libstdc++-v3/testsuite/backward/hash_set/49060.cc

   1 // { dg-options "-Wno-deprecated" }
   2
   3 #include <backward/hashtable.h>
   4 #include <utility>
   5
   6 struct modulo2_hash
   7 {
   8   size_t operator()(int const key) const
   9   {
  10     return key % 2;
  11   }
  12 };
  13
  14 struct modulo2_eq
  15 {
  16   bool operator()(int const left, int const right) const
  17   {
  18     return left % 2 == right % 2;
  19   }
  20 };
  21
  22 int main()
  23 {
  24   typedef std::_Select1st<std::pair<int const, int> > extract_type;
  25   typedef
  26     __gnu_cxx::hashtable<std::pair<int const, int>, int, modulo2_hash,
  27                          extract_type, modulo2_eq, std::allocator<int> >
  28       table_type;
  29   table_type table(4, modulo2_hash(), modulo2_eq(), extract_type(),
  30                    std::allocator<int>());
  31
  32   table.insert_equal(std::make_pair(2, 1));
  33   table_type::iterator it(table.insert_equal(std::make_pair(4, 2)));
  34   table.erase(it->first);
  35 }