D语言：初始化动态多维数组最佳实践？ [英] D language: initializing dynamic multidimensional array best practices?

问题描述

请问这是否是在 D 中初始化动态多维数组的最佳实践。在他们的语言参考中有关于数组的部分，但我不确定它是否超出了我要完成的工作。

Just curious if this is the best practice for initializing a dynamic, multidimensional array in D. There is a section on arrays in their language reference, but I'm not quite sure if it goes over what I'm trying to accomplish.

class Map {
    Tile[][] tiles;

    this(uint width, uint height) {
        tiles.length = height;
        foreach (ref tilerow; tiles)
            tilerow.length = width;
    }
}

Map map1 = new Map(5000, 3000); // values determined at runtime

（或类似的替代方法，例如（y = 0; y< ; height; y ++）循环）。

(or an equivalent alternative like a typical for (y=0;y<height;y++) loop).

对此我的担心是，它会分别重新分配数组的每一行，而不是一次重新分配整个块，所以我不这样做不知道这是否会导致过多的内存改组。另外，我相信不能保证它是连续的（在这种情况下，由于 tiles 只是一个指针数组）。是否有任何更好的方法（不涉及使用一维数组和自己计算索引）？据我所知，在编译时只能用不可变的维声明连续的多维数组，只是想知道我是否缺少某些东西...

My concern with this is that it reallocates each row of the array separately rather than the whole chunk all at once, so I don't know if this will lead to too much memory shuffling. Also, I believe it's not guaranteed to be contiguous (since tiles is just an array of pointers in this case). Is there any "better" way to do this (that doesn't involve using a single-dimensional array and computing the index myself)? As far as I can tell from the docs a contiguous multidimensional array can only be declared with immutable dimensions at compile time, just wondering if I'm missing something...

推荐答案

您可以至少在D2中 new 数组：

You can new the array, at least in D2:

Tile[][] tiles = new Tile[][](height, width);

我相信这是最佳做法。

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