这是在12.2 / 3：

This is in 12.2/3:

临时对象作为评估（词法）包含创建点的完整表达式（1.9）的最后一步被销毁。

Temporary objects are destroyed as the last step in evaluating the full-expression (1.9) that (lexically) contains the point where they were created.

您的行为得到保证。

有两个条件，如果满足，将延长临时生命周期。第一个是当它是一个对象的初始化时。第二个是当引用绑定到临时。

There are two conditions that, if met, will extend the lifetime of a temporary. The first is when it's an initializer for an object. The second is when a reference binds to a temporary.