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THE PERFECT INFINITIVE with TO (to have + past participle) can be used to refer to: 

1. an event that will be completed at a point in the future. It has the same kind of meaning as FUTURE PERFECT, which is used for actions that will be completed before some other point in the future.

"I hope to have finished the job by next Monday." (I hope that I will have finished the job by next Monday)

It is often used with verbs like HOPE, EXPECT, WANT, etc. to express a desired result that the speaker hopes/expects/wants to achieve at a point in the future.

"Before I turn 40, I want to have written a book."

2. an event in the future which is earlier than another event in the future on which it has some bearing or to which it is relevant.

"She will be delighted to have been invited to join the faculty."

There's an ambiguity, however, which context must clear up. We don't know whether the invitation has already been made at the time of that utterance (she just doesn't know about it yet) or if the speaker is looking forward to a time when it will have been made.

"I must ring him at 3am, though I'm sure he will be annoyed to have been woken up." 

In the example above, the event definitely hasn't happened yet (but definitely will happen). 

"We can hide it under this bush, and it will appear to have been stolen."

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