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Diffstat (limited to 'gcc/testsuite/g++.dg/cpp0x/reference_collapsing.C')
| -rw-r--r-- | gcc/testsuite/g++.dg/cpp0x/reference_collapsing.C | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/cpp0x/reference_collapsing.C b/gcc/testsuite/g++.dg/cpp0x/reference_collapsing.C new file mode 100644 index 000000000..5b682e304 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp0x/reference_collapsing.C @@ -0,0 +1,175 @@ +// 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 } +// { dg-options "-std=c++0x" } + +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; +} |