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* [gcc r12-4617] libstdc++: missing constexpr for __[nm]iter_base [PR102358]
@ 2021-10-21 16:13 Patrick Palka
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From: Patrick Palka @ 2021-10-21 16:13 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:5f7976f65b45c457b57bfc2c55ec845771e0d3c2
commit r12-4617-g5f7976f65b45c457b57bfc2c55ec845771e0d3c2
Author: Patrick Palka <ppalka@redhat.com>
Date: Thu Oct 21 12:13:35 2021 -0400
libstdc++: missing constexpr for __[nm]iter_base [PR102358]
PR libstdc++/102358
libstdc++-v3/ChangeLog:
* include/bits/stl_iterator.h (__niter_base): Make constexpr
for C++20.
(__miter_base): Likewise.
* testsuite/25_algorithms/move/constexpr.cc: New test.
Diff:
---
libstdc++-v3/include/bits/stl_iterator.h | 2 ++
.../testsuite/25_algorithms/move/constexpr.cc | 19 +++++++++++++++++++
2 files changed, 21 insertions(+)
diff --git a/libstdc++-v3/include/bits/stl_iterator.h b/libstdc++-v3/include/bits/stl_iterator.h
index 0090b2d598f..f6504ece560 100644
--- a/libstdc++-v3/include/bits/stl_iterator.h
+++ b/libstdc++-v3/include/bits/stl_iterator.h
@@ -2472,6 +2472,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
/// @} group iterators
template<typename _Iterator>
+ _GLIBCXX20_CONSTEXPR
auto
__niter_base(move_iterator<_Iterator> __it)
-> decltype(make_move_iterator(__niter_base(__it.base())))
@@ -2485,6 +2486,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
};
template<typename _Iterator>
+ _GLIBCXX20_CONSTEXPR
auto
__miter_base(move_iterator<_Iterator> __it)
-> decltype(__miter_base(__it.base()))
diff --git a/libstdc++-v3/testsuite/25_algorithms/move/constexpr.cc b/libstdc++-v3/testsuite/25_algorithms/move/constexpr.cc
new file mode 100644
index 00000000000..773c55cfb50
--- /dev/null
+++ b/libstdc++-v3/testsuite/25_algorithms/move/constexpr.cc
@@ -0,0 +1,19 @@
+// { dg-options "-std=gnu++20" }
+// { dg-do compile { target c++20 } }
+
+#include <algorithm>
+#include <span>
+
+constexpr bool
+test01()
+{
+ // PR libstdc++/102358
+ int x[2] = {1,2}, y[2];
+ std::span in(x), out(y);
+ std::move(std::move_iterator(in.begin()), std::move_iterator(in.end()),
+ out.begin());
+ return std::equal(std::move_iterator(in.begin()), std::move_iterator(in.end()),
+ std::move_iterator(out.begin()));
+}
+
+static_assert(test01());
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