Boost Unordered Translation (zh_Hans)/Doc / Modules / Root / Pages / Reference / Concurrent Node Set (adoc)

Exit Zen

173 :787

	English ```c++ template<class FwdIterator, class F> size_t visit(FwdIterator first, FwdIterator last, F f); template<class FwdIterator, class F> size_t visit(FwdIterator first, FwdIterator last, F f) const; template<class FwdIterator, class F> size_t cvisit(FwdIterator first, FwdIterator last, F f) const; ``` 302/10000 · 302
174 :796

	English For each element `k` in the range [`first`, `last`), if there is an element `x` in the container with key equivalent to `k`, invokes `f` with a const reference to `x`. 167/10000 · 167
175 :800

	English Although functionally equivalent to individually invoking xref:concurrent_node_set_cvisit[`[c\]visit`] for each key, bulk visitation performs generally faster due to internal streamlining optimizations. It is advisable that `std::distance(first,last)` be at least xref:#concurrent_node_set_constants[`bulk_visit_size`] to enjoy a performance gain: beyond this size, performance is not expected to increase further. 414/10000 · 414
176 :809

	English Requires:;; `FwdIterator` is a https://en.cppreference.com/w/cpp/named_req/ForwardIterator[LegacyForwardIterator^] ({cpp}11 to {cpp}17), or satisfies https://en.cppreference.com/w/cpp/iterator/forward_iterator[std::forward_iterator^] ({cpp}20 and later). For `K` = `std::iterator_traits<FwdIterator>::value_type`, either `K` is `key_type` or else `Hash::is_transparent` and `Pred::is_transparent` are valid member typedefs. In the latter case, 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. Returns:;; The number of elements visited. 690/10000 · 690
:818 :818

	English --- 3/10000 · 3
178 :820

	English [c]visit_all 12/10000 · 12
179 :822

	English ```c++ template<class F> size_t visit_all(F f); template<class F> size_t visit_all(F f) const; template<class F> size_t cvisit_all(F f) const; ``` 146/10000 · 146
180 :828

	English Successively invokes `f` with const references to each of the elements in the table. 84/10000 · 84
181 :831

	English Returns:;; The number of elements visited. 42/10000 · 42
:833 :833

	English --- 3/10000 · 3
183 :835

	English Parallel [c]visit_all 21/10000 · 21
184 :837

	English ```c++ template<class ExecutionPolicy, class F> void visit_all(ExecutionPolicy&& policy, F f); template<class ExecutionPolicy, class F> void visit_all(ExecutionPolicy&& policy, F f) const; template<class ExecutionPolicy, class F> void cvisit_all(ExecutionPolicy&& policy, F f) const; ``` 287/10000 · 287
185 :843

	English Invokes `f` with const references to each of the elements in the table. Execution is parallelized according to the semantics of the execution policy specified. 159/10000 · 159
186 :847

	English Throws:;; Depending on the exception handling mechanism of the execution policy used, may call `std::terminate` if an exception is thrown within `f`. Notes:;; Only available in compilers supporting C++17 parallel algorithms. + + These overloads only participate in overload resolution if `std::is_execution_policy_v<std::remove_cvref_t<ExecutionPolicy>>` is `true`. + + Unsequenced execution policies are not allowed. 417/10000 · 417
:854 :854

	English --- 3/10000 · 3
188 :856

	English [c]visit_while 14/10000 · 14
189 :858

	English ```c++ template<class F> bool visit_while(F f); template<class F> bool visit_while(F f) const; template<class F> bool cvisit_while(F f) const; ``` 146/10000 · 146
190 :864

	English Successively invokes `f` with const references to each of the elements in the table until `f` returns `false` or all the elements are visited. 142/10000 · 142
191 :868

	English Returns:;; `false` iff `f` ever returns `false`. 48/10000 · 48
:870 :870

	English --- 3/10000 · 3

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