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Returns:;; `size()` of the largest possible table.
Returns:;; `size()` of the largest possible table.返回值：;; 哈希表支持的最大元素数量。
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```c++ size_type max_size() const noexcept; ```
```c++ size_type max_size() const noexcept; ```
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max_size
max_size
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---
---
:924
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Notes:;; In the presence of concurrent insertion operations, the value returned may not accurately reflect the true size of the table right after execution.
Notes:;; In the presence of concurrent insertion operations, the value returned may not accurately reflect the true size of the table right after execution.注意：;; 当存在并发插入操作时，返回的值可能无法精确反映函数执行后哈希表的真实大小。
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Returns:;; The number of elements in the table.
Returns:;; The number of elements in the table.返回值：;; 哈希表中的元素数量。
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```c++ size_type size() const noexcept; ```
```c++ size_type size() const noexcept; ```
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size
size大小
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---
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:909
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Returns:;; `size() == 0`
Returns:返回值：;; `size() == 0`
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```c++ [[nodiscard]] bool empty() const noexcept; ```
```c++ [[nodiscard]] bool empty() const noexcept; ```
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empty
empty空
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Size and Capacity
Size and Capacity大小与容量
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---
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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，这些重载版本才参与重载决议。
不允许使用无顺序执行策略。
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` 可能会继续被后续元素调用，且这些调用的返回值同样可能为 `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.以表中每个元素的常量引用调用 `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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---
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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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