Hash Quality (adoc)

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8 :45
	English By setting the `link:../../../../container_hash/doc/html/hash.html#ref_hash_is_avalanchinghash[hash_is_avalanching]` trait, we inform Boost.Unordered that `my_string_hash_function` is of sufficient quality to be used directly without any post-mixing safety net. This comes at the risk of degraded performance in the cases where the hash function is not as well-behaved as we've declared.
	Chinese (Simplified Han script) 通过设置 link:../../../../container_hash/doc/html/hash.html#ref_hash_is_avalanchinghash[`hash++_++is++_++avalanching`] 特征，我们告知Boost.Unordered： `my++_++string++_++hash++_++function` 具有足够高的质量，无需任何后混合处理安全网即可直接使用。但这样做的风险在于，如果哈希函数的表现未达到我们声明的理想状态，则可能导致性能下降。 247/3870 · 387 Needs editing
9 :52
	English Container Statistics
	Chinese (Simplified Han script) 容器统计信息 6/200 · 20 Needs editing
10 :54
	English If we globally define the macro `BOOST_UNORDERED_ENABLE_STATS`, open-addressing and concurrent containers will calculate some internal statistics directly correlated to the quality of the hash function:
	Chinese (Simplified Han script) 若在全局定义宏 `BOOST++_++UNORDERED++_++ENABLE++_++STATS` ，开放寻址容器与并发容器将计算与哈希函数质量直接相关的内部统计信息： 85/2020 · 202 Needs editing
11 :75
	English The `stats` object provides the following information:
	Chinese (Simplified Han script) `stats` 对象提供以下统计信息： 19/540 · 54 Needs editing
12 :108
	English Statistics for three internal operations are maintained: insertions (without considering the previous lookup to determine that the key is not present yet), successful lookups, and unsuccessful lookups (including those issued internally when inserting elements). _Probe length_ is the number of xref:structures.adoc#structures_open_addressing_containers[bucket groups] accessed per operation. If the hash function behaves properly:
	Chinese (Simplified Han script) 系统维护三类内部操作的统计信息：插入操作（不考虑先前查找键是否存在的操作）、成功查找及未命中查找（包括插入元素时触发的内部查询）。__探测长度__是指每次操作所访问的 xref:structures.adoc#structures_open_addressing_containers[桶组] 数量。若哈希函数表现正常： 160/4310 · 431 Needs editing
13 :115
	English Average probe lengths should be close to 1.0.
	Chinese (Simplified Han script) 平均探测长度应接近1.0。 13/450 · 45 Needs editing
14 :116
	English The average number of comparisons per successful lookup should be close to 1.0 (that is,
	Chinese (Simplified Han script) 每次成功查找的平均比较次数应接近 1.0（即， 23/880 · 88 Needs editing
15 :117
	English just the element found is checked).
	Chinese (Simplified Han script) 仅检查找到的那个元素）。 12/350 · 35 Needs editing
16 :118
	English The average number of comparisons per unsuccessful lookup should be close to 0.0.
	Chinese (Simplified Han script) 每次失败查找的平均比较次数应接近 0.0。 21/810 · 81 Needs editing
17 :120
	English An link:../../../benchmark/string_stats.cpp[example^] is provided that displays container statistics for `boost::hash<std::string>`, an implementation of the https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function#FNV-1a_hash[FNV-1a hash^] and two ill-behaved custom hash functions that have been incorrectly marked as avalanching:
	Chinese (Simplified Han script) 提供了一个链接：../../../benchmark/string_stats.cpp[示例^]，用于展示 `boost::hash<std::string>`、https://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function#FNV-1a_hash[FNV-1a 哈希^] 以及两种行为不当但被错误标记为具有雪崩效应的自定义哈希函数的容器统计信息。</std::string> 231/3500 · 350 Needs editing
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