libstdc++-v3/ChangeLog:
LWG 3325 Constrain return type of transformation function for
transform_view
* include/std/ranges (transform_view): Constrain the return type of the
transformation function as per LWG 3325.
* testsuite/std/ranges/adaptors/lwg3325_neg.cc: New test.
---
libstdc++-v3/include/std/ranges | 2 ++
.../std/ranges/adaptors/lwg3325_neg.cc | 35 +++++++++++++++++++
2 files changed, 37 insertions(+)
create mode 100644 libstdc++-v3/testsuite/std/ranges/adaptors/lwg3325_neg.cc
diff --git a/libstdc++-v3/include/std/ranges b/libstdc++-v3/include/std/ranges
index ffdd3367b05..442d1d08098 100644
--- a/libstdc++-v3/include/std/ranges
+++ b/libstdc++-v3/include/std/ranges
@@ -1540,6 +1540,8 @@ namespace views
template<input_range _Vp, copy_constructible _Fp>
requires view<_Vp> && is_object_v<_Fp>
&& regular_invocable<_Fp&, range_reference_t<_Vp>>
+ && std::__detail::__can_reference<invoke_result_t<_Fp&,
+ range_reference_t<_Vp>>>
class transform_view : public view_interface<transform_view<_Vp, _Fp>>
{
private:
diff --git a/libstdc++-v3/testsuite/std/ranges/adaptors/lwg3325_neg.cc
b/libstdc++-v3/testsuite/std/ranges/adaptors/lwg3325_neg.cc
new file mode 100644
index 00000000000..ac174714574
--- /dev/null
+++ b/libstdc++-v3/testsuite/std/ranges/adaptors/lwg3325_neg.cc
@@ -0,0 +1,35 @@
+// Copyright (C) 2020 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+#include <ranges>
+
+namespace ranges = std::ranges;
+namespace views = std::views;
+
+void
+test01()
+{
+ auto f = [] (int x) { };
+ int x[] = {1};
+ auto v = ranges::transform_view{x, f}; // { dg-error "deduction failed|no
match" }
+}
+
+// { dg-prune-output "constraint failure" }
+// { dg-prune-output "in requirements" }
--
2.25.1.291.ge68e29171c
