std::unordered_map::count

From Cppreference

C++ Standard Library
Language Utilities library Strings library Containers library Algorithms library Iterators library Numerics library Input/output library Localizations library Regular expressions library (C++11) Atomic operations library (C++11) Thread support library (C++11)
Containers library
array (C++11) vector deque forward_list (C++11) list set multiset map multimap unordered_set (C++11) unordered_multiset (C++11) unordered_map (C++11) unordered_multimap (C++11) stack queue priority_queue
std::unordered_map
Member functions unordered_map::unordered_map unordered_map::~unordered_map unordered_map::operator= unordered_map::get_allocator Iterators unordered_map::begin unordered_map::cbegin unordered_map::end unordered_map::cend Capacity unordered_map::erase unordered_map::size unordered_map::max_size Modifiers unordered_map::clear unordered_map::insert unordered_map::emplace unordered_map::emplace_hint unordered_map::erase unordered_map::swap Lookup unordered_map::count unordered_map::find unordered_map::equal_range Bucket interface unordered_map::begin(int) unordered_map::end(int) unordered_map::bucket_count unordered_map::max_bucket_count unordered_map::bucket_size unordered_map::bucket Hash policy unordered_map::load_factor unordered_map::max_load_factor unordered_map::rehash unordered_map::reserve Observers unordered_map::hash_function unordered_map::key_eq

size_type count( const Key& key ) const;

Returns the number of elements with key key.

Contents 1 Parameters 2 Return value 3 Complexity 4 See also

[edit] Parameters

key

-

key value of the elements to count

[edit] Return value

number of elements with key key

[edit] Complexity

This section is incomplete

[edit] See also

find	finds element with specific key (public member function)
equal_range	returns range of elements matching a specific key (public member function)