T [N]和std :: array< T，N>之间的差异 [英] Difference between T[N] and std::array<T,N>

问题描述

我的问题很简单，但是更具体地说，我想引述 Stroustrup11 。

My question is pretty straightforward, but to be more specific I want to quote 2 lines from Stroustrup11.

1. T [N] 固定大小的内置数组：N个T类型的连续元素；
   no size（）或其他成员函数


2. array< T，N> 一个T类型的N个连续元素的固定大小的数组；
   就像内置数组一样，但是可以解决大多数问题

1. T[N] A fixed-size built-in array: N contiguous elements of type T; no size() or other member functions
2. array<T,N> A fixed-size array of N contiguous elements of type T; like the built-in array, but with most problems solved

那么作者提到的有什么区别？以及 std :: array< T，N> 解决了什么问题？

So what is the difference the author is mentioning? And what problems are solved for std::array<T,N> ?

推荐答案

主要区别在于 std :: array< T，N> 不会衰减到指向第一个元素的指针，其中 T [N] 将和作为 std :: array< T，N>的值副本。 。

The principal differences are that std::array<T, N> doesn't decay to a pointer to the first element where T[N] would, and you can take a value copy of a std::array<T, N>.

std :: array 还提供了一些有用的功能，例如字典比较

std::array also offers some useful functions, such as lexicographical comparison operators.

但是由于 N 必须是可编译时可评估的常量表达式，因此 std :: vector< T> 通常是首选。

But because N has to be a compile time evaluable constant expression, std::vector<T> is often the preferred choice.

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