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Use errors in examples.

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chriseth
2021-03-30 23:04:32 +02:00
parent 0c1be06cba
commit 786ae2ceec
4 changed files with 128 additions and 63 deletions
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docs/examples/safe-remote.rst
+18 -14
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@@ -26,7 +26,7 @@ you can use state machine-like constructs inside a contract.
::
// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;
pragma solidity ^0.8.4;
contract Purchase {
uint public value;
address payable public seller;
@@ -41,27 +41,30 @@ you can use state machine-like constructs inside a contract.
_;
}
/// Only the buyer can call this function.
error OnlyBuyer();
/// Only the seller can call this function.
error OnlySeller();
/// The function cannot be called at the current state.
error InvalidState();
/// The provided value has to be even.
error ValueNotEven();
modifier onlyBuyer() {
require(
msg.sender == buyer,
"Only buyer can call this."
);
if (msg.sender != buyer)
revert OnlyBuyer();
_;
}
modifier onlySeller() {
require(
msg.sender == seller,
"Only seller can call this."
);
if (msg.sender != seller)
revert OnlySeller();
_;
}
modifier inState(State _state) {
require(
state == _state,
"Invalid state."
);
if (state != _state)
revert InvalidState();
_;
}
@@ -76,7 +79,8 @@ you can use state machine-like constructs inside a contract.
constructor() payable {
seller = payable(msg.sender);
value = msg.value / 2;
require((2 * value) == msg.value, "Value has to be even.");
if ((2 * value) != msg.value)
revert ValueNotEven();
}
/// Abort the purchase and reclaim the ether.