std::unordered_map::count

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

key.

key

key.

Amortized constant on average, worst case linear in the size of the container.

find (C++11)	(public -) []
equal_range (C++11)	, (public -) []



unordered_map::unordered_map
unordered_map::~unordered_map
unordered_map::operator=
unordered_map::get_allocator

unordered_map::beginunordered_map::cbegin
unordered_map::endunordered_map::cend

unordered_map::empty
unordered_map::size
unordered_map::max_size

unordered_map::clear
unordered_map::insert
unordered_map::insert_range (C++23)
unordered_map::insert_or_assign (C++17)
unordered_map::emplace
unordered_map::emplace_hint
unordered_map::try_emplace (C++17)
unordered_map::erase
unordered_map::swap
unordered_map::extract (C++17)
unordered_map::merge (C++17)

unordered_map::at
unordered_map::operator[]
unordered_map::count
unordered_map::find
unordered_map::contains (C++20)
unordered_map::equal_range

unordered_map::begin(size_type)unordered_map::cbegin(size_type)
unordered_map::end(size_type)unordered_map::cend(size_type)
unordered_map::bucket_count
unordered_map::max_bucket_count
unordered_map::bucket_size
unordered_map::bucket

unordered_map::load_factor
unordered_map::max_load_factor
unordered_map::rehash
unordered_map::reserve

unordered_map::hash_function
unordered_map::key_eq
,
operator==operator!= ( C++20)
std::swap
erase_if (C++20)
(C++17)