为什么存储开销会在C#数据类型中产生浪费? [英] Why storage overhead generates waste in C# data types?

问题描述

在子主题存储开销(在本章中)- C#5.0简而言之本书中，有这样一条一般性注释:

In subtopic Storage Overhead (on Chapter) -C# 5.0 in a Nutshell book- there is this general note that says:

现在，我想知道为什么结构 A 中的字段会浪费空间?或者，整个注释对作者有何意义?

Now, I'm wondering why the fields in struct A generates a waste of space? Or, what is the author's point with the entire note?

推荐答案

每个 byte 字段占用1个字节，而每个 long 字段占用8个字节.这意味着，尽管 b 可以放置在内存中的任何位置，但 l 仍需要放置在8的倍数的地址处.不能将其放置在地址中> 0 ，因为它已经被 b 占用；因此，必须将其放置在8的下一个可用倍数下，即 8 ，从而浪费了7个字节的中间空间.

Each byte field occupies 1 byte, whilst each long field occupies 8 bytes. This means that, whilst b could be placed anywhere in memory, l needs to be placed at an address that is a multiple of 8. It cannot be placed at address 0 since that is already occupied by b; thus, it must be placed at the next available multiple of 8, which is 8, causing the 7 bytes of intervening space to be wasted.

---------------------------------------------------------------------------------
|  0 |  1 |  2 |  3 |  4 |  5 |  6 |  7 |  8 |  9 | 10 | 11 | 12 | 13 | 14 | 15 |
---------------------------------------------------------------------------------
<--b->                                  <------------------l-------------------->
      <--------------waste------------->

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