Thread: Differences between std::cin.ignore() and std::cin.rdbuf()->in_avail()+1

can someone tell me the difference between

Code:

std::cin.ignore()

and

Code:

std::cin.rdbuf()->in_avail()+1

I was reading a book and it told me to input

Code:

std::cin.rdbuf()->in_avail()+1

I figured out that putting

Code:

cin.ignore()

would produce the same result, by letting the program to wait for user to press enter before ending the program.

Also, can someone tell me how does

Code:

std::cin.rdbuf()->in_avail()+1

work?

Thanks in advance ^^ Merry Chrismas~

It sounds really dodgy to me. I might be wrong though.

So it asks for the read buffer, gets the number of characters still in the buffer (which, I think, is implementation dependent so means next to nothing for your program). It returns an integer (streamsize type to be exact), which is not a reference. So adding one to it will do absolutely nothing unless you use the result.

So, it sounds to me like it should do nothing at all. Or is this some kind of stupid Microsoft stuff?

Are you sure that a character is ignored with just that line?