Portable UNUSED parameter macro used on function signature for C and C++

The way I do it is like this:

#define UNUSED(x) (void)(x)
void foo(const int i) {

I’ve not had a problem with that in Visual Studio, Intel, gcc and clang.

The other option is to just comment out the parameter:

void foo(const int /*i*/) {
  // When we need to use `i` we can just uncomment it.

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