how to reuse stringstream

Question

These threads do NOT answer me:

resetting a stringstream

How do you clear a stringstream variable?

        std::ifstream file( szFIleName_p )         


        

Answer 1

Imagine a config file.

par1=11
par2=22

codes:

std::string line, strpar1, strpar2;
int par1, par2;
std::ifstream configfile("config.cfg");

std::getline(configfile, line);    // first line to variable "line"
std::istringstream sline(line);
while (std::getline(sline, strpar1, '='));
par1 = std::stoi(strpar1);  // par1 get 11

bool b = sline.eof(); // true

std::getline(configfile, line);    // second line to variable "line"
sline.clear();    //
sline.str(line);    // reuse "sline"

b = sline.good();  // true  // goodbit is zero, indicating that none of the other bits is set.
b = sine.fail();  // false
b = sline.bad();  // false
b = sline.eof(); // false

while (std::getline(sline, strpar2, '='));
par2 = std::stoi(strpar2);  // par2 get 22

goodbit is zero, indicating that none of the other bits is set