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I would like to see an example of a function modified as payable in practice. I would like for it to accept payment and hold the ether.

I would like to read another function in the same contract that can send the held ether to a specific address.

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A really basic example from https://programtheblockchain.com/posts/2017/12/15/writing-a-contract-that-handles-ether/:

pragma solidity ^0.4.17;

contract CommunityChest {
    function withdraw() public {
        msg.sender.transfer(this.balance);
    }

    function deposit(uint256 amount) payable public {
        require(msg.value == amount);
        // nothing else to do!
    }

    function getBalance() public view returns (uint256) {
        return this.balance;
    } 
}
  • Where the money this.balance come from? – Kuelf Deez Mar 12 '18 at 3:23
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    It's the ether held by the contract. E.g. the ether sent via calls to deposit. – smarx Mar 12 '18 at 3:24
  • What happens to money 'paid' to deposit() if nothing is done? What's this (here) exactly? – Kuelf Deez Mar 12 '18 at 3:25
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    I'm not sure I understand the question. If money is transferred in a call to deposit, then... that's it. It's been transferred. The account that sent the transaction now has less ether and the contract has more ether. this is a variable that refers to the contract. – smarx Mar 12 '18 at 3:27
  • Alright. That answer my question. I didn't understand that a contract holds a single pot of all the money sent to it. – Kuelf Deez Mar 12 '18 at 3:31

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