Fix ConstexprIterator requirements tests - No constexpr algorithms!

2019-06-09  Edward Smith-Rowland  <3dw4rd@verizon.net>

	Fix ConstexprIterator requirements tests - No constexpr algorithms!
	* testsuite/21_strings/basic_string_view/requirements/constexpr_iter.cc:
	Replace copy with hand-rolled loop.
	* testsuite/23_containers/array/requirements/constexpr_iter.cc:
	Ditto.

From-SVN: r272159

libstdc++-v3/ChangeLog

+2019-06-09  Edward Smith-Rowland  <3dw4rd@verizon.net>
+
+	Fix ConstexprIterator requirements tests - No constexpr algorithms!
+	* testsuite/21_strings/basic_string_view/requirements/constexpr_iter.cc:
+	Replace copy with hand-rolled loop.
+	* testsuite/23_containers/array/requirements/constexpr_iter.cc:
+	Ditto.
+
 2019-06-08  Edward Smith-Rowland  <3dw4rd@verizon.net>
 
 	Test for C++20 p0858 - ConstexprIterator requirements.

libstdc++-v3/testsuite/21_strings/basic_string_view/requirements/constexpr_iter.cc

@@ -30,7 +30,11 @@ test()
   static_assert('W' == *(hw.cbegin() + 7));
 
   std::array<int, hw.size()> a2{{0,0,0,0,0,0,0,0,0,0,0,0,0}};
-  std::copy(hw.begin(), hw.end(), a2.begin());
+  auto hwi = hw.begin();
+  auto hwe = hw.end();
+  auto a2i = a2.begin();
+  while (hwi != hwe)
+    *a2i++ = *hwi++;
 
   return *(hw.cbegin() + 3);
 }

libstdc++-v3/testsuite/23_containers/array/requirements/constexpr_iter.cc

@@ -29,7 +29,11 @@ test()
   static_assert(1 == *a1.cbegin());
 
   std::array<int, 3> a2{{0, 0, 0}};
-  std::copy(a1.begin(), a1.end(), a2.begin());
+  auto a1i = a1.begin();
+  auto a1e = a1.end();
+  auto a2i = a2.begin();
+  while (a1i != a1e)
+    *a2i++ = *a1i++;
 
   return n;
 }