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[PATCH 2/2] libstdc++: P2106R0 Alternative wording for GB315 and GB316
- From: Patrick Palka <ppalka at redhat dot com>
- To: gcc-patches at gcc dot gnu dot org
- Cc: libstdc++ at gcc dot gnu dot org, jwakely at redhat dot com, Patrick Palka <ppalka at redhat dot com>
- Date: Mon, 17 Feb 2020 17:00:59 -0500
- Subject: [PATCH 2/2] libstdc++: P2106R0 Alternative wording for GB315 and GB316
- References: <20200217220059.1047256-1-ppalka@redhat.com>
libstdc++-v3/ChangeLog:
P2106R0
* include/bits/ranges_algo.h (in_fun_result): New.
(for_each_result, for_each_n_result): Change into an alias of
in_fun_result.
(in_in_result): New.
(mismatch_result): Change into an alias of in_in_result.
(copy_if_result): Change into an alias of in_out_result.
(swap_ranges_result): Change into an alias of in_in_result.
(unary_transform_result): Change into an alias of in_out_result.
(in_in_out_result): New.
(binary_transform_result): Change into an alias of in_in_out_result.
(replace_copy_result, replace_copy_if_result, remove_copy_if_result,
remove_copy_result, unique_copy_result, reverse_copy_result,
rotate_copy_result, partial_sort_copy_result): Change into an alias of
in_out_result.
(in_out_out_result): New.
(partition_copy_result, merge_result): Change into an alias of
in_out_out_result.
(set_union_result, set_intersection_result): Change into an alias of
in_in_out_result.
(set_difference_result): Change into an alias of in_out_result.
(set_symmetric_difference): Change into an alias of in_in_out_result.
(min_max_result): New.
(minmax_result, minmax_element_result): Change into an alias of
min_max_result.
(in_found_result): New.
(next_permutation_result, prev_permutation_result): Change into an alias
of in_found_result.
(__next_permutation_fn::operator(), __prev_permutation_fn::operator()):
Adjust following changes to next_permutation_result and
prev_permutation_result.
* include/bits/ranges_algobase.h (in_out_result): New.
(copy_result, move_result, move_backward_result, copy_backward_result,
copy_n_result): Change into an alias of in_out_result.
* include/bits/ranges_uninitialized.h (uninitialized_copy_result,
uninitialized_copy_n_result, uninitialized_move_result,
uninitialized_move_n_result): Likewise.
* testsuite/25_algorithms/next_permutation/constrained.cc: Adjust uses of
structured bindings.
* testsuite/25_algorithms/prev_permutation/constrained.cc: Likewise.
---
libstdc++-v3/include/bits/ranges_algo.h | 137 +++++++++++-------
libstdc++-v3/include/bits/ranges_algobase.h | 19 ++-
.../include/bits/ranges_uninitialized.h | 8 +-
.../next_permutation/constrained.cc | 4 +-
.../prev_permutation/constrained.cc | 4 +-
5 files changed, 108 insertions(+), 64 deletions(-)
diff --git a/libstdc++-v3/include/bits/ranges_algo.h b/libstdc++-v3/include/bits/ranges_algo.h
index c50b369c6c0..31b1bf0d448 100644
--- a/libstdc++-v3/include/bits/ranges_algo.h
+++ b/libstdc++-v3/include/bits/ranges_algo.h
@@ -152,7 +152,7 @@ namespace ranges
inline constexpr __none_of_fn none_of{};
template<typename _Iter, typename _Fp>
- struct for_each_result
+ struct in_fun_result
{
[[no_unique_address]] _Iter in;
[[no_unique_address]] _Fp fun;
@@ -160,15 +160,20 @@ namespace ranges
template<typename _Iter2, typename _F2p>
requires convertible_to<const _Iter&, _Iter2>
&& convertible_to<const _Fp&, _F2p>
- operator for_each_result<_Iter2, _F2p>() const &
+ constexpr
+ operator in_fun_result<_Iter2, _F2p>() const &
{ return {in, fun}; }
