确定数组的大小，如果传递给函数 [英] determine size of array if passed to function

问题描述

是否有可能确定数组的大小，如果它被传递到另一个功能（大小不通过）？数组初始化像int数组[] = {} XXX ..

Is it possible to determine the size of an array if it was passed to another function (size isn't passed)? The array is initialized like int array[] = { XXX } ..

据我所知，这是不可能做到的sizeof，因为它会返回指针的大小..我之所以问是因为我需要为其中数组传递另一个函数内循环运行。我想是这样的：

I understand that it's not possible to do sizeof since it will return the size of the pointer .. Reason I ask is because I need to run a for loop inside the other function where the array is passed. I tried something like:

for( int i = 0; array[i] != NULL; i++) {
........
}

不过，我注意到，在数组的近端，数组[我]有时含有像758433垃圾值这是不是在数组的初始化指定的值。

But I noticed that at the near end of the array, array[i] sometimes contain garbage values like 758433 which is not a value specified in the initialization of the array..

推荐答案

其他答案忽视的C一个特点++。您可以按引用传递数组和使用模板：

The other answers overlook one feature of c++. You can pass arrays by reference, and use templates:

template <typename T, int N>
void func(T (&a) [N]) {
    for (int i = 0; i < N; ++i) a[i] = T(); // reset all elements
}

那么你可以这样做：

then you can do this:

int x[10];
func(x);

但请注意，这只是作品的阵列，不是指针。

然而，由于其他答案已经指出的那样，使用的std ::矢量是一个更好的选择。

However, as other answers have noted, using std::vector is a better choice.

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