How much Ether does a Smart Contract Address hold before a Payable Instantiation?

Question

The following code always reverts to "Contract must be empty".
But shouldn't address(this).balance == 0 if the contract hasn't even been instantiated yet?

Maybe since the contract doesn't even exist yet, neither does it's address/balance?
Even then, I thought all solidity values are set to 0 by default...

// SPDX-License-Identifier: UNLICENSED
pragma solidity >=0.5.10 <0.7.0;
contract test {
constructor() public payable {
    require(msg.value &gt; 0, &quot;User must submit a valid money amount&quot;);
    require(address(this).balance == 0, &quot;Contract must be empty&quot;);
}


}

address(this).balance >= msg.value by definition. – goodvibration Jul 18 '20 at 07:53 — goodvibration, Jul 18 '20 at 07:53

score 0 · Answer 1 · answered Jul 18 '20 at 01:18

require(msg.value > 0, "User must submit a valid money amount");

This line ensures users are sending ETH along with their transaction. Any ETH being sent is automatically added to the address(this).balance and so the deployment always fails.

Maybe since the contract doesn't even exist yet, neither does it's address/balance?

This is not actually correct. It's just a public key address even before creating the contract. In fact, you could precompute a smart contract address and send money to it before it was created: https://ethereum.stackexchange.com/a/761/33305. But as mentioned above this wasn't the problem in your code.

How much Ether does a Smart Contract Address hold before a Payable Instantiation?

1 Answers1