template<typename _Iter2, typename _F2p>
requires convertible_to<_Iter, _Iter2> && convertible_to<_Fp, _F2p>
- operator for_each_result<_Iter2, _F2p>() &&
+ constexpr
+ operator in_fun_result<_Iter2, _F2p>() &&
{ return {std::move(in), std::move(fun)}; }
};
+ template<typename _Iter, typename _Fp>
+ using for_each_result = in_fun_result<_Iter, _Fp>;
+
struct __for_each_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
@@ -196,7 +201,7 @@ namespace ranges
inline constexpr __for_each_fn for_each{};
template<typename _Iter, typename _Fp>
- using for_each_n_result = for_each_result<_Iter, _Fp>;
+ using for_each_n_result = in_fun_result<_Iter, _Fp>;
struct __for_each_n_fn
{
@@ -416,7 +421,7 @@ namespace ranges
inline constexpr __count_if_fn count_if{};
template<typename _Iter1, typename _Iter2>
- struct mismatch_result
+ struct in_in_result
{
[[no_unique_address]] _Iter1 in1;
[[no_unique_address]] _Iter2 in2;
@@ -424,16 +429,21 @@ namespace ranges
template<typename _IIter1, typename _IIter2>
requires convertible_to<const _Iter1&, _IIter1>
&& convertible_to<const _Iter2&, _IIter2>
- operator mismatch_result<_IIter1, _IIter2>() const &
+ constexpr
+ operator in_in_result<_IIter1, _IIter2>() const &
{ return {in1, in2}; }
template<typename _IIter1, typename _IIter2>
requires convertible_to<_Iter1, _IIter1>
&& convertible_to<_Iter2, _IIter2>
- operator mismatch_result<_IIter1, _IIter2>() &&
+ constexpr
+ operator in_in_result<_IIter1, _IIter2>() &&
{ return {std::move(in1), std::move(in2)}; }
};
+ template<typename _Iter1, typename _Iter2>
+ using mismatch_result = in_in_result<_Iter1, _Iter2>;
+
struct __mismatch_fn
{
template<input_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
@@ -830,7 +840,7 @@ namespace ranges
inline constexpr __is_permutation_fn is_permutation{};
template<typename _Iter, typename _Out>
- using copy_if_result = copy_result<_Iter, _Out>;
+ using copy_if_result = in_out_result<_Iter, _Out>;
struct __copy_if_fn
{
@@ -869,7 +879,7 @@ namespace ranges
inline constexpr __copy_if_fn copy_if{};
template<typename _Iter1, typename _Iter2>
- using swap_ranges_result = mismatch_result<_Iter1, _Iter2>;
+ using swap_ranges_result = in_in_result<_Iter1, _Iter2>;
struct __swap_ranges_fn
{
@@ -900,10 +910,10 @@ namespace ranges
inline constexpr __swap_ranges_fn swap_ranges{};
template<typename _Iter, typename _Out>
- using unary_transform_result = copy_result<_Iter, _Out>;
+ using unary_transform_result = in_out_result<_Iter, _Out>;
template<typename _Iter1, typename _Iter2, typename _Out>
- struct binary_transform_result
+ struct in_in_out_result
{
[[no_unique_address]] _Iter1 in1;
[[no_unique_address]] _Iter2 in2;
@@ -913,17 +923,22 @@ namespace ranges
requires convertible_to<const _Iter1&, _IIter1>
&& convertible_to<const _Iter2&, _IIter2>
&& convertible_to<const _Out&, _OOut>
- operator binary_transform_result<_IIter1, _IIter2, _OOut>() const &
+ constexpr
+ operator in_in_out_result<_IIter1, _IIter2, _OOut>() const &
{ return {in1, in2, out}; }
template<typename _IIter1, typename _IIter2, typename _OOut>
requires convertible_to<_Iter1, _IIter1>
&& convertible_to<_Iter2, _IIter2>
&& convertible_to<_Out, _OOut>
- operator binary_transform_result<_IIter1, _IIter2, _OOut>() &&
+ constexpr
+ operator in_in_out_result<_IIter1, _IIter2, _OOut>() &&
{ return {std::move(in1), std::move(in2), std::move(out)}; }
};
+ template<typename _Iter1, typename _Iter2, typename _Out>
+ using binary_transform_result = in_in_out_result<_Iter1, _Iter2, _Out>;
