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Size and Capacity
Size and Capacity大小与容量
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Returns:;; `false` iff `f` ever returns `false`. 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. + + Parallelization implies that execution does not necessary finish as soon as `f` returns `false`, and as a result `f` may be invoked with further elements for which the return value is also `false`.
Returns:;; `false` iff `f` ever returns `false`. 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返回值：;; 当且仅当 `f` 返回过 `false` 时，返回 `false`。
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 execution policies are not allowed. + + Parallelization implies that execution does not necessary finish as soon as `f` returns `false`, and as a result `f` may be invoked with further elements for which the return value is also `false`.&gt;` 为 `true` 时，这些重载版本才会参与重载决议。
不允许使用无序执行策略。
并行化意味着执行流程不会在 `f` 返回 `false` 时立即终止，因此 `f` 可能还会被后续元素调用并同样返回 `false`。</std::remove_cvref_t<executionpolicy>
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Invokes `f` with const references to each of the elements in the table until `f` returns `false` or all the elements are visited. 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 until `f` returns `false` or all the elements are visited. Execution is parallelized according to the semantics of the execution policy specified.以指向哈希表中每个元素的常量引用调用函数 `f`，直到 `f` 返回 `false` 或遍历完所有元素。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> bool visit_while(ExecutionPolicy&& policy, F f); template<class ExecutionPolicy, class F> bool visit_while(ExecutionPolicy&& policy, F f) const; template<class ExecutionPolicy, class F> bool cvisit_while(ExecutionPolicy&& policy, F f) const; ```
```c++ template<class EexecutionPpolicy,="" class F="" f=""> bool visit_while(ExecutionPolicy&&amp;&amp; policy, F f); template<class EexecutionPpolicy,="" class F="" f=""> bool visit_while(ExecutionPolicy&&amp;&amp; policy, F f) const; template<class EexecutionPpolicy,="" class F="" f=""> bool cvisit_while(ExecutionPolicy&&amp;&amp; policy, F f) const; ```</class></class></class>
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Parallel [c]visit_while
Parallel [c]visit_并行 ++[++c++]++visit++_++while
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Returns:;; `false` iff `f` ever returns `false`.
Returns:;; `false` iff `f` ever returns返回值：;; 当且仅当 `f` 返回过 `false` 时，返回 `false`.。
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Successively invokes `f` with const references to each of the elements in the table until `f` returns `false` or all the elements are visited.
Successively invokes `f` with const references to each of the elements in the table until `f` returns `false` or all the elements are visited.依次以指向哈希表中每个元素的常量引用调用函数 `f`，直到 `f` 返回 `false` 或遍历完所有元素。
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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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---
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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，这些重载版本才会参与重载决议。
不允许使用无序执行策略。</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.以指向哈希表中每个元素的常量引用调用函数 `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并行 [c]visit_all
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---
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Returns:;; The number of elements visited.
Returns:;; The number of elements visited.返回值：;; 访问到的元素总数。
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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.依次以指向哈希表中每个元素的常量引用调用函数 `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>
06/05/2026

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