Go 言語でスライスから要素を消すには
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はじめにGo 言語に躓く人の多くはスライスの操作に躓く事が多いと思います。モダンなプログラミング言語では、スライスから要素を消すのであればの様に直感的な操作ができるはずです。しかし Go 言語の場合、スライスの伸長にて発生するメモリアロケーションを append 関数と代入を使う事で透過的に行える仕組みを採用しています。例えばスライスの伸長はarr := []int{1, 2, 3} arr = append(arr, 4) この様に行います。C言語をかじった事のある方や、プログラミング言語の内部データ構造をご存じの方であれば、リストといった物が伸長の度にメモリを再確保する様な事をやっていない事はご存じだと思います。Go 言語のスライスも同様で、スライスには長さとキャパシティを持っており、キャパシティを超えない範囲で長さだけが増えていき、キャパシティを超えるとメモリが再確保されるという作りになっています。ですので、上記のコードであれば、スライス(実際は SliceHeader)が内部で持っているポインタ、長さ、キャパシティを、代入してやる事で上書きしています。スライスから要素を消すスライスの伸長と同様に、要素の削除もスライス自身を更新しなければなりません。Go…

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Related Topics: Go (programming language)
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