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std::unordered_multiset<Key,Hash,KeyEqual,Allocator>:: max_bucket_count

From cppreference.net

C++
Containers library
std::unordered_multiset
Member types
Member functions
Non-member functions
Deduction guides (C++17)
size_type max_bucket_count ( ) const ;
(自 C++11 起)

返回容器由于系统或库实现限制所能持有的最大桶数。

目录

参数

(无)

返回值

最大桶数。

复杂度

常量。

示例

运行此代码 
#include <iostream>
#include <unordered_set>
int main()
{
    struct Ha { std::size_t operator()(long x) const { return std::hash<long>{}(x); }; };
    auto c1 = std::unordered_multiset<char>{};
    auto c2 = std::unordered_multiset<long>{};
    auto c3 = std::unordered_multiset<long, std::hash<int>>{};
    auto c4 = std::unordered_multiset<long, Ha>{};
    std::cout
        << "Max bucket count of\n" << std::hex << std::showbase
        << "c1: " << c1.max_bucket_count() << '\n'
        << "c2: " << c2.max_bucket_count() << '\n'
        << "c3: " << c3.max_bucket_count() << '\n'
        << "c4: " << c4.max_bucket_count() << '\n'
        ;
}

可能的输出： 

Max bucket count of
c1: 0xfffffffffffffff
c2: 0xfffffffffffffff
c3: 0xfffffffffffffff
c4: 0xaaaaaaaaaaaaaaa

另请参阅

返回桶的数量
(公开成员函数)