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// { dg-options "-Wno-deprecated" }

#include <backward/hashtable.h>

#include <utility>

struct modulo2_hash

{

  size_t operator()(int const key) const

  {

    return key % 2;

  }

};

struct modulo2_eq

{

  bool operator()(int const left, int const right) const

  {

    return left % 2 == right % 2;

  }

};

int main()

{

  typedef std::_Select1st<std::pair<int const, int> > extract_type;

  typedef

    __gnu_cxx::hashtable<std::pair<int const, int>, int, modulo2_hash,

                         extract_type, modulo2_eq, std::allocator<int> >

      table_type;

  table_type table(4, modulo2_hash(), modulo2_eq(), extract_type(),

                   std::allocator<int>());

  table.insert_equal(std::make_pair(2, 1));

  table_type::iterator it(table.insert_equal(std::make_pair(4, 2)));

  table.erase(it->first);

}