declaring a stream then defining it

[Gary Wessle]

Hi

can I declare an ofstream in a class declaration in .h file and define
it inside a method in the .cpp file? if so, what does the syntax of
defining it looks like.
I tried

....
ofstream out; // in .h file

and

myclass::myfun(){
....
string s = "some.file";
out(s.c_str()); //in .cpp file
....
on the line above, I get
error: no match for call to '(std:fstream) (const char*)'



so that another method uses it

myclass::myotherfun(){
out << ...


thanks

 

[Heinz Ozwirk]

Hi

can I declare an ofstream in a class declaration in .h file and define
it inside a method in the .cpp file? if so, what does the syntax of
defining it looks like.
I tried

...
ofstream out; // in .h file

This is a definition, not a declaration. A declaration would be

extern ofstream out;

but I suspect you want to define a stream variable (or member variable of
some class) and open it later.

and

myclass::myfun(){
...
string s = "some.file";
out(s.c_str()); //in .cpp file

That'd be a call of ofstream:perator()(char const*). If you want to open a
file on that stream, try

out.open(s.c_str());

HTH
Heinz