标签:code Solidity0.8 require error used Error conditions check
An error will undo all changes made to the state during a transaction.
You can throw an error by calling require
, revert
or assert
.
require
is used to validate inputs and conditions before execution.revert
is similar torequire
. See the code below for details.assert
is used to check for code that should never be false. Failing assertion probably means that there is a bug.
Use custom error to save gas.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.13;
contract Error {
function testRequire(uint _i) public pure {
// Require should be used to validate conditions such as:
// - inputs
// - conditions before execution
// - return values from calls to other functions
require(_i > 10, "Input must be greater than 10");
}
function testRevert(uint _i) public pure {
// Revert is useful when the condition to check is complex.
// This code does the exact same thing as the example above
if (_i <= 10) {
revert("Input must be greater than 10");
}
}
uint public num;
function testAssert() public view {
// Assert should only be used to test for internal errors,
// and to check invariants.
// Here we assert that num is always equal to 0
// since it is impossible to update the value of num
assert(num == 0);
}
// custom error
error InsufficientBalance(uint balance, uint withdrawAmount);
function testCustomError(uint _withdrawAmount) public view {
uint bal = address(this).balance;
if (bal < _withdrawAmount) {
revert InsufficientBalance({balance: bal, withdrawAmount: _withdrawAmount});
}
}
}
标签:code,Solidity0.8,require,error,used,Error,conditions,check 来源: https://www.cnblogs.com/zaleswift/p/16538413.html
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