Boost Unordered Translation (zh_Hans)/Doc / Modules / Root / Pages / Reference / Unordered Map (adoc)

Exit Zen

:998 :998

	English Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. 125/10000 · 125
:1000 :1000

	English Pointers and references to elements are never invalidated. 58/10000 · 58
:1002 :1002

	English The `template<class K, class\... Args>` overload only participates in overload resolution if `Hash::is_transparent` and `Pred::is_transparent` are valid member typedefs and neither `iterator` nor `const_iterator` are implicitly convertible from `K`. 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. -- 456/10000 · 456
:1005 :1005

	English --- 3/10000 · 3
242 :1007

	English try_emplace with Hint 21/10000 · 21
243 :1008

	English ```c++ template<class... Args> iterator try_emplace(const_iterator hint, const key_type& k, Args&&... args); template<class... Args> iterator try_emplace(const_iterator hint, key_type&& k, Args&&... args); template<class K, class... Args> iterator try_emplace(const_iterator hint, K&& k, Args&&... args); ``` 308/10000 · 308
:1017 :1017

	English Inserts a new element into the container if there is no existing element with key `k` contained within it. 106/10000 · 106
:1019 :1019

	English If there is an existing element with key `k` this function does nothing. 72/10000 · 72
:1021 :1021

	English `hint` is a suggestion to where the element should be inserted. 63/10000 · 63
247 :1024

	English Returns:;; If an insert took place, then the iterator points to the newly inserted element. Otherwise, it points to the element with equivalent key. Throws:;; If an exception is thrown by an operation other than a call to `hasher` the function has no effect. Notes:;; This function is similiar to xref:#unordered_map_emplace_hint[emplace_hint] except the `value_type` is constructed using: + + -- ```c++ 403/10000 · 403
:1031 :1031

	English value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<Key>(k)), std::forward_as_tuple(std::forward<Args>(args)...)) 133/10000 · 133
:1036 :1036

	English value_type(std::piecewise_construct, std::forward_as_tuple(std::forward<K>(k)), std::forward_as_tuple(std::forward<Args>(args)...)) ``` 135/10000 · 135
250 :1041

	English instead of xref:#unordered_map_emplace_hint[emplace_hint] which simply forwards all arguments to ``value_type``'s constructor. 126/10000 · 126
251 :1043

	English The standard is fairly vague on the meaning of the hint. But the only practical way to use it, and the only way that Boost.Unordered supports is to point to an existing element with the same key. 195/10000 · 195
:1045 :1045

	English Can invalidate iterators, but only if the insert causes the load factor to be greater to or equal to the maximum load factor. 125/10000 · 125
:1047 :1047

	English Pointers and references to elements are never invalidated. 58/10000 · 58
:1049 :1049

	English The `template<class K, class\... Args>` overload only participates in overload resolution if `Hash::is_transparent` and `Pred::is_transparent` are valid member typedefs and neither `iterator` nor `const_iterator` are implicitly convertible from `K`. 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. -- 456/10000 · 456
:1052 :1052

	English --- 3/10000 · 3
256 :1054

	English insert_or_assign 16/10000 · 16
257 :1055

	English ```c++ template<class M> std::pair<iterator, bool> insert_or_assign(const key_type& k, M&& obj); template<class M> std::pair<iterator, bool> insert_or_assign(key_type&& k, M&& obj); template<class K, class M> std::pair<iterator, bool> insert_or_assign(K&& k, M&& obj); ``` 272/10000 · 272

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