From 66ddd34e8db137234cdf5924c88f148033da5557 Mon Sep 17 00:00:00 2001
From: Eric Fiselier <eric@efcs.ca>
Date: Thu, 17 Nov 2016 19:23:35 +0000
Subject: Test changes for P0504R0 "Revisiting in-place tag types for
 any/optional/variant". Patch from Casey Carter

llvm-svn: 287249
---
 .../utility/utility.inplace/inplace.pass.cpp       | 91 ++++++++--------------
 1 file changed, 33 insertions(+), 58 deletions(-)

(limited to 'libcxx/test/std/utilities/utility')

diff --git a/libcxx/test/std/utilities/utility/utility.inplace/inplace.pass.cpp b/libcxx/test/std/utilities/utility/utility.inplace/inplace.pass.cpp
index 0cf8e38f5ab..e87c6f399e9 100644
--- a/libcxx/test/std/utilities/utility/utility.inplace/inplace.pass.cpp
+++ b/libcxx/test/std/utilities/utility/utility.inplace/inplace.pass.cpp
@@ -11,21 +11,24 @@
 
 // <utility>
 
-// struct in_place_tag { in_place_tag() = delete; };
-//
-// using in_place_t = in_place_tag(&)(unspecified);
+// struct in_place_t {
+//   explicit in_place_t() = default;
+// };
+// inline constexpr in_place_t in_place{};
+
 // template <class T>
-//     using in_place_type_t = in_place_tag(&)(unspecified<T>);
-// template <size_t N>
-//     using in_place_index_t = in_place_tag(&)(unspecified<N>);
-//
-// in_place_tag in_place(unspecified);
-//
-// template <class T>;
-// in_place_tag in_place(unspecified<T>);
-//
-// template <size_t N>
-// in_place_tag in_place(unspecified<N>);
+//   struct in_place_type_t {
+//     explicit in_place_type_t() = default;
+//   };
+// template <class T>
+//   inline constexpr in_place_type_t<T> in_place_type{};
+
+// template <size_t I>
+//   struct in_place_index_t {
+//     explicit in_place_index_t() = default;
+//   };
+// template <size_t I>
+//   inline constexpr in_place_index_t<I> in_place_index{};
 
 #include <utility>
 #include <cassert>
@@ -34,66 +37,38 @@
 #include "test_macros.h"
 #include "type_id.h"
 
-template <class Tp>
-struct CheckRet : std::false_type {};
-template <class Arg>
-struct CheckRet<std::in_place_tag(Arg)> : std::true_type {};
-
-TypeID const* test_fn(std::in_place_t) { return &makeTypeID<std::in_place_t>(); }
-template <class T>
-TypeID const* test_fn(std::in_place_type_t<T>)
-{ return &makeTypeID<std::in_place_type_t<T>>(); }
-
-template <size_t I>
-TypeID const* test_fn(std::in_place_index_t<I>)
-{ return &makeTypeID<std::in_place_index_t<I>>(); }
-
-// Concrete test overloads that don't have to be deduced.
-template <class Tag>
-TypeID const* concrete_test_fn(Tag) {  return &makeTypeID<Tag>(); }
-
-template <class Tp>
-bool check_tag_basic() {
-  using RawTp = typename std::remove_reference<Tp>::type;
-  static_assert(std::is_lvalue_reference<Tp>::value, "");
-  static_assert(std::is_function<RawTp>::value, "");
-  static_assert(CheckRet<RawTp>::value, "");
-  auto concrete_fn = concrete_test_fn<Tp>;
-  return test_fn((Tp)std::in_place) == &makeTypeID<Tp>()
-      && concrete_fn(std::in_place) == &makeTypeID<Tp>();
+template <class Tp, class Up>
+constexpr bool check_tag(Up) {
+    return std::is_same<Tp, std::decay_t<Tp>>::value
+        && std::is_same<Tp, Up>::value;
 }
 
 int main() {
-    // test in_place_tag
-    {
-        static_assert(!std::is_default_constructible<std::in_place_tag>::value, "");
-    }
     // test in_place_t
     {
         using T = std::in_place_t;
-        assert(check_tag_basic<std::in_place_t>());
-        assert(test_fn((T)std::in_place) == &makeTypeID<T>());
+        static_assert(check_tag<T>(std::in_place));
     }
     // test in_place_type_t
     {
         using T1 = std::in_place_type_t<void>;
         using T2 = std::in_place_type_t<int>;
         using T3 = std::in_place_type_t<const int>;
-        assert(check_tag_basic<T1>());
-        assert(check_tag_basic<T2>());
-        assert(check_tag_basic<T3>());
-        static_assert(!std::is_same<T1, T2>::value && !std::is_same<T1, T3>::value, "");
-        static_assert(!std::is_same<T2, T3>::value, "");
+        static_assert(!std::is_same<T1, T2>::value && !std::is_same<T1, T3>::value);
+        static_assert(!std::is_same<T2, T3>::value);
+        static_assert(check_tag<T1>(std::in_place_type<void>));
+        static_assert(check_tag<T2>(std::in_place_type<int>));
+        static_assert(check_tag<T3>(std::in_place_type<const int>));
     }
     // test in_place_index_t
     {
         using T1 = std::in_place_index_t<0>;
         using T2 = std::in_place_index_t<1>;
         using T3 = std::in_place_index_t<static_cast<size_t>(-1)>;
-        assert(check_tag_basic<T1>());
-        assert(check_tag_basic<T2>());
-        assert(check_tag_basic<T3>());
-        static_assert(!std::is_same<T1, T2>::value && !std::is_same<T1, T3>::value, "");
-        static_assert(!std::is_same<T2, T3>::value, "");
+        static_assert(!std::is_same<T1, T2>::value && !std::is_same<T1, T3>::value);
+        static_assert(!std::is_same<T2, T3>::value);
+        static_assert(check_tag<T1>(std::in_place_index<0>));
+        static_assert(check_tag<T2>(std::in_place_index<1>));
+        static_assert(check_tag<T3>(std::in_place_index<static_cast<size_t>(-1)>));
     }
-}
\ No newline at end of file
+}
-- 
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