How to Handle std::arrays of Variable Size in Functions: A Straightforward Approach?

Passing an std::array of Unknown Size to a Function

Problem:

How to create a function that operates on an std::array of known type but variable size?

Example:

<code class="cpp">// hypothetical example
void mulArray(std::array<int, ?>& arr, const int multiplier) {
    for(auto& e : arr) {
        e *= multiplier;
    }
}</code>

<code class="cpp">// imaginary arrays with values
std::array<int, 17> arr1;
std::array<int, 6> arr2;
std::array<int, 95> arr3;

mulArray(arr1, 3);
mulArray(arr2, 5);
mulArray(arr3, 2);</code>

Question:

Is there a straightforward approach to make this work, similar to C-style arrays?

Answer:

Unfortunately, no. Passing std::arrays of unknown size necessitates using function templates or alternative containers like std::vectors.

Template Solution:

<code class="cpp">template<std::size_t SIZE>
void mulArray(std::array<int, SIZE>& arr, const int multiplier) {
    for(auto& e : arr) {
        e *= multiplier;
    }
}</code>

Live Example: https://godbolt.org/z/T1d1n3vrM

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