Thread: realtime cin

Try looking into cin.peek( ).

>Can anyone help me figure out how to create a cin statement that does not halt a program from placing output on the screen?
cin cannot do this. What you want is a second process/thread of execution. Or you could perform some kind of non-blocking test and read to get some of that functionality:

Code:

#include <iostream>
#include <string>

// Nonstandard
#include <windows.h> // For sleep
#include <conio.h>   // For kbhit

void next_bar()
{
  static size_t pos;
  static std::string spin ( "|\\-/" );

  std::cout<< spin[pos++ % spin.length()];
  std::cout<<'\b'<<std::flush;

  Sleep ( 100 ); // Slow the bar down a bit
}

int main()
{
  std::string name;
  bool done = false;

  std::cout<<"Enter your name: "<<std::flush;

  while ( !done ) {
    if ( kbhit() ) {
      std::getline ( std::cin, name );
      done = true;
    }
    else
      next_bar();
  }

  std::cout<<"Hello, "<< name <<'!'<<std::endl;
}

But that isn't nearly as powerful as a second process, and can get cumbersome.

-Prelude

Forgot to return 0.

Originally posted by XSquared
Forgot to return 0.

I presume you're referencing Prelude's code? If so, return 0 is not required for a return from main() in C++, as it is the guaranteed default.

>I presume you're referencing Prelude's code?
Indeed.

>If so, return 0 is not required for a return from main() in C++, as it is the guaranteed default.
I didn't know that. VC++ always spits out an error whenever I forget to.

[edit]
I guess I was wrong. Checked Stroustrup's site and it does mention that. Cool
[/edit]