C++ - stringstream

std::basic_stringstream

std::basic_stringstream

• The class template std::basic_stringstream implements input and output operations on string based streams. It effectively stores an instance of std::basic_string and performs the input and output operations on it.

• In C++, stringstream is useful when retrieving suitable information for the required data type from a given string. Extracts information of data types that match a string except for spaces and ‘\n’ from stringstream.

• Example

#include <iostream>
#include <iomanip>
#include <sstream>
 
int main()
{
    std::string input = "41 3.14 false hello world";
    std::istringstream stream(input);
    int n;
    double f;
    bool b;
 
    stream >> n >> f >> std::boolalpha >> b;
    std::cout << "n = " << n << '\n'
              << "f = " << f << '\n'
              << "b = " << std::boolalpha << b << '\n';
 
    // extract the rest using the streambuf overload
    stream >> std::cout.rdbuf();
    std::cout << '\n';
}

• Output n = 41
  f = 3.14
  b = false
  hello world