Shah Rukh Khan, who has been working on an autobiography, says it's a long and slow processes it involves "giving your heart out".

During a live Twitter chat session, a social media user asked the 50-year-old actor: "How is writing of your book going on? How does it feel to write the heart out?"

The actor said: "A very very long process and slow...giving your heart out takes a bit of time."

The actor has a treat for all his fans to end the year on a high note with the release of his forthcoming filmDilwale.

Directed by Rohit Shetty, the film brings Shah Rukh and Kajol back together on screen after five years, and promises a ride full of action, adventure and fun.

Also featuring Varun Dhawan, Kriti Sanon, Varun Sharma, Johnny Lever, Boman Irani and Sanjay Mishra, the film will hit the screens on December 18.

Asked to describe Dilwale, Shah Rukh said the film is "fast and furious and funny", and went on to add thatDilwaleis an "amazing fare for the whole family with loads of comedy and action".

Over some time, Shah Rukh and Salman Khan, known for their bitter-sweet bond off screen, have been cordial and friendly. They have even been extending support to each other.

When asked by another user "Varun played a role of your younger brother... do you ever wish to have a brother in real life? #AskSRK", the actor in a cryptic way called Salman his younger brother.

He posted: "My two boys are now like my friends and brothers and everything so I am ok. And there is always bhaijaan."

Salman earlier this year featured in much-celebrated film Bajrangi Bhaijaan.