non-delay mode read from cin

[richard]

I am trying to do non-delay mode read from cin, i.e.
char ch;
...
while( cin.getch(ch) )
{
...
}
I want getch to return whenever there is a char typed (not wait till
a newline is seen).

How do I do this? I am using linux if it matters.

thanks,

----RICH

 

[John Harrison]

I am trying to do non-delay mode read from cin, i.e.
char ch;
...
while( cin.getch(ch) )
{
...
}
I want getch to return whenever there is a char typed (not wait till
a newline is seen).

How do I do this? I am using linux if it matters.

It's impossible in standard C or C++. The C FAQ is good on this topic, it
applies equally to C++.

http://www.eskimo.com/~scs/C-faq/q19.1.html

john

 

[Mike Wahler]

I am trying to do non-delay mode read from cin, i.e.
char ch;
...
while( cin.getch(ch) )

'cin' does not have a member function 'getch()'.

It does have two members which extract a single character
(overloads of 'get()').

{
...
}
I want getch to return whenever there is a char typed (not wait till
a newline is seen).

Not possible with standard C++.

How do I do this? I am using linux if it matters.

Try looking at your implementation's documentation to see
if there's a platform-specific extension offered for this.

-Mike

 

[Arijit]

I am trying to do non-delay mode read from cin, i.e.
char ch;
...
while( cin.getch(ch) )
{
...
}
I want getch to return whenever there is a char typed (not wait till
a newline is seen).

How do I do this? I am using linux if it matters.

thanks,

----RICH

Not possible in standard C++. Since you are using linux, check out the
GNU readline library.

-Arijit