c++ - 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 ‘int foo()’, declared with attribute nodiscard [-Werror=unused-result]

but if

int x = foo ();

then

error: unused variable ‘x’ [-Werror=unused-variable]

Is there a clean way of telling the compiler "I want to discard this [[nodiscard]] value"?

Answer 1

Cast it to void:

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

int main ()
{
    static_cast<void>(foo());
}

This basically tells the compiler "Yes I know I'm discarding this, yes I'm sure of it."