Why I got "operation may be undefined" in Statement Expression in C++?
为什么我的“操作可能是不确定的”语句表达的C + +？
The behavior of this operation is undefined if the specified collection is modified while the operation is in progress.
如果在操作过程中，指定的集合已被修改，则此操作的行为是未定义的。
Otherwise, the operation is erroneous and its outcome is undefined.
否则的话，这一操作是错误并且它的结果是未定义的。
When you load content from a URL, the default value is undefined until the load operation has started.
从URL加载内容时，直到开始加载操作，才会定义默认值。
When you load content from a URL, the default value is undefined until the load operation has started.
从URL加载内容时，直到开始加载操作，才会定义默认值。
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