September 2019
Intermediate to advanced
428 pages
11h 50m
German
Content preview from Ethereum – Grundlagen und ProgrammierungBecome 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,
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Ungeprüfte CALL-Rückgabewerte
Es gibt bei Solidity verschiedene Möglichkeiten, externe Aufrufe durchzuführen. Der Versand von Ether an externe Accounts erfolgt üblicherweise über die transfer-Methode. Die send-Funktion kann aber ebenfalls genutzt werden, und wenn es besonders flexibel sein soll, kann man den CALL-Opcode auch direkt in Solidity nutzen. Die call- und send-Funktionen geben einen booleschen Wert zurück, der angibt, ob der Aufruf erfolgreich war oder nicht. Man muss daher mit diesen Funktionen vorsichtig sein, da die sie ausführenden Transaktionen nicht rückgängig gemacht werden, wenn der (durch call oder send initialisierte) Aufruf fehlschlägt. Vielmehr geben die Funktionen einfach false zurück. Ein gängiger Fehler ist, dass der ...
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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.
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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.