Lookup#

All methods in this section can be executed concurrently with each other, concurrently-safe modifiers and while traversing the container.

count#

size_type count( const key_type& key );

Returns: the number of elements equivalent to key.

template <typename K>
size_type count( const K& key );

Returns: the number of elements that is equivalent to key.

This overload only participates in overload resolution if qualified-id hasher::transparent_key_equal is valid and denotes a type.

find#

iterator find( const key_type& key );

const_iterator find( const key_type& key ) const;

Returns: an iterator to the element equivalent to key, or end() if no such element exists.

template <typename K>
iterator find( const K& key );

template <typename K>
const_iterator find( const K& key ) const;

Returns: an iterator to the element that is equivalent to key, or end() if no such element exists.

These overloads only participates in overload resolution if qualified-id hasher::transparent_key_equal is valid and denotes a type.

contains#

bool contains( const key_type& key ) const;

Returns: true if an element equivalent to key exists in the container; false, otherwise.

template <typename K>
bool contains( const K& key ) const;

Returns: true if an element equivalent to key exists in the container; false, otherwise.

This overload only participates in overload resolution if qualified-id hasher::transparent_key_equal is valid and denotes a type.

equal_range#

std::pair<iterator, iterator> equal_range( const key_type& key );

std::pair<const_iterator, const_iterator> equal_range( const key_type& key ) const;

Returns: if an element equivalent to key exists, a pair of iterators {f, l}, where f is an iterator to this element, l is std::next(f). Otherwise, {end(), end()}.

template <typename K>
std::pair<iterator, iterator> equal_range( const K& key )

template <typename K>
std::pair<const_iterator, const_iterator> equal_range( const K& key )

Returns: if an element equivalent to key exists, a pair of iterators {f, l}, where f is an iterator to this element, l is std::next(f). Otherwise, {end(), end()}.

These overloads participate in overload resolution only if qualified-id hasher::transparent_key_equal is valid and denotes a type.