Fstream declaration

I need to be able to use a function multiple times with a differe开发者_开发知识库nt file. I have this piece of code:

fstream in(inf, ios::in);

where inf is a string with a .mpp extension, and it doesn't work (the declaration) can you please help me? :)

You probably want:

 fstream in(inf.c_str(), ios::in);

Better yet, use an ifstream:

string mpp = "foobar.mpp";
ifstream in( mpp.c_str() );

I don't understand why people don't use the specialised input and output streams when they only want to perform one of input or output.

As I may infer of your "doesn't work" responses, maybe you have to:

a) Include the fstream header.

b) Use std:: prefix for fstream (or ifstream)

#include <fstream>
// ...
std::ifstream in (inf.c_str());

(note that if you use ifstream you don't have to specify ios::in)

Hmm.

Maybe try to wrap this function in some file hanlder object. Then just include file handler header in working files and use as much as you like..