Contract 'throw' - ether sent by the contract also reverted?

Question

If a contract throws a exception (using 'throw') is any ether sent by the contract to other contracts or external accounts also reverted?

I understand that any contract callers have the ether value returned (refunded) but I am unsure what happens to the contract ether balance when sending ether to other contracts or accounts.

Answer 1

Everything, with a handful of exceptions, is reverted. Balance changes, contract state changes, state changes in other contracts, you get the picture.

It's almost as if the transaction never happened. Here's the handful of exceptions:

• The gas is still spent. (In fact, all of it is.)
• The transaction still occupies space in the block. Anyone can see what happened to the transaction.
• The nonce of the account that sent the transaction is increased, to prevent replay attacks.

Additional details on throw best practices can be found in this blog post.