// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC20.sol";

abstract contract ERC20Capped is ERC20 {

  uint256 private immutable _cap;

  constructor(uint256 cap_) {

    require(cap_ > 0, "ERC20Capped: cap is 0");

    _cap = cap_;

  }

  function cap() public view returns (uint256) {

    return _cap;

  }

  // Override _mint to enforce the cap.

  function _mint(address account, uint256 amount) internal virtual {

    require(totalSupply() + amount <= _cap, "ERC20Capped: cap exceeded");

    // Call parent _mint function (not shown here)

  }

}