August 2021
Intermediate to advanced
450 pages
5h 35m
Chinese
Content preview from C++语言导学（原书第2版）
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1.9 映射到硬件
C++提供到硬件的直接映射。当使用一个基本运算时，其具体实现就是硬件提供的，通常是单一机器运算。例如，两个int相加的运算x+y就是执行一条整数加法机器指令。
C++实现将机器内存看作一个内存位置序列，可在其中存放（有类型的）对象并可使用指针寻址：
指针在内存中表示为一个机器地址，因此在上图中p的数值为3。如果你觉得这看起来很像一个数组（参见1.7节），那是因为数组就是C++中对“内存中对象的连续序列”的基本抽象。
基本语言结构到硬件的简单映射对原始的底层性能是至关重要的，C和C++多年来就是以此著称的。C和C++的基本机器模型是基于计算机硬件而非某种形式的数学。
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