How to Use Range-Based For-Loops with Arrays Passed to Non-Main Functions in C ?

Range-Based for-Loop on Array Passed to Non-Main Function

When passing an array as an argument to a non-main function, range-based for-loops may fail due to loss of size information. Here's how to resolve this issue:

In the provided code, when passing bar to foo, it decays into a pointer, losing its size. To preserve the array size, we can pass it by reference using an array reference type:

<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, we can use a generic approach with a template function that automatically accepts arrays of any size:

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

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

By preserving the array size information, range-based for-loops can be used successfully when passing arrays to functions.

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