32-Solidity8.0-调用父级合约函数

源码：

pragma solidity ^0.8.7;

/*
calling parent functions
- direct
- super

     E
  /    \
  F     G
   \   /
     H

*/
contract E {
    event Log(string message);

    function foo() public virtual {
        emit Log("E.foo");
    }

    function bar() public virtual {
        emit Log("E.bar");
    }
}

contract F is E {
    function foo() public virtual override {
        emit Log("F.foo");
        E.foo();

    }

    function bar() public virtual override {
        emit Log("F.bar");
        super.bar();
    }
}

contract G is E {
    function foo() public virtual override {
        emit Log("G.foo");
        E.foo();

    }

    function bar() public virtual override {
        emit Log("G.bar");
        super.bar();
    }
}

contract H is F, G {
    function foo() public  override(F, G) {
        F.foo();
    }

    function bar() public override (F, G)  {
        super.bar();
    }
}