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#[macro_export]
macro_rules! slice_raw_ptr_or_null {
    ($t:expr) => {
        if $t.len() == 0 {
            ::std::ptr::null()
        } else {
            &$t[0] as *const _
        }
    }
}

#[macro_export]
macro_rules! slice_raw_ptr_or_null_mut {
    ($t:expr) => {
        if $t.len() == 0 {
            ::std::ptr::null_mut()
        } else {
            &mut $t[0] as *mut _
        }
    }
}