Method count

src/core/include/megbrain/utils/thin/hash_table.h:585–585

-------------- lookup -------------- */

    /* -------------- lookup --------------  */
    size_t count(const Key& key) const { return find(key) != m_impl.impl().end(); }

    const_iterator find(const Key& key) const {
        return m_impl.find(make_impl_key(key));