Thread: Custom Message Function

Hi!

Is it possible to create a function which behavior is exact as for function "cout"?

Instead of using "myFunc("hello %s!", personName);"
I want to do it like this:
"myFunc("hello " << personName << "!");"

If it's possible, than please give me some direction how to create such function.

Thanks!

You would need a string class that overloads the << operator. The c++ string class provides this functionality via the + operator, so you could use that. The only drawback is that it only works for string types eg. string literals, char arrays, string objects.

Code:

#include <iostream>

using std::string;

// A null string object
const string null_s = "";

int main(void)
{
    char buf[] = "Hello, World!";

    string combine = null_s + "TEST " + buf;

    std::cout << combine;
    std::cin.get();

    return 0;
}

You can just create your own class that overloads the << operator, for a number of different types. Then you can output it in whatever way you please.

I made a similar class once for debugging purposes. As I was using Win32, cout did not do anything, so I created a "debug" object. To keep track of what my programs were doing, I simply streamed messages into the object, which were then appended to an edit control in the window.

Is that what you want to do?

Yes, that's I want to do. But it seems difficult. I'm a newbie in C++.

Have you used classes very much? If not, then do that first.