February 2017
Intermediate to advanced
368 pages
8h 21m
Japanese
Content preview from Optimized C++ ―最適化、高速化のためのプログラミングテクニック
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104
6 章 動的変数割り当てを最適化する
メモリ管理関数
new
式と
delete
式は、
C++
標準ライブラリのメモリ管理関数を呼び出して、
C++
標準で「フ
リーストア」と呼んでいるメモリプールからストレージを割り当て、削除したストレージを戻
す。これらの関数は
operator new()
、配列には
operator new[]()
、
operator delete()
、配
列には
operator delete[]()
演算子にオーバーロードしたものだ。
C++
では、型を指定せず
ストレージブロックを割り当て削除する
malloc()
や
free()
のような古典的な
C
ライブラリ
メモリ管理関数も提供する。
クラスコンストラクタとクラスデストラクタ
C++
ではクラスごとに、クラスのインスタンス作成時に初期値を指定するために呼ばれるコ
ンストラクタメンバ関数を定義できる。デストラクタという別のメンバ関数は、クラスイン
スタンスが壊されるときに呼ばれる。これらのメンバ関数は、
new
式と
delete
式を使うので、
動的メンバ変数がそれを含むクラスインスタンスで自動的に管理されるという利点がある。
スマートポインタ
C++
標準ライブラリは、スコープの範囲外に出るときには指している変数を削除するという
ことを除いては、ただのポインタ型のように振る舞う「スマートポインタ」クラステンプレー
トを提供する。スマートポインタは、割り当てたストレージが配列か単一インスタンスかを覚
えており、スマートポインタの型に応じた正しい
delete ...
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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.
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.