C + + must be aware of (vi) array parameters

Notes:

C + + There is no such thing as an "array parameter", which, when passed in, essentially passes only a pointer to its first element.

void average( int array[12] ); // 形参是一个int *
void average( int array[] ); // 形参仍然是一个int *
void average( int (&array)[12] ); // 现在函数只能接受大小为12的整型数组
// 注意：不可以使用int *初始化 int(&)[n]

template< int n >
void average( int (&array)[n]); // 借助模板使代码泛化

void average_n(int array[], int nSize); // 传统做法是把数组大小明确传入函数

template< int n >
inline void average( int (&array)[n] ) // 模板与传统做法结合实现
{
average_n(array, n);
}

In the case of multidimensional arrays, the following declaration statements are equal, but the second boundary (and subsequent) of the array is not degraded:

void process( int array[10][20] ); // 形参是指向数组首元素的指针
void process( int (*array)[20] ); // 形参是指向一个具有20个元素的数组的指针
void process( int array[][20] ); // 形参是指针，但是比前边两个语句更加清晰

Similarly, with templates and traditional practices, you can implement array parameter input without explicit incoming size:

void process_2d(int *arr, int n, int m);

template< int n, int m >
inline void process( int (&array)[n] )
{
process_2d(array, n, m);
}