+
struct __transform_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
@@ -1065,7 +1080,7 @@ namespace ranges
inline constexpr __replace_if_fn replace_if{};
template<typename _Iter, typename _Out>
- using replace_copy_result = copy_result<_Iter, _Out>;
+ using replace_copy_result = in_out_result<_Iter, _Out>;
struct __replace_copy_fn
{
@@ -1108,7 +1123,7 @@ namespace ranges
inline constexpr __replace_copy_fn replace_copy{};
template<typename _Iter, typename _Out>
- using replace_copy_if_result = copy_result<_Iter, _Out>;
+ using replace_copy_if_result = in_out_result<_Iter, _Out>;
struct __replace_copy_if_fn
{
@@ -1261,7 +1276,7 @@ namespace ranges
inline constexpr __remove_fn remove{};
template<typename _Iter, typename _Out>
- using remove_copy_if_result = copy_result<_Iter, _Out>;
+ using remove_copy_if_result = in_out_result<_Iter, _Out>;
struct __remove_copy_if_fn
{
@@ -1300,7 +1315,7 @@ namespace ranges
inline constexpr __remove_copy_if_fn remove_copy_if{};
template<typename _Iter, typename _Out>
- using remove_copy_result = copy_result<_Iter, _Out>;
+ using remove_copy_result = in_out_result<_Iter, _Out>;
struct __remove_copy_fn
{
@@ -1379,7 +1394,7 @@ namespace ranges
inline constexpr __unique_fn unique{};
template<typename _Iter, typename _Out>
- using unique_copy_result = copy_result<_Iter, _Out>;
+ using unique_copy_result = in_out_result<_Iter, _Out>;
struct __unique_copy_fn
{
@@ -1514,7 +1529,7 @@ namespace ranges
inline constexpr __reverse_fn reverse{};
template<typename _Iter, typename _Out>
- using reverse_copy_result = copy_result<_Iter, _Out>;
+ using reverse_copy_result = in_out_result<_Iter, _Out>;
struct __reverse_copy_fn
{
@@ -1695,7 +1710,7 @@ namespace ranges
inline constexpr __rotate_fn rotate{};
template<typename _Iter, typename _Out>
- using rotate_copy_result = copy_result<_Iter, _Out>;
+ using rotate_copy_result = in_out_result<_Iter, _Out>;
struct __rotate_copy_fn
{
@@ -2093,7 +2108,7 @@ namespace ranges
inline constexpr __partial_sort_fn partial_sort{};
template<typename _Iter, typename _Out>
- using partial_sort_copy_result = copy_result<_Iter, _Out>;
+ using partial_sort_copy_result = in_out_result<_Iter, _Out>;
struct __partial_sort_copy_fn
{
@@ -2580,28 +2595,33 @@ namespace ranges
inline constexpr __stable_partition_fn stable_partition{};
- template<typename _Iter, typename _Out1, typename _O2>
- struct partition_copy_result
+ template<typename _Iter, typename _Out1, typename _Out2>
+ struct in_out_out_result
{
[[no_unique_address]] _Iter in;
[[no_unique_address]] _Out1 out1;
- [[no_unique_address]] _O2 out2;
+ [[no_unique_address]] _Out2 out2;
template<typename _IIter, typename _OOut1, typename _OOut2>
requires convertible_to<const _Iter&, _IIter>
&& convertible_to<const _Out1&, _OOut1>
- && convertible_to<const _O2&, _OOut2>
- operator partition_copy_result<_IIter, _OOut1, _OOut2>() const &
+ && convertible_to<const _Out2&, _OOut2>
+ constexpr
+ operator in_out_out_result<_IIter, _OOut1, _OOut2>() const &
{ return {in, out1, out2}; }
template<typename _IIter, typename _OOut1, typename _OOut2>
requires convertible_to<_Iter, _IIter>
&& convertible_to<_Out1, _OOut1>
- && convertible_to<_O2, _OOut2>
- operator partition_copy_result<_IIter, _OOut1, _OOut2>() &&
+ && convertible_to<_Out2, _OOut2>
+ constexpr
+ operator in_out_out_result<_IIter, _OOut1, _OOut2>() &&
{ return {std::move(in), std::move(out1), std::move(out2)}; }
};
+ template<typename _Iter, typename _Out1, typename _Out2>
