Lets say i have this error:

error Main__ContractNotAllowed();

And also i have this modifier which checks this mapping:

mapping (address => bool) private isAllowed;

modifier onlyAllowedContracts() {
    require(isAllowed[msg.sender] == true);

Now i wanna put error inside this modifier which every time this function reverts ,this error shows up. is it possible? or i should do this in another way?

Thank you.

1 Answer 1


You can design it like this:

modifier onlyAllowedContracts() {
    if (isAllowed[msg.sender] != true) revert Main__ContractNotAllowed();

  • I figured out in this exact way couple minutes after posting this question, But thank you.
    – Alireza
    Commented Jan 24, 2023 at 9:47

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