什么是近指针、远指针和巨指针? [英] What are near, far and huge pointers?

问题描述

谁能用一个合适的例子向我解释这些指针......以及何时使用这些指针?

Can anyone explain to me these pointers with a suitable example ... and when these pointers are used?

推荐答案

在过去，根据 Turbo C 手册，当整个代码和数据适合一个段时，近指针只有 16 位.远指针由段和偏移量组成，但未执行规范化.一个巨大的指针被自动规范化.可以想象，两个远指针可以指向内存中的同一位置但不同，而指向同一内存位置的规范化大指针将始终相等.

In the old days, according to the Turbo C manual, a near pointer was merely 16 bits when your entire code and data fit in the one segment. A far pointer was composed of a segment as well as an offset but no normalisation was performed. And a huge pointer was automatically normalised. Two far pointers could conceivably point to the same location in memory but be different whereas the normalised huge pointers pointing to the same memory location would always be equal.

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