如何获取数组的大小？ [英] How to get the size of an Array?

问题描述

在C＃中，我使用嵌入到数组的Length属性，我想得到的大小。
如何在C ++中做到这一点？

In C# I use the Length property embedded to the array I'd like to get the size of. How to do that in C++?

推荐答案

C / C ++中的数组不会将它们的长度存储在内存中，它不可能找到它们的大小纯粹给一个指向数组的指针。使用这些语言中的数组的任何代码都依赖于常量已知的大小，或者传递一个指定其大小的单独变量。

Arrays in C/C++ do not store their lengths in memory, so it is impossible to find their size purely given a pointer to an array. Any code using arrays in those languages relies on a constant known size, or a separate variable being passed around that specifies their size.

这是一个常见的解决方案，提出问题，就是使用 std :: vector 类从标准库，它更接近一个托管（C＃）数组，即存储它的长度，另外还有一些有用的成员函数（用于搜索和操作）。

A common solution to this, if it does present a problem, is to use the std::vector class from the standard library, which is much closer to a managed (C#) array, i.e. stores its length and additionally has a few useful member functions (for searching and manipulation).

使用 std :: vector ，您可以简单地调用 vector.size（）长度。

Using std::vector, you can simply call vector.size() to get its size/length.

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