+ using partition_copy_result = in_out_out_result<_Iter, _Out1, _Out2>;
+
struct __partition_copy_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
@@ -2692,7 +2712,7 @@ namespace ranges
inline constexpr __partition_point_fn partition_point{};
template<typename _Iter1, typename _Iter2, typename _Out>
- using merge_result = binary_transform_result<_Iter1, _Iter2, _Out>;
+ using merge_result = in_in_out_result<_Iter1, _Iter2, _Out>;
struct __merge_fn
{
@@ -2834,7 +2854,7 @@ namespace ranges
inline constexpr __includes_fn includes{};
template<typename _Iter1, typename _Iter2, typename _Out>
- using set_union_result = binary_transform_result<_Iter1, _Iter2, _Out>;
+ using set_union_result = in_in_out_result<_Iter1, _Iter2, _Out>;
struct __set_union_fn
{
@@ -2902,8 +2922,7 @@ namespace ranges
inline constexpr __set_union_fn set_union{};
template<typename _Iter1, typename _Iter2, typename _Out>
- using set_intersection_result
- = binary_transform_result<_Iter1, _Iter2, _Out>;
+ using set_intersection_result = in_in_out_result<_Iter1, _Iter2, _Out>;
struct __set_intersection_fn
{
@@ -2961,7 +2980,7 @@ namespace ranges
inline constexpr __set_intersection_fn set_intersection{};
template<typename _Iter, typename _Out>
- using set_difference_result = copy_result<_Iter, _Out>;
+ using set_difference_result = in_out_result<_Iter, _Out>;
struct __set_difference_fn
{
@@ -3019,7 +3038,7 @@ namespace ranges
template<typename _Iter1, typename _Iter2, typename _Out>
using set_symmetric_difference_result
- = binary_transform_result<_Iter1, _Iter2, _Out>;
+ = in_in_out_result<_Iter1, _Iter2, _Out>;
struct __set_symmetric_difference_fn
{
@@ -3218,22 +3237,27 @@ namespace ranges
inline constexpr __clamp_fn clamp{};
template<typename _Tp>
- struct minmax_result
+ struct min_max_result
{
[[no_unique_address]] _Tp min;
[[no_unique_address]] _Tp max;
template<typename _Tp2>
requires convertible_to<const _Tp&, _Tp2>
- operator minmax_result<_Tp2>() const &
+ constexpr
+ operator min_max_result<_Tp2>() const &
{ return {min, max}; }
template<typename _Tp2>
requires convertible_to<_Tp, _Tp2>
- operator minmax_result<_Tp2>() &&
+ constexpr
+ operator min_max_result<_Tp2>() &&
{ return {std::move(min), std::move(max)}; }
};
+ template<typename _Tp>
+ using minmax_result = min_max_result<_Tp>;
+
struct __minmax_fn
{
template<typename _Tp, typename _Proj = identity,
@@ -3367,7 +3391,7 @@ namespace ranges
inline constexpr __max_element_fn max_element{};
template<typename _Iter>
- using minmax_element_result = minmax_result<_Iter>;
+ using minmax_element_result = min_max_result<_Iter>;
struct __minmax_element_fn
{
@@ -3516,12 +3540,27 @@ namespace ranges
inline constexpr __lexicographical_compare_fn lexicographical_compare;
template<typename _Iter>
- struct next_permutation_result
+ struct in_found_result
{
+ [[no_unique_address]] _Iter in;
bool found;
- _Iter in;
+
+ template<typename _Iter2>
+ requires convertible_to<const _Iter&, _Iter2>
+ constexpr
+ operator in_found_result<_Iter2>() const &
+ { return {in, found}; }
+
+ template<typename _Iter2>
+ requires convertible_to<_Iter, _Iter2>
+ constexpr
+ operator in_found_result<_Iter2>() &&
+ { return {std::move(in), found}; }
};
+ template<typename _Iter>
+ using next_permutation_result = in_found_result<_Iter>;
+
struct __next_permutation_fn
{
template<bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent,
@@ -3532,12 +3571,12 @@ namespace ranges
_Comp __comp = {}, _Proj __proj = {}) const
{
if (__first == __last)
