使用16位整数的重要性

问题描述

开发人员在编写代码时如何认真考虑使用16位整数?自从进行编程以来，我一直在使用32位整数，我真的不考虑使用16位.

How seriously do developers think about using a 16bit integer when writing code? I've been using 32bit integers ever since I've been programming and I don't really think about using 16bit.

声明32位int十分容易，因为它是大多数语言的默认设置.

Its so easy to declare a 32bit int because its the default for most languages.

除了节省一点内存外，使用16位整数还有什么好处?

Whats the upside of using a 16bit integer apart from a little memory saved?

推荐答案

为大量数值分配内存时，几乎没有多少内存可以节省[读取:50％].常见用途是:

It's hardly a little memory saved [read: 50%] when you allocate memory for a large number of numeric values. Common uses are:

• COM和外部设备互操作
• 减少大型阵列的内存消耗，大型阵列每个数字的大小永远不会超过数千个
• 对象对的唯一散列，其中最多需要约65K个对象.(散列值只能是32位整数，但是请注意，散列表的类型必须转换内部表示的值，因此冲突仍然存在可能，但是相等可以基于精确的哈希匹配)
• 依靠structs加速算法(较小的值类型在内存中复制时会提高性能)

• COM and external device interop
• Reducing memory consumption for large arrays where each number will never exceed a couple thousands in magnitude
• Unique hashes for pairs of objects, where no more than ~65K objects are needed (hash values can only be 32-bit ints, but note that hash table types must transform the value for internal representations so collisions are still likely, but equality can be based on exact hash matches)
• Speed up algorithms that rely on structs (smaller sized value types translates to increased performance when they are copied around in memory)

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