数组是如何传递？ [英] How are arrays passed?

问题描述

由ref或值默认传递数组？
谢谢你。

Are arrays passed by default by ref or value? Thanks.

推荐答案

它们作为指针传递。这意味着，有关数组大小的所有信息都将丢失。你会好得多建议使用std ::载体，它可以通过值或引用传递，任你选择，因此它保留其所有信息。

They are passed as pointers. This means that all information about the array size is lost. You would be much better advised to use std::vectors, which can be passed by value or by reference, as you choose, and which therefore retain all their information.

下面是传递一个数组给函数的例子。注意，我们必须专门指定元素的数量，作为的sizeof（p）的将使指针的大小

Here's an example of passing an array to a function. Note we have to specify the number of elements specifically, as sizeof(p) would give the size of the pointer.

int add( int * p, int n ) {
   int total = 0;
   for ( int i = 0; i < n; i++ ) {
       total += p[i];
   }
   return total;
}


int main() {
    int a[] = { 1, 7, 42 };
    int n = add( a, 3 );
}

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