How to Use Range-Based for-Loops on Arrays Passed to Non-main Functions in C ?

Range-based for-loop on Array Passed to Non-main Function

When assigning an array to a pointer in a function call, the compiler infers the pointer type and loses crucial information: the array size. This discrepancy triggers errors when attempting to perform range-based for-loops within the function.

To address this issue, one solution is to utilize an array reference instead of a pointer. By doing so, the function retains knowledge of the array's size:

<code class="cpp">void foo(int (&amp;bar)[3]);

int main() {
  int bar[3] = {1, 2, 3};
  for (int i : bar) {
    cout << i << endl;
  }
  foo(bar);
}

void foo(int (&amp;bar)[3]) {
  for (int i : bar) {
    cout << i << endl;
  }
}

Alternatively, a generic approach can be employed by introducing a template parameter representing the array size:

<code class="cpp">template <std::size_t array_size>
void foo(int (&amp;bar)[array_size]) {
  for (int i : bar) {
    cout << i << endl;
  }
}</code>

By leveraging these techniques, it becomes possible to successfully execute range-based for-loops on arrays passed to non-main functions.

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