Passing array lengths through templates to functions in C + +

Source: Internet
Author: User

We know that in C + +, when an array is passed to a function, it actually transmits the first address of the array, which is a pointer type. So, in a function, we have no way of knowing how long the length of the array is passing in, and a common way is to add another parameter to record the length of the array passed in.

In C + +, however, using the template mechanism is a good way to solve this problem, as shown in the following code:

#include <iostream>
using namespace std;
template<class T, int N>
void array(T (&param)[N])
  cout << "N= " << N << endl;
int main()
  int i[100];
  double d[20];
  char c[6];
  return 0;

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