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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14.6 向量算术
11.2节介绍的vector被设计成一种通用的保存值的机制，它足够灵活，也能够适应容器、迭代器和算法的架构。但它不支持数学上的向量运算。为vector提供这类运算并不难，但它的泛化能力和灵活性妨碍了性能优化，而这通常是重要数值计算任务所必需的。因此，标准库在<valarray>中提供了一个类似于vector的模板valarray，其通用性较弱，但针对数值计算进行了必要的优化：
valarray支持常见的算术运算和大多数数学函数，例如：
除了算术运算，valarray还支持跨越式访问，这为实现多维运算提供了支持。
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