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// I, Howard Hinnant, hereby place this code in the public domain.
// Test the reference collapsing rules. Note that there are recent differences
// for how cv-qualifications are applied to reference types. 7.1.3, 14.3.1
// { dg-do compile { target c++11 } }
template <bool> struct sa;
template <> struct sa<true> {};
template <class T, T v>
struct integral_constant
{
static const T value = v;
typedef T value_type;
typedef integral_constant<T, v> type;
};
typedef integral_constant<bool, true> true_type;
typedef integral_constant<bool, false> false_type;
template <class T> struct is_lvalue_reference : public integral_constant<bool, false> {};
template <class T> struct is_lvalue_reference<T&> : public integral_constant<bool, true> {};
template <class T> struct is_rvalue_reference : public integral_constant<bool, false> {};
template <class T> struct is_rvalue_reference<T&&> : public integral_constant<bool, true> {};
template <class T> struct remove_reference {typedef T type;};
template <class T> struct remove_reference<T&> {typedef T type;};
template <class T> struct remove_reference<T&&> {typedef T type;};
template <class T> struct is_const : public integral_constant<bool, false> {};
template <class T> struct is_const<T const> : public integral_constant<bool, true> {};
template <class T> struct is_volatile : public integral_constant<bool, false> {};
template <class T> struct is_volatile<T volatile> : public integral_constant<bool, true> {};
struct A {};
typedef A& Alref;
typedef const A& cAlref;
typedef volatile A& vAlref;
typedef const volatile A& cvAlref;
typedef A&& Arref;
typedef const A&& cArref;
typedef volatile A&& vArref;
typedef const volatile A&& cvArref;
template <class T, bool is_lvalue_ref, bool is_rvalue_ref, bool s_const, bool s_volatile>
void test()
{
sa<is_lvalue_reference<T>::value == is_lvalue_ref> t1;
sa<is_rvalue_reference<T>::value == is_rvalue_ref> t2;
sa<is_const <typename remove_reference<T>::type>::value == s_const> t3;
sa<is_volatile<typename remove_reference<T>::type>::value == s_volatile> t4;
sa<is_const <typename remove_reference<const T>::type>::value == s_const > t5;
sa<is_volatile<typename remove_reference< volatile T>::type>::value == s_volatile> t6;
}
int main()
{
// sanity check
test< A&, true, false, false, false>();
test<const A&, true, false, true, false>();
test< volatile A&, true, false, false, true>();
test<const volatile A&, true, false, true, true>();
test< A&&, false, true, false, false>();
test<const A&&, false, true, true, false>();
test< volatile A&&, false, true, false, true>();
test<const volatile A&&, false, true, true, true>();
// lvalue reference test
// Alref
test< Alref&, true, false, false, false>();
test<const Alref&, true, false, false, false>();
test< volatile Alref&, true, false, false, false>();
test<const volatile Alref&, true, false, false, false>();
// cAlref
test< cAlref&, true, false, true, false>();
test<const cAlref&, true, false, true, false>();
test< volatile cAlref&, true, false, true, false>();
test<const volatile cAlref&, true, false, true, false>();
// vAlref
test< vAlref&, true, false, false, true>();
test<const vAlref&, true, false, false, true>();
test< volatile vAlref&, true, false, false, true>();
test<const volatile vAlref&, true, false, false, true>();
// cvAlref
test< cvAlref&, true, false, true, true>();
test<const cvAlref&, true, false, true, true>();
test< volatile cvAlref&, true, false, true, true>();
test<const volatile cvAlref&, true, false, true, true>();
// Arref
test< Arref&, true, false, false, false>();
test<const Arref&, true, false, false, false>();
test< volatile Arref&, true, false, false, false>();
test<const volatile Arref&, true, false, false, false>();
// cArref
test< cArref&, true, false, true, false>();
test<const cArref&, true, false, true, false>();
test< volatile cArref&, true, false, true, false>();
test<const volatile cArref&, true, false, true, false>();
// vArref
test< vArref&, true, false, false, true>();
test<const vArref&, true, false, false, true>();
test< volatile vArref&, true, false, false, true>();
test<const volatile vArref&, true, false, false, true>();
// vArref
test< cvArref&, true, false, true, true>();
test<const cvArref&, true, false, true, true>();
test< volatile cvArref&, true, false, true, true>();
test<const volatile cvArref&, true, false, true, true>();
// rvalue reference test
// Alref
test< Alref&&, true, false, false, false>();
test<const Alref&&, true, false, false, false>();
test< volatile Alref&&, true, false, false, false>();
test<const volatile Alref&&, true, false, false, false>();
// cAlref
test< cAlref&&, true, false, true, false>();
test<const cAlref&&, true, false, true, false>();
test< volatile cAlref&&, true, false, true, false>();
test<const volatile cAlref&&, true, false, true, false>();
// vAlref
test< vAlref&&, true, false, false, true>();
test<const vAlref&&, true, false, false, true>();
test< volatile vAlref&&, true, false, false, true>();
test<const volatile vAlref&&, true, false, false, true>();
// cvAlref
test< cvAlref&&, true, false, true, true>();
test<const cvAlref&&, true, false, true, true>();
test< volatile cvAlref&&, true, false, true, true>();
test<const volatile cvAlref&&, true, false, true, true>();
// Arref
test< Arref&&, false, true, false, false>();
test<const Arref&&, false, true, false, false>();
test< volatile Arref&&, false, true, false, false>();
test<const volatile Arref&&, false, true, false, false>();
// cArref
test< cArref&&, false, true, true, false>();
test<const cArref&&, false, true, true, false>();
test< volatile cArref&&, false, true, true, false>();
test<const volatile cArref&&, false, true, true, false>();
// vArref
test< vArref&&, false, true, false, true>();
test<const vArref&&, false, true, false, true>();
test< volatile vArref&&, false, true, false, true>();
test<const volatile vArref&&, false, true, false, true>();
// cvArref
test< cvArref&&, false, true, true, true>();
test<const cvArref&&, false, true, true, true>();
test< volatile cvArref&&, false, true, true, true>();
test<const volatile cvArref&&, false, true, true, true>();
return 0;
}
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