pragma solidity >=0.4.24;

import "../interface/IERC165.sol";

/**
 * @dev Implementation of standard for detect smart contract interfaces.
 */
contract SupportsInterface is IERC165 {
  /**
   * @dev Mapping of supported intefraces.
   * @notice You must not set element 0xffffffff to true.
   */
  mapping(bytes4 => bool) internal supportedInterfaces;

  /**
   * @dev Contract constructor.
   */
  constructor() public {
    supportedInterfaces[0x01ffc9a7] = true; // ERC165
  }

  /**
   * @dev Function to check which interfaces are suported by this contract.
   * @param _interfaceID Id of the interface.
   */
  function supportsInterface(bytes4 _interfaceID) external view returns (bool) {
    return supportedInterfaces[_interfaceID];
  }
}