#include <functional>
#include <type_traits>
class C {};
int main()
{
static_assert((std::is_same<std::reference_wrapper<C>::type,
C>::value), "");
static_assert((std::is_same<std::reference_wrapper<void ()>::type,
void ()>::value), "");
static_assert((std::is_same<std::reference_wrapper<int* (double*)>::type,
int* (double*)>::value), "");
static_assert((std::is_same<std::reference_wrapper<void(*)()>::type,
void(*)()>::value), "");
static_assert((std::is_same<std::reference_wrapper<int*(*)(double*)>::type,
int*(*)(double*)>::value), "");
static_assert((std::is_same<std::reference_wrapper<int*(C::*)(double*)>::type,
int*(C::*)(double*)>::value), "");
static_assert((std::is_same<std::reference_wrapper<int (C::*)(double*) const volatile>::type,
int (C::*)(double*) const volatile>::value), "");
}