French Future Perfect
Le futur antérieur is the future perfect tense of the indicative mood. It's used to express actions that will happen before other actions in the future: it could be called 'the past of the future'.
In English, the future perfect is formed with ''will have'' + past participle of the verb, in French le futur antérieur is formed with avoir or être in le futur + past participle.
Même si ça ne marche pas, tu auras vraiment mis tout en œuvre pour réussir.Even if it doesn't work, you will certainly have made every effort to succeed.
See also: French Futur and All French tenses