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

public member type

<unordered_set>

key_equal key_eq() const;

Get key equivalence predicate

The key equivalence comparison is a predicate that takes the value of two elements as arguments and returns a bool value indicating whether they are to be considered equivalent. It is adopted by the container on construction (see unordered_set's constructor for more info). By default, it is equal_to<key_type>, which returns the same as applying the equal-to operator (==) to the arguments.

Member type key_equal is the type of the key equality comparison predicate used by the container, defined in unordered_set as an alias of its third template parameter (Pred).

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// unordered_set::key_eq
#include <iostream>
#include <string>
#include <unordered_set>

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

  bool case_insensitive = myset.key_eq()("checking","CHECKING");

  std::cout << "myset.key_eq() is ";
  std::cout << ( case_insensitive ? "case insensitive" : "case sensitive" );
  std::cout << std::endl;

  return 0;
}

myset.key_eq() is case sensitive

unordered_set::hash_function

Get hash function (public member type)

unordered_set::get_allocator

Get allocator (public member function)

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