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

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463 :1727

	English Swap 4/10000 · 4
464 :1728

	English ```c++ template<class Key, class T, class Hash, class Pred, class Alloc> void swap(unordered_map<Key, T, Hash, Pred, Alloc>& x, unordered_map<Key, T, Hash, Pred, Alloc>& y) noexcept(noexcept(x.swap(y))); ``` 207/10000 · 207
465 :1735

	English Swaps the contents of `x` and `y`. 34/10000 · 34
:1737 :1737

	English If `Allocator::propagate_on_container_swap` is declared and `Allocator::propagate_on_container_swap::value` is `true` then the containers' allocators are swapped. Otherwise, swapping with unequal allocators results in undefined behavior. 237/10000 · 237
467 :1740

	English Effects:;; `x.swap(y)` Throws:;; Doesn't throw an exception unless it is thrown by the copy constructor or copy assignment operator of `key_equal` or `hasher`. Notes:;; The exception specifications aren't quite the same as the C++11 standard, as the equality predicate and hash function are swapped using their copy constructors. 329/10000 · 329
:1744 :1744

	English --- 3/10000 · 3
469 :1746

	English erase_if 8/10000 · 8
470 :1747

	English ```c++ template<class K, class T, class H, class P, class A, class Predicate> typename unordered_map<K, T, H, P, A>::size_type erase_if(unordered_map<K, T, H, P, A>& c, Predicate pred); ``` 189/10000 · 189
471 :1753

	English Traverses the container `c` and removes all elements for which the supplied predicate returns `true`. 101/10000 · 101
472 :1756

	English Returns:;; The number of erased elements. Notes:;; Equivalent to: + + ```c++ auto original_size = c.size(); for (auto i = c.begin(), last = c.end(); i != last; ) { if (pred(*i)) { i = c.erase(i); } else { ++i; } } return original_size - c.size(); ``` + Note that the references passed to `pred` are non-const. 309/10000 · 309
473 :1773

	English Serialization 13/10000 · 13
474 :1775

	English ``unordered_map``s can be archived/retrieved by means of link:../../../../../serialization/index.html[Boost.Serialization^] using the API provided by this library. Both regular and XML archives are supported. 208/10000 · 208
475 :1779

	English Saving an unordered_map to an archive 37/10000 · 37
476 :1781

	English Saves all the elements of an `unordered_map` `x` to an archive (XML archive) `ar`. 82/10000 · 82
477 :1784

	English Requires:;; `std::remove_const<key_type>::type` and `std::remove_const<mapped_type>::type` are serializable (XML serializable), and they do support Boost.Serialization `save_construct_data`/`load_construct_data` protocol (automatically suported by https://en.cppreference.com/w/cpp/named_req/DefaultConstructible[DefaultConstructible^] types). 343/10000 · 343
:1790 :1790

	English --- 3/10000 · 3
479 :1792

	English Loading an unordered_map from an archive 40/10000 · 40
480 :1794

	English Deletes all preexisting elements of an `unordered_map` `x` and inserts from an archive (XML archive) `ar` restored copies of the elements of the original `unordered_map` `other` saved to the storage read by `ar`. 212/10000 · 212
481 :1799

	English Requires:;; `value_type` is https://en.cppreference.com/w/cpp/named_req/EmplaceConstructible[EmplaceConstructible^] from `(std::remove_const<key_type>::type&&, std::remove_const<mapped_type>::type&&)`. `x.key_equal()` is functionally equivalent to `other.key_equal()`. Note:;; If the archive was saved using a release of Boost prior to Boost 1.84, the configuration macro `BOOST_UNORDERED_ENABLE_SERIALIZATION_COMPATIBILITY_V0` has to be globally defined for this operation to succeed; otherwise, an exception is thrown. 520/10000 · 520
:1806 :1806

	English --- 3/10000 · 3

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