts blocks of characters (public member function of std::basic_istream)
• readsome extracts already available blocks of characters (public member function of std::basic_istream)
• gcount returns number of characters extracted by last unformatted input operation (public member function of std::basic_istream) Positioning
• tellg returns the input position indicator (public member function of std::basic_istream)
• seekg sets the input position indicator (public member function of std::basic_istream)