April 2020
Intermediate to advanced
506 pages
20h 7m
Polish
Content preview from Go
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
336 Rozdział 11.
Nieudane asercje typów
Wydaje się, że wszystko działa świetnie — przynajmniej dla wartości typu
TapeRecorder
. Co się jednak stanie, jeśli spróbujesz przekazać do funkcji
TryOut
wartość typu
TapePlayer
? Jak dobrze będzie działać to rozwiązanie,
jeśli wziąć pod uwagę, że używasz asercji typu z twierdzeniem, iż parametr
funkcji
TryOut
jest w rzeczywistości typu
TapeRecorder
?
Kod kompiluje się, ale przy próbie uruchomienia
go następuje panika. Zgodnie z oczekiwaniami
próba stwierdzenia, że wartość typu
TapePlayer
jest wartością typu
TapeRecorder
, nie kończy
się dobrze. To stwierdzenie nie jest przecież
prawdziwe.
type Player interface ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.