Very Easy Question

Code:

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ifstream file_input("myinputfile.txt");

cout << file_input.something; // prints "myinputfile.txt"

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What is the "something" above?

Like this?

Code:

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#include <iostream>
#include <string>

struct ifstream
{
    std::string something;
    ifstream(const std::string& sth): something(sth) {}
};

using std::cout;

int main(){
    ifstream file_input("myinputfile.txt");

    cout << file_input.something; // prints "myinputfile.txt"
}

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Or what is your question? I don't think ifstream stores the name of the file if that's what you mean. If you opened the file, the name was available to you - why can't you use that?

Quote:

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Originally Posted by anon

Like this?

Code:

---

#include <iostream>
#include <string>

struct ifstream
{
    std::string something;
    ifstream(const std::string& sth): something(sth) {}
};

using std::cout;

int main(){
    ifstream file_input("myinputfile.txt");

    cout << file_input.something; // prints "myinputfile.txt"
}

---

Or what is your question? I don't think ifstream stores the name of the file if that's what you mean. If you opened the file, the name was available to you - why can't you use that?

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I want to have an error when the file can't be opened. I want it to say:

cout << "Error! " << (filename) << " could not be opened!";

The name of the file will eventually be a command line argument to the program, therefore it will change.

Not possible?

If it is a command line argument then it is stored in a variable? Why can't you use that?

Code:

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string name = "somefile.txt";
ifstream fin(name.c_str());
if (!fin) {
    cout << "Couldn't open " << name;
}

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You're specifying the filename when you open the file, so you must know it.
If it can't be opened, just print that filename.

Quote:

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Originally Posted by Elysia

You're specifying the filename when you open the file, so you must know it.
If it can't be opened, just print that filename.

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Ah yes... Nevermind

When I (eventually) code it to work with command line arguments, I can access it that way through those arguments

Thanks