直到目前为止，修改对象属性时需要费一些特别的心思，例如使用左值子程序，你就可以直接操作子程序返回的标量。

Until now, special care had to be taken to allow modification of object attributes, for example. With lvalue subroutines, you can directly affect scalars returned by subroutines.

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如果无法保存子程序名，则检查DIE是否可用，并重新执行相关操作。

If you cannot store the subprogram name then start over by checking if DIE is available.

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因为Ada 2005中这样的接口只允许有抽象的子程序以及null程序作为操作。

As such interfaces in Ada 2005 are only permitted to have abstract subprograms and null procedures as operations.

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