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378 :1463

	English operator++[++++]++ 18/10000 · 18
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	English ```c++ mapped_type& operator[](const key_type& k); mapped_type& operator[](key_type&& k); template<class K> mapped_type& operator[](K&& k); ``` 143/10000 · 143
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	English Effects:;; If the container does not already contain an elements with a key equivalent to `k`, inserts the value `std::pair<key_type const, mapped_type>(k, mapped_type())`. Returns:;; A reference to `x.second` where `x` is the element already in the container, or the newly inserted element with a key equivalent to `k`. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. + + Pointers and references to elements are never invalidated. + + The `template<class K>` overload only participates in overload resolution if `Hash::is_transparent` and `Pred::is_transparent` are valid member typedefs. The library assumes that `Hash` is callable with both `K` and `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type. 990/10000 · 990
:1480 :1480

	English --- 3/10000 · 3
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	English at 2/10000 · 2
383 :1483

	English ```c++ mapped_type& at(const key_type& k); const mapped_type& at(const key_type& k) const; template<class K> mapped_type& at(const K& k); template<class K> const mapped_type& at(const K& k) const; ``` 200/10000 · 200
384 :1491

	English Returns:;; A reference to `x.second` where `x` is the (unique) element whose key is equivalent to `k`. Throws:;; An exception object of type `std::out_of_range` if no such element is present. Notes:;; The `template<class K>` overloads only participate in overload resolution if `Hash::is_transparent` and `Pred::is_transparent` are valid member typedefs. The library assumes that `Hash` is callable with both `K` and `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type. 558/10000 · 558
:1495 :1495

	English --- 3/10000 · 3
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	English Bucket Interface 16/10000 · 16
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	English bucket_count 12/10000 · 12
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	English ```c++ size_type bucket_count() const noexcept; ``` 51/10000 · 51
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	English Returns:;; The number of buckets. 33/10000 · 33
:1507 :1507

	English --- 3/10000 · 3
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	English max_bucket_count 16/10000 · 16
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	English ```c++ size_type max_bucket_count() const noexcept; ``` 55/10000 · 55
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	English Returns:;; An upper bound on the number of buckets. 51/10000 · 51
:1517 :1517

	English --- 3/10000 · 3
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	English bucket_size 11/10000 · 11
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	English ```c++ size_type bucket_size(size_type n) const; ``` 52/10000 · 52
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	English Requires:;; `n < bucket_count()` Returns:;; The number of elements in bucket `n`. 81/10000 · 81

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