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Showing content from https://cplusplus.com/reference/unordered_set/unordered_set/max_size/ below:

public member function

<unordered_set>

size_type max_size() const noexcept;

Return maximum size

This is the maximum potential number of elements the container can hold due to system constraints or limitations on its library implementation.

Member type size_type is an unsigned integral type.

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// unordered_set limits
#include <iostream>
#include <unordered_set>

int main ()
{
  std::unordered_set<int> myset;

  std::cout << "max_size = " << myset.max_size() << std::endl;
  std::cout << "max_bucket_count = " << myset.max_bucket_count() << std::endl;
  std::cout << "max_load_factor = " << myset.max_load_factor() << std::endl;

  return 0;
}

max_size = 536870911
max_bucket_count = 536870911
max_load_factor = 1

unordered_set::empty

Test whether container is empty (public member function)

unordered_set::max_bucket_count

Return maximum number of buckets (public member function)

unordered_set::max_load_factor

Get or set maximum load factor (public member function)

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