How can I intentionally discard a [[nodiscard]] return value?

Question

Say I have

[[nodiscard]] int foo ()
{
    return 0;
}

int main ()
{
    foo ();
}

then

error: ignoring return value of ‘in         


        

Answer 1

You can also tag the returned int with another tag:

[[nodiscard]] int foo ()
{
    return 0;
}

int main ()
{
    [[maybe_unused]] int i = foo ();
}

Could be useful if you have some debug-only code that requires the value.