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#ifndef TEST_HASH_H
#define TEST_HASH_H
#include <cstddef>
#include <type_traits>
template <class C>
class test_hash
: private C
{
int data_;
public:
explicit test_hash(int data = 0) : data_(data) {}
std::size_t
operator()(typename std::add_lvalue_reference<const typename C::argument_type>::type x) const
{return C::operator()(x);}
bool operator==(const test_hash& c) const
{return data_ == c.data_;}
};
#endif
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