b7d60f2f9a
* Bump required compiler version to 0.5.2. * Fix shadowed variable warning in ERC20Migrator. * Rename Counter to Counters. * Add dummy state variable to SafeERC20Helper. * Update changelog entry. * Fix CountersImpl name. * Improve changelog entry.
41 lines
951 B
Solidity
41 lines
951 B
Solidity
pragma solidity ^0.5.2;
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/**
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* @title Roles
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* @dev Library for managing addresses assigned to a Role.
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*/
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library Roles {
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struct Role {
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mapping (address => bool) bearer;
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}
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/**
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* @dev give an account access to this role
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*/
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function add(Role storage role, address account) internal {
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require(account != address(0));
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require(!has(role, account));
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role.bearer[account] = true;
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}
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/**
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* @dev remove an account's access to this role
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*/
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function remove(Role storage role, address account) internal {
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require(account != address(0));
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require(has(role, account));
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role.bearer[account] = false;
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}
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/**
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* @dev check if an account has this role
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* @return bool
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*/
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function has(Role storage role, address account) internal view returns (bool) {
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require(account != address(0));
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return role.bearer[account];
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}
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}
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