- return {false, std::move(__first)};
+ return {std::move(__first), false};
auto __i = __first;
++__i;
if (__i == __last)
- return {false, std::move(__i)};
+ return {std::move(__i), false};
auto __lasti = ranges::next(__first, __last);
__i = __lasti;
@@ -3558,12 +3597,12 @@ namespace ranges
;
ranges::iter_swap(__i, __j);
ranges::reverse(__ii, __last);
- return {true, std::move(__lasti)};
+ return {std::move(__lasti), true};
}
if (__i == __first)
{
ranges::reverse(__first, __last);
- return {false, std::move(__lasti)};
+ return {std::move(__lasti), false};
}
}
}
@@ -3582,7 +3621,7 @@ namespace ranges
inline constexpr __next_permutation_fn next_permutation{};
template<typename _Iter>
- using prev_permutation_result = next_permutation_result<_Iter>;
+ using prev_permutation_result = in_found_result<_Iter>;
struct __prev_permutation_fn
{
@@ -3594,12 +3633,12 @@ namespace ranges
_Comp __comp = {}, _Proj __proj = {}) const
{
if (__first == __last)
- return {false, std::move(__first)};
+ return {std::move(__first), false};
auto __i = __first;
++__i;
if (__i == __last)
- return {false, std::move(__i)};
+ return {std::move(__i), false};
auto __lasti = ranges::next(__first, __last);
__i = __lasti;
@@ -3620,12 +3659,12 @@ namespace ranges
;
ranges::iter_swap(__i, __j);
ranges::reverse(__ii, __last);
- return {true, std::move(__lasti)};
+ return {std::move(__lasti), true};
}
if (__i == __first)
{
ranges::reverse(__first, __last);
- return {false, std::move(__lasti)};
+ return {std::move(__lasti), false};
}
}
}
diff --git a/libstdc++-v3/include/bits/ranges_algobase.h b/libstdc++-v3/include/bits/ranges_algobase.h
index eedd29f570a..7424766f053 100644
--- a/libstdc++-v3/include/bits/ranges_algobase.h
+++ b/libstdc++-v3/include/bits/ranges_algobase.h
@@ -157,7 +157,7 @@ namespace ranges
inline constexpr __equal_fn equal{};
template<typename _Iter, typename _Out>
- struct copy_result
+ struct in_out_result
{
[[no_unique_address]] _Iter in;
[[no_unique_address]] _Out out;
@@ -165,24 +165,29 @@ namespace ranges
template<typename _Iter2, typename _Out2>
requires convertible_to<const _Iter&, _Iter2>
&& convertible_to<const _Out&, _Out2>
- operator copy_result<_Iter2, _Out2>() const &
+ constexpr
+ operator in_out_result<_Iter2, _Out2>() const &
{ return {in, out}; }
template<typename _Iter2, typename _Out2>
requires convertible_to<_Iter, _Iter2>
&& convertible_to<_Out, _Out2>
- operator copy_result<_Iter2, _Out2>() &&
+ constexpr
+ operator in_out_result<_Iter2, _Out2>() &&
{ return {std::move(in), std::move(out)}; }
};
template<typename _Iter, typename _Out>
- using move_result = copy_result<_Iter, _Out>;
+ using copy_result = in_out_result<_Iter, _Out>;
+
+ template<typename _Iter, typename _Out>
+ using move_result = in_out_result<_Iter, _Out>;
template<typename _Iter1, typename _Iter2>
- using move_backward_result = copy_result<_Iter1, _Iter2>;
+ using move_backward_result = in_out_result<_Iter1, _Iter2>;
template<typename _Iter1, typename _Iter2>
- using copy_backward_result = copy_result<_Iter1, _Iter2>;
+ using copy_backward_result = in_out_result<_Iter1, _Iter2>;
template<bool _IsMove,
bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent,
@@ -483,7 +488,7 @@ namespace ranges
inline constexpr __move_backward_fn move_backward{};
template<typename _Iter, typename _Out>
- using copy_n_result = copy_result<_Iter, _Out>;
+ using copy_n_result = in_out_result<_Iter, _Out>;
struct __copy_n_fn
{
diff --git a/libstdc++-v3/include/bits/ranges_uninitialized.h b/libstdc++-v3/include/bits/ranges_uninitialized.h
