我们为什么不能传递数组按值的功能？ [英] Why can't we pass arrays to function by value?

问题描述

显然，我们可以通过复杂的类实例功能，但为什么我们不能传递数组功能？

Apparently, we can pass complex class instances to functions, but why can't we pass arrays to functions?

推荐答案

起源是历史。问题在于规则数组衰变为指针，传递给函数时，很简单。

The origin is historical. The problem is that the rule "arrays decay into pointers, when passed to a function" is simple.

复制阵列将是一种复杂的，不是很清楚，因为行为会为不同的参数和不同的函数声明更改。

Copying arrays would be kind of complicated and not very clear, since the behavior would change for different parameters and different function declarations.

请注意，您仍然可以通过值来间接通：

Note that you can still do an indirect pass by value:

struct A { int arr[2]; };
void func(struct A);

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