std::map::value_compare value_comp() const;

(1)

template< class... Args > void emplace_front( Args&&

reference at( size_type pos );

allocator_type get_allocator() const;

size_type count( const Key& key ) const; (1)

bool empty() const;

key_compare key_comp() const;

void rehash( size_type count );

size_type bucket_count() const;