index bbf683de066..881bf39d5f8 100644
--- a/libstdc++-v3/include/bits/ranges_uninitialized.h
+++ b/libstdc++-v3/include/bits/ranges_uninitialized.h
@@ -253,7 +253,7 @@ namespace ranges
uninitialized_value_construct_n;
template<typename _Iter, typename _Out>
- using uninitialized_copy_result = copy_result<_Iter, _Out>;
+ using uninitialized_copy_result = in_out_result<_Iter, _Out>;
struct __uninitialized_copy_fn
{
@@ -302,7 +302,7 @@ namespace ranges
inline constexpr __uninitialized_copy_fn uninitialized_copy{};
template<typename _Iter, typename _Out>
- using uninitialized_copy_n_result = uninitialized_copy_result<_Iter, _Out>;
+ using uninitialized_copy_n_result = in_out_result<_Iter, _Out>;
struct __uninitialized_copy_n_fn
{
@@ -337,7 +337,7 @@ namespace ranges
inline constexpr __uninitialized_copy_n_fn uninitialized_copy_n{};
template<typename _Iter, typename _Out>
- using uninitialized_move_result = uninitialized_copy_result<_Iter, _Out>;
+ using uninitialized_move_result = in_out_result<_Iter, _Out>;
struct __uninitialized_move_fn
{
@@ -389,7 +389,7 @@ namespace ranges
inline constexpr __uninitialized_move_fn uninitialized_move{};
template<typename _Iter, typename _Out>
- using uninitialized_move_n_result = uninitialized_copy_result<_Iter, _Out>;
+ using uninitialized_move_n_result = in_out_result<_Iter, _Out>;
struct __uninitialized_move_n_fn
{
diff --git a/libstdc++-v3/testsuite/25_algorithms/next_permutation/constrained.cc b/libstdc++-v3/testsuite/25_algorithms/next_permutation/constrained.cc
index e69b551a56b..b397a4e8ed7 100644
--- a/libstdc++-v3/testsuite/25_algorithms/next_permutation/constrained.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/next_permutation/constrained.cc
@@ -41,7 +41,7 @@ test01()
for (int j = 0; ; j++)
{
auto found1 = std::next_permutation(cx.begin(), cx.end());
- auto [found2,last] = ranges::next_permutation(cy.begin(), cy.end());
+ auto [last,found2] = ranges::next_permutation(cy.begin(), cy.end());
VERIFY( found1 == found2 );
VERIFY( ranges::equal(cx, cy) );
if (!found2)
@@ -55,7 +55,7 @@ test02()
{
int x[] = {5, 4, 3, 2, 1};
test_range<int, bidirectional_iterator_wrapper> rx(x);
- auto [found,last] = ranges::next_permutation(rx, ranges::greater{});
+ auto [last,found] = ranges::next_permutation(rx, ranges::greater{});
VERIFY( found && last == rx.end() );
VERIFY( last == rx.end() );
VERIFY( ranges::equal(rx, (int[]){5,4,3,1,2}) );
diff --git a/libstdc++-v3/testsuite/25_algorithms/prev_permutation/constrained.cc b/libstdc++-v3/testsuite/25_algorithms/prev_permutation/constrained.cc
index 25bbad9be0c..22f1329b4c7 100644
--- a/libstdc++-v3/testsuite/25_algorithms/prev_permutation/constrained.cc
+++ b/libstdc++-v3/testsuite/25_algorithms/prev_permutation/constrained.cc
@@ -41,7 +41,7 @@ test01()
for (int j = 0; ; j++)
{
auto found1 = std::prev_permutation(cx.begin(), cx.end());
- auto [found2,last] = ranges::prev_permutation(cy.begin(), cy.end());
+ auto [last,found2] = ranges::prev_permutation(cy.begin(), cy.end());
VERIFY( found1 == found2 );
VERIFY( ranges::equal(cx, cy) );
if (!found2)
@@ -55,7 +55,7 @@ test02()
{
int x[] = {1, 2, 3, 4, 5};
test_range<int, bidirectional_iterator_wrapper> rx(x);
- auto [found,last] = ranges::prev_permutation(rx, ranges::greater{});
+ auto [last,found] = ranges::prev_permutation(rx, ranges::greater{});
VERIFY( found && last == rx.end() );
VERIFY( last == rx.end() );
VERIFY( ranges::equal(rx, (int[]){1,2,3,5,4}) );
--
2.25.1.291.ge68e29171c