既然我们有了 std::array，C 风格的数组还有什么用处?

问题描述

std::array 远远优于 C 数组.即使我想与遗留代码互操作，我也可以只使用 std::array::data().我有什么理由想要一个老式的数组吗?

std::array is vastly superior to the C arrays. And even if I want to interoperate with legacy code, I can just use std::array::data(). Is there any reason I would ever want an old-school array?

推荐答案

除非我遗漏了一些东西(我没有太密切关注标准中的最新变化)，C 风格数组的大部分用途仍然存在.std::array 确实允许静态初始化，但它仍然不会为您计算初​​始化器.因为在 std::array 之前 C 风格数组的唯一真正用途是用于静态初始化表大致如下:

Unless I've missed something (I've not followed the most recent changes in the standard too closely), most of the uses of C style arrays still remain. std::array does allow static initialization, but it still won't count the initializers for you. And since the only real use of C style arrays before std::array was for statically initialized tablesalong the lines of:

MyStruct const table[] =
{
    { something1, otherthing1 },
    //  ...
};

使用通常的 begin 和 end 模板函数(在C++11) 来迭代它们.没有提到大小，编译器根据初始化程序的数量确定.

using the usual begin and end template functions (adopted inC++11) to iterate over them. Without ever mentionning the size, which the compiler determines from the number of initializers.

我忘记的另一件事:字符串文字仍然是 C 风格的数组；即类型 char[].我认为没有人会因为我们有 std::array 而排除使用字符串文字.

Another thing I forgot: string literals are still C style arrays; i.e. with type char[]. I don't think that anyone would exclude using string literals just because we have std::array.

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