Using std::size

I have found that many still have issue using std::size() general template function.

As mentioned on C++ reference, std::size was implemented in C++17.

Now, the difference comes with the compiler used when using the said implementation.

Assume following example.

#include <iostream>
int main()
    int numbers[] = {10, 20, 30, 40, 50};
    std::cout << std::size(numbers);
    return 0;

The example works on C++17 (GCC) and newer versions (C++20)).

But it does not work on C++17 (Clang) or older versions of GCC (C++14).

So know the compiler that you are using.

Change compiler in Visual Studio
Change compiler in CLion
Change compiler in Code::Blocks
Change compiler in Visual Studio Code