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Struct mapping deletion detector#

Name: struct-mapping-deletion

Using delete on a (possibly nested) struct containing a mapping member does not delete the mapping.

Example#

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pragma solidity 0.8.0;

contract C {
    struct Account {
        string name;
        mapping(uint => uint) balances;  // (2)!
    }

    mapping(uint => Account) accounts;

    function clearAccount(uint id) internal {
        delete accounts[id];  // (1)!
    }
}
  1. The delete statement does not delete the Account struct mapping member balances.
  2. The balances member is not deleted.

Parameters#

The detector does not accept any additional parameters.