You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: hstring.rs
    path of file: ./repos/windows-rs/crates/libs/core/src/strings
    
    the code of the file until where you have to start completion: use super::*;

/// A WinRT string ([HSTRING](https://d
    
    fn drop(&mut self) {
        if self.is_empty() {
            return;
        }

        if let Some(header) = self.0.take() {
            // REFERENCE_FLAG indicates a string backed by static or stack memory that is
            // thus not reference-counted and does not need to be freed.
            unsafe {
                let header = header.as_ref();
                if header.flags & REFERENCE_FLAG == 0 && header.count.release() == 0 {
                    imp::heap_free(header as *const _ as *mut _);
                }
            }
        }
    }