libstdc++: Improve comment about testsuite utilities

This fixes a typo and also explains why test_container is not a range
when used with output_iterator_wrapper or input_iterator_wrapper.

	* testsuite/util/testsuite_iterators.h: Improve comment.

From-SVN: r280146

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 3d25ecc3da1a3e86fa5cf93493db3e8a2d30836a..79a5887f7d09c5720fb52828aca6f683d1932eaa 100644 (file)
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,7 @@
 2020-01-10  Jonathan Wakely  <jwakely@redhat.com>
 
+       * testsuite/util/testsuite_iterators.h: Improve comment.
+
        * testsuite/25_algorithms/equal/deque_iterators/1.cc: Don't use C++11
        initialization syntax.
 

diff --git a/libstdc++-v3/testsuite/util/testsuite_iterators.h b/libstdc++-v3/testsuite/util/testsuite_iterators.h
index e01d7daea5da1adbca87befdc5a005f659ab2637..eb15257bf6a248c7214705099f5603d40f8a1bb2 100644 (file)
--- a/libstdc++-v3/testsuite/util/testsuite_iterators.h
+++ b/libstdc++-v3/testsuite/util/testsuite_iterators.h
@@ -759,10 +759,13 @@ namespace __gnu_test
     using test_output_sized_range
       = test_sized_range<T, output_iterator_wrapper>;
 
-// test_container, test_range and test_sized_range do not own their elements,
-// so they all model std::ranges::safe_range. This file does not define
-// specializations of std::ranges::enable_safe_range, so that individual
-// test can decide whether or not to do so.
+// test_range and test_sized_range do not own their elements, so they model
+// std::ranges::safe_range.  This file does not define specializations of
+// std::ranges::enable_safe_range, so that individual tests can decide
+// whether or not to do so.
+// This is also true for test_container, although only when it has forward
+// iterators (because output_iterator_wrapper and input_iterator_wrapper are
+// not default constructible so do not model std::input_or_output_iterator).
 #endif // C++20
 } // namespace __gnu_test
 #endif // _TESTSUITE_ITERATORS