istream - Handling exception std::out_of_range c++ -

i trying read flight schedules file flight class.

i experienced problemn when using microsoft visual studio 2015. tried same code on tutorialspoint c++ online compiler , works fine.

here example data of text file:

las vegas; 21:15; aa223; a3; dallas; 21:00; ba036; a3; london; 20:30; aa220; b4; mexico; 19:00; vi303; b4; london; 17:45; ba087; b4; 

here error message receive:

unhandled exception @ 0x75f25b68 in sf.exe: microsoft c++ exception: std::out_of_range @ memory location 0x00c5ee9c.

and here stream extractor in problem apparently occurs

istream &operator>>(istream &is, flight &f) {     std::string singleline;     >> singleline;     std::string s0, s1, s2, s3;     size_t loc = singleline.find(';');     s0 = singleline.substr(0, loc);     singleline.erase(0, loc + 1);     loc = singleline.find(';');     s1 = singleline.substr(1, loc - 1);     singleline.erase(0, loc + 1);     loc = singleline.find(';');     s2 = singleline.substr(1, loc - 1);     singleline.erase(0, loc + 1);     s3 = singleline.substr(1, 2);       f.set_lightno(s0);     f.set_destination(s1);     f.set_departure(s2);     f.set_gateno(s3);     return is; } 

the problem read lines with:

is >> singleline;  // <== ouch !  

the singleline end @ first whitespace encountered , not hold full line !

in example data, first whitespace after first ;. when second find(';'), return value not found, i.e. string::npos, maximum loc can contain ( avery big number). when try access substr(1, loc - 1) you're definitively out of range.

it should work if replace line with:

getline (is, singleline); // full line until nweline or eof 

suggestion:

a further improvement check read successful before else:

istream &operator>>(istream &is, flight &f) {     std::string singleline;     if (getline (is, singleline)) {          ...     }     return is; }