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```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; ```
```c++ template<class Ff=""> bool visit_while(F f); template<class Ff=""> bool visit_while(F f) const; template<class Ff=""> bool cvisit_while(F f) const; ```</class></class></class>
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[c]visit_while
[c]visit_while
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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.
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 抛出异常：;; 根据所使用执行策略的异常处理机制，若 `f` 内部抛出异常，则可能调用 `std::terminate`。
注意：;; 仅在支持 C++17 并行算法的编译器中可用。
仅当`std::is_execution_policy_v<std::remove_cvref_t<EexecutionPpolicy>>` is `true`. + + Unsequenced &gt;` 为 `true` 时，这些重载版本才参与重载决议。
不允许使用无顺序执行策略。</std::remove_cvref_t<execution policies are not allowed.y>
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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.
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.以表中每个元素的常量引用调用 `f`。执行过程会根据指定执行策略的语义进行并行化。
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```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; ```
```c++ template<class EexecutionPpolicy,="" class F="" f=""> void visit_all(ExecutionPolicy&&amp;&amp; policy, F f); template<class EexecutionPpolicy,="" class F="" f=""> void visit_all(ExecutionPolicy&&amp;&amp; policy, F f) const; template<class EexecutionPpolicy,="" class F="" f=""> void cvisit_all(ExecutionPolicy&&amp;&amp; policy, F f) const; ```</class></class></class>
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Parallel [c]visit_all
Parallel [c]visit_并行 ++[++c++]++visit++_++all
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Returns:;; The number of elements visited.
Returns:;; The number of elements visited.返回值：;; 被访问的元素数量。
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Successively invokes `f` with const references to each of the elements in the table.
Successively invokes `f` with const references to each of the elements in the table.依次以表中每个元素的常量引用调用 `f`。
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```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; ```
```c++ template<class Ff=""> size_t visit_all(F f); template<class Ff=""> size_t visit_all(F f) const; template<class Ff=""> size_t cvisit_all(F f) const; ```</class></class></class>
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[c]visit_all
[c]visit_all
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---
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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.
Requires:要求：;; `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是传统前向迭代器（C++11 至 C++17），或满足 `std::forward_iterator` 概念（C++20 及更高版本）。对于 `K` = `std::iterator_traits<FwdIfwditerator>::value_type`, either，要么 `K` is是 `key_type` or else，要么 `Hash::is_transparent` and和 `Pred::is_transparent` are valid member typedefs. In the latter case, the library assumes that `Hash` is callable with both是合法的成员别名。在后一种情况下，库假定 `Hash` 可同时接收 `K` and与 `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.类型调用，且 `Pred` 是透明的。这支持异构查找，避免了实例化 `Key` 类型对象的开销。返回值：;; 被访问的元素数量。</fwditerator>
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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.
Although functionally equivalent to individually invoking xref:concurrent_node_set_cvisit[尽管功能上等同于对每个键单独调用 `[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.，但批量访问因内部优化通常性能更高。建议 `std::distance(first,last)` 至少达到 `bulk_visit_size` 以获得性能提升；超过该大小后，性能预计不会进一步提升。
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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`.
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`.对范围 ++[++`first`, `last`) 内的每个元素 `k` ，若容器中存在键等价于 `k` 的元素 `x` ，则使用指向 `x` 的常量引用调用 `f` 。
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```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; ```
```c++ template<class FwdIfwditerator,="" class F="" f=""> size_t visit(FwdIterator first, FwdIterator last, F f); template<class FwdIfwditerator,="" class F="" f=""> size_t visit(FwdIterator first, FwdIterator last, F f) const; template<class FwdIfwditerator,="" class F="" f=""> size_t cvisit(FwdIterator first, FwdIterator last, F f) const; ```</class></class></class>
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Bulk visit
Bulk visit批量访问
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---
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Returns:;; The number of elements visited (0 or 1). Notes:;; The `template<class K, class F>` 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.
Returns:;; The number of elements visited (0 or 1). Notes:;; The `template<class K, class F>` overloads only participate in overload resolution if返回值：;; 访问过的元素数量（0 或 1）。
注意：;; 仅当 `Hash::is_transparent` and与 `Pred::is_transparent` are valid member typedefs. The library assumes that `Hash` is callable with both为合法成员别名时，`template<class k,="" class="" f="">` 重载版本才会参与重载决议。库假定 `Hash` 可同时用于 `K` and与 `Key` and that `Pred` is transparent. This enables heterogeneous lookup which avoids the cost of instantiating an instance of the `Key` type.类型，且 `Pred` 是透明的。这支持异构查找，避免了实例化 `Key` 类型对象的开销。</class>
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