c++ - Why does reading a record struct fields from std::istream fail, and how can I fix it? -

suppose have following situation:

• a record struct declared follows

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struct person {     unsigned int id;     std::string name;     uint8_t age;     // ... }; 

• records stored in file using following format:

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id      forename lastname age ------------------------------ 1267867 john     smith    32 67545   jane     doe      36 8677453 gwyneth  miller   56 75543   j. ross  unusual  23 ... 

the file should read in collect arbitrary number of person records mentioned above:

std::istream& ifs = std::ifstream("sampleinput.txt"); std::vector<person> persons;  person actrecord; while(ifs >> actrecord.id >> actrecord.name >> actrecord.age) {     persons.push_back(actrecord); }  if(!ifs) {     std::err << "input format error!" << std::endl; }  

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question: (that's asked question, in 1 or other form)
can read in separate values storing values 1 actrecord variables' fields?

the above code sample ends run time errors:

runtime error    time: 0 memory: 3476 signal:-1 stderr: input format error! 

one viable solution reorder input fields (if possible)

id      age forename lastname 1267867 32  john     smith     67545   36  jane     doe       8677453 56  gwyneth  miller    75543   23  j. ross  unusual   ... 

and read in records follows

#include <iostream> #include <vector>  struct person {     unsigned int id;     std::string name;     uint8_t age;     // ... };  int main() {     std::istream& ifs = std::cin; // open file alternatively     std::vector<person> persons;      person actrecord;     unsigned int age;     while(ifs >> actrecord.id >> age &&            std::getline(ifs, actrecord.name)) {         actrecord.age = uint8_t(age);         persons.push_back(actrecord);     }      return 0; }