Problem : File opening with a variable containing a string

[phadeb]

Hello everybody,


This code works :

ofstream result("jonathan.txt");

Why not this one ?

   string name = "jonathan";
   string resultFile = name;
   resultFile.append(".txt");
   cout << resultFile << endl;
   ofstream result(resultFile); //line 15 

The error is :

C:\Users\**\Desktop\projects\2.1\main.cpp|15|error: no matching function for call to 'std::basic_ofstream<char, std::char_traits<char> >::basic_ofstream(std::string&)'|

Knowing that :

resultFile == "jonathan.txt" IS TRUE

- Why doesn't it work ?
- What is the shortest solution to make it work ?


Have a good day :-)

[kbw]

ofstream result(resultFile.c_str());

[phadeb]

Thanks, works like a charm :-)

I still don't quite understand by the way why is the function accepting c-strings only.

[Disch]

I always thought it was weird too. They could have easily added an overload to accept std::strings.

[ne555]

or

std::string::operator const char* const() const{
  return this->c_str();
}

Edit: const correct

[Disch]

casting operators are error prone, though. But yeah they could've done any number of things.