aboutsummaryrefslogtreecommitdiff
path: root/gcc
diff options
context:
space:
mode:
Diffstat (limited to 'gcc')
-rw-r--r--gcc/testsuite/g++.dg/cpp0x/variadic-alias8.C95
1 files changed, 95 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/cpp0x/variadic-alias8.C b/gcc/testsuite/g++.dg/cpp0x/variadic-alias8.C
new file mode 100644
index 0000000..1d317ef
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/variadic-alias8.C
@@ -0,0 +1,95 @@
+// PR c++/101071
+// { dg-do compile { target c++11 } }
+// { dg-additional-options "-fno-elide-constructors -O2" }
+
+// Like variadic-alias2.C, just different options.
+
+template<class...>
+struct list {};
+
+struct nil;
+
+////////////////////////////////////////////////////////////////////////////////
+
+template<int n>
+struct number {
+ constexpr /*implicit*/ operator int() const { return n; }
+ using type = number<n>;
+};
+
+using false_ = number<0>;
+using true_ = number<1>;
+
+static_assert(!false_{}, "");
+static_assert(true_{}, "");
+
+template<int... ns> using numbers = list<number<ns>...>;
+
+////////////////////////////////////////////////////////////////////////////////
+
+template<class lhs, class rhs>
+struct less_impl;
+
+template<int lhs, int rhs>
+struct less_impl<number<lhs>, number<rhs>>
+ : number<(lhs < rhs)> {};
+
+template<class lhs, class rhs> using less = typename less_impl<lhs, rhs>::type;
+
+////////////////////////////////////////////////////////////////////////////////
+
+template<class v0, class... vs>
+struct sum_impl {
+ static_assert(sizeof...(vs) == 0, "see specialization");
+ using type = v0;
+};
+
+template<int v0, int v1, class... vs>
+struct sum_impl<number<v0>, number<v1>, vs...>
+ : sum_impl<number<v0 + v1>, vs...> {};
+
+template<class... nums> using sum = typename sum_impl<nums...>::type;
+
+////////////////////////////////////////////////////////////////////////////////
+
+template<class num>
+struct conditional_impl {
+ static_assert(num{}, "see specialization");
+
+ template<class T, class F>
+ using type = T;
+};
+
+template<>
+struct conditional_impl<false_> {
+ template<class T, class F>
+ using type = F;
+};
+
+template<class num, class T, class F>
+using conditional = typename conditional_impl<num>::template type<T, F>;
+
+////////////////////////////////////////////////////////////////////////////////
+
+template<class seq>
+struct min_filter_impl;
+
+template<class... nums>
+struct min_filter_impl<list<nums...>> {
+ template<class num>
+ using count_better_mins = sum<less<nums, num>...>;
+
+ using type = list<conditional<count_better_mins<nums>, nil, nums>...>;
+};
+
+template<class seq> using min_filter = typename min_filter_impl<seq>::type;
+
+////////////////////////////////////////////////////////////////////////////////
+
+void test_min_filter() {
+ using computed = min_filter<numbers<2, 7, 2>>;
+ using expected = list<number<2>, nil, number<2>>;
+ (void)(computed{} = expected{});// compiles for identical types
+}
+
+int main() {}