solidity:delete函数警告Using delete on an array leaves a gap

使用delete函数删除内容时，remix可能出现警告：
“browser/new.sol:39:119:Using delete on an array leaves a gap. The length of the array remains the same. If you want to remove the empty position you need to shift items manually and update the length property.”
经查看，delete函数在删除array中的数据时并不会改变array的长度，只会将对应量归零，array的长度需要手动修改。
如：

contract MyContract {
  uint[] array = [1,2,3];

  function removeAtIndex(uint index) returns (uint[]) {
    if (index >= array.length) return;

    for (uint i = index; i < array.length-1; i++) {
      array[i] = array[i+1];
    }

    delete array[array.length-1];
    array.length--;

    return array;
  }
}

这段代码中，使用delete删除array中的元素后，对数组长度进行了减一操作。

链接: https://github.com/miguelmota/solidity-idiosyncrasies.