1 #ifndef TEST_HASH_H 2 #define TEST_HASH_H 3 4 #include <cstddef> 5 #include <type_traits> 6 7 template <class C> 8 class test_hash 9 : private C 10 { 11 int data_; 12 public: 13 explicit test_hash(int data = 0) : data_(data) {} 14 15 std::size_t 16 operator()(typename std::add_lvalue_reference<const typename C::argument_type>::type x) const 17 {return C::operator()(x);} 18 19 bool operator==(const test_hash& c) const 20 {return data_ == c.data_;} 21 }; 22 23 #endif // TEST_HASH_H 24
