solidity_sample_code/testBool.sol at main · lbc-team/solidity_sample_code · GitHub

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// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.0;

contract testBool {

    bool public isOpen = true;
    bool public isChanged = false;

    function setOpen(bool o) public  {
        isOpen = o;
        if( isOpen || tryChange() ) {
            // ....
        }
    }

    function tryChange() internal returns (bool) {
        isChanged = !isChanged;
        return isChanged;
    }

}