December 2013
Intermediate to advanced
560 pages
11h 4m
German
Content preview from C++11 für ProgrammiererBecome 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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Anhang C. Resource Acquisition Is Initialization
Resource Acquisition Is Initialization, kurz RAII, bezeichnet eine beliebte Programmiertechnik in C++, bei der die Ressourcenbelegung und -freigabe an den Lebenszyklus einer Objekts gebunden werden. Konkret heißt dies, dass die Ressource – das kann ein Mutex, eine Datei oder auch dynamischer Speicher sein – im Konstruktor des Objekts initialisiert und im Destruktor wieder freigegeben wird. Das ist in C++ möglich, da insbesondere der Destruktor eines Objekts genau dann aufgerufen wird, wenn das Objekt seinen Gültigkeitsbereich verliert.
Dieses deterministische Verhalten lässt sich am besten anhand eines kleinen Programms aufzeigen:
raii.cpp
01 #include <iostream> 02 #include <string> 03 04 class ResourceGuard{ ...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,
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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.