Send msg.value to another address immediately

Question

Is it possible to implement a payable function and transfer msg.value to another address immediately?

function purchase() payable public {
  //transfer msg.value
}

I'm thinking this wouldn't work because the ether hasn't completely arrived in the smart contract yet.

Answer 1

nope, works just fine. Smart contracts are pretty amazing

function purchase() payable public {
  owner.transfer(msg.value);
}

Answer 2

As the previous mentioned, this work just fine. Although you need to typecast the receiving address to be payable, since the addresses and functions expecting a payment should be marked payable.

function purchase() payable public {
  payable(receivingAddress).transfer(msg.value);
}