User avatar admin

Translation uploaded
Returns the container's key equality function..
Returns the container's key equality function..返回容器的键相等性函数。
06/05/2026
User avatar admin

Translation uploaded
`key_equal key_eq() const`
`key_equal key_eq() const`
06/05/2026
User avatar admin

Translation uploaded
Returns the container's hash function.
Returns the container's hash function.返回容器的哈希函数。
06/05/2026
User avatar admin

Translation uploaded
`hasher hash_function() const`
`hasher hash_function() const`
06/05/2026
User avatar admin

Translation uploaded
Description
Description描述
06/05/2026
User avatar admin

Translation uploaded
Method
Method方法
06/05/2026
User avatar admin

Translation uploaded
See the link:../../../../container_hash/index.html[Boost.Hash documentation^] for more detail on how to do this. Remember that it relies on extensions to the standard - so it won't work for other implementations of the unordered associative containers, you'll need to explicitly use Boost.Hash.
See the有关如何执行此操作的更多详细信息，请参阅 link:../../../../container_hash/index.html[Boost.Hash documentation^] for more detail on how to do this. Remember that it relies on extensions to the standard - so it won't work for other implementations of the unordered associative containers, you'll need to explicitly use文档^]。请记住，它依赖于标准扩展—因此它不适用于无序关联容器的其他实现，你需要显式使用 Boost.Hash.。
06/05/2026
User avatar admin

Translation uploaded
boost::unordered_multiset<point> points; ```
boost::unordered_multiset<point> points; ```</point>
06/05/2026
User avatar admin

Translation uploaded
std::size_t hash_value(point const& p) { std::size_t seed = 0; boost::hash_combine(seed, p.x); boost::hash_combine(seed, p.y); return seed; }
std::size_t hash_value(point const&amp; p) { std::size_t seed = 0; boost::hash_combine(seed, p.x); boost::hash_combine(seed, p.y); return seed; }
06/05/2026
User avatar admin

Translation uploaded
bool operator==(point const& p1, point const& p2) { return p1.x == p2.x && p1.y == p2.y; }
bool operator==(point const&amp; p1, point const&amp; p2) { return p1.x == p2.x &&amp;&amp; p1.y == p2.y; }
:117
06/05/2026
User avatar admin

Translation uploaded
```cpp struct point { int x; int y; };
```cpp struct point { int x; int y; };
:111
06/05/2026
User avatar admin

Translation uploaded
Since the default hash function is link:../../../../container_hash/index.html[Boost.Hash^], we can extend it to support the type so that the hash function doesn't need to be explicitly given:
Since the default hash function is由于默认哈希函数是 link:../../../../container_hash/index.html[Boost.Hash^], we can extend it to support the type so that the hash function doesn't need to be explicitly given:，我们可以扩展它以支持该类型，从而无需显式给出哈希函数：
06/05/2026
User avatar admin

Translation uploaded
boost::unordered_multiset<point, point_hash> points; ```
boost::unordered_multiset<point, point_hash=""> points; ```</point,>
06/05/2026
User avatar admin

Translation uploaded
struct point_hash { std::size_t operator()(point const& p) const { std::size_t seed = 0; boost::hash_combine(seed, p.x); boost::hash_combine(seed, p.y); return seed; } };
struct point_hash { std::size_t operator()(point const&amp; p) const { std::size_t seed = 0; boost::hash_combine(seed, p.x); boost::hash_combine(seed, p.y); return seed; } };
06/05/2026
User avatar admin

Translation uploaded
bool operator==(point const& p1, point const& p2) { return p1.x == p2.x && p1.y == p2.y; }
bool operator==(point const&amp; p1, point const&amp; p2) { return p1.x == p2.x &&amp;&amp; p1.y == p2.y; }
:89
06/05/2026
User avatar admin

Translation uploaded
```cpp struct point { int x; int y; };
```cpp struct point { int x; int y; };
:83
06/05/2026
User avatar admin

Translation uploaded
Similarly, a custom hash function can be used for custom types:
Similarly, a custom hash function can be used for custom types:类似地，自定义类型也可使用自定义哈希函数：
06/05/2026
User avatar admin

Translation uploaded
Custom Types
Custom Types自定义类型
06/05/2026
User avatar admin

Translation uploaded
predicates, especially if you're using a function pointer. If you compare two containers with different equality predicates then the result is undefined. For most stateless function objects this is impossible - since you can only compare objects with the same equality predicate you know the equality predicates must be equal. But if you're using function pointers or a stateful equality predicate (e.g. `boost::function`) then you can get into trouble.
predicates, especially if you're using a function pointer. If you compare two containers with different equality predicates then the result is undefined. For most stateless function objects this is impossible - since you can only compare objects with the same equality predicate you know the equality predicates must be equal. But if you're using function pointers or a stateful equality predicate (e.g. `boost::function`) then you can get into trouble.在使用自定义相等谓词（特别是函数指针）时请务必小心。如果你用不同的相等谓词比较两个容器，结果是未定义的。对于大多数无状态函数对象而言，这种情况不可能发生——因为你只能使用相同的相等谓词来比较对象，所以两个相等谓词必然相等。但如果你使用的是函数指针或有状态的相等谓词（例如 boost::function），则可能会遇到问题。
06/05/2026
User avatar admin

Translation uploaded
Be careful when using the equality (`==`) operator with custom equality
Be careful when using the equality (`==`) operator with custom equality在使用自定义相等谓词时，请谨慎使用相等（==）运算符
06/05/2026

Search