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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需满足 https://en.cppreference.com/w/cpp/named_req/ForwardIterator[LegacyForwardIterator^] (遗留向前迭代器^] 要求（{cpp}11 to至 {cpp}17), or satisfies），或满足 https://en.cppreference.com/w/cpp/iterator/forward_iterator[`std::forward_iterator`^] (要求（{cpp}20 and later). For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是有效的成员 typedef。在后一种情况下，库假定 `Hash` 可同时以 `K` and和 `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.调用，且 `Pred` 是透明的。该机制支持异构查找，从而避免实例化 `Key` 类型的开销。返回：被访问的元素数量。</fwditerator>
06/05/2026
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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:;; `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.
06/05/2026

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