Tweak static assertions in std::optional

	* include/std/optional: Use a separate static_assert per condition.
	* testsuite/20_util/optional/cons/value_neg.cc: Update dg-error line
	numbers.

From-SVN: r247748

libstdc++-v3/ChangeLog

 2017-05-08  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/std/optional: Use a separate static_assert per condition.
+	* testsuite/20_util/optional/cons/value_neg.cc: Update dg-error line
+	numbers.
+
 	* doc/xml/manual/mt_allocator.xml: Clarify deallocation behaviour.
 	* doc/html/*: Regenerate.
 

libstdc++-v3/include/std/optional

@@ -462,10 +462,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
         // Unique tag type.
         optional<_Tp>>
     {
-      static_assert(__and_<__not_<is_same<remove_cv_t<_Tp>, nullopt_t>>,
-			   __not_<is_same<remove_cv_t<_Tp>, in_place_t>>,
-			   __not_<is_reference<_Tp>>>(),
-                    "Invalid instantiation of optional<T>");
+      static_assert(!is_same_v<remove_cv_t<_Tp>, nullopt_t>);
+      static_assert(!is_same_v<remove_cv_t<_Tp>, in_place_t>);
+      static_assert(!is_reference_v<_Tp>);
 
     private:
       using _Base = _Optional_base<_Tp>;
@@ -756,9 +755,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	constexpr _Tp
 	value_or(_Up&& __u) const&
 	{
-	  static_assert(__and_<is_copy_constructible<_Tp>,
-			       is_convertible<_Up&&, _Tp>>(),
-			"Cannot return value");
+	  static_assert(is_copy_constructible_v<_Tp>);
+	  static_assert(is_convertible_v<_Up&&, _Tp>);
 
 	  return this->_M_is_engaged()
 	    ? this->_M_get()
@@ -769,9 +767,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	_Tp
 	value_or(_Up&& __u) &&
 	{
-	  static_assert(__and_<is_move_constructible<_Tp>,
-			       is_convertible<_Up&&, _Tp>>(),
-			"Cannot return value" );
+	  static_assert(is_move_constructible_v<_Tp>);
+	  static_assert(is_convertible_v<_Up&&, _Tp>);
 
 	  return this->_M_is_engaged()
 	    ? std::move(this->_M_get())

libstdc++-v3/testsuite/20_util/optional/cons/value_neg.cc

@@ -37,8 +37,8 @@ int main()
     std::optional<std::unique_ptr<int>> oup2 = new int;  // { dg-error "conversion" }
     struct U { explicit U(std::in_place_t); };
     std::optional<U> ou(std::in_place); // { dg-error "no matching" }
-    // { dg-error "no type" "" { target { *-*-* } } 488 }
-    // { dg-error "no type" "" { target { *-*-* } } 498 }
-    // { dg-error "no type" "" { target { *-*-* } } 555 }
+    // { dg-error "no type" "" { target { *-*-* } } 487 }
+    // { dg-error "no type" "" { target { *-*-* } } 497 }
+    // { dg-error "no type" "" { target { *-*-* } } 554 }
   }
 }