Skip to content

<utility>: Privatize pair's internal non-Standard constructor #4979

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 2 commits into from
Sep 28, 2024
+13 −5
Merged

<utility>: Privatize pair's internal non-Standard constructor #4979

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
2661d1f
Privatize `pair`'s internal non-Standard constructor
frederick-vs-ja Sep 24, 2024
8fa5860
Revert relocation of deleted `operator=`
frederick-vs-ja Sep 