std::unordered_multimap<Key,T,Hash,KeyEqual,Allocator>::max_bucket_count

Since C++11

Returns the maximum number of buckets the container is able to hold due to system or library implementation limitations.

# Declarations

size_type max_bucket_count() const;

(since C++11)

# Return value

Maximum number of buckets.

# Example

#include <iostream>
#include <unordered_map>
 
int main()
{
    struct Ha { std::size_t operator()(long x) const { return std::hash<long>{}(x); }; };
 
    auto c1 = std::unordered_multimap<char, long>{};
    auto c2 = std::unordered_multimap<long, long>{};
    auto c3 = std::unordered_multimap<long, long, std::hash<int>>{};
    auto c4 = std::unordered_multimap<long, 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'
        ;
}

# See also

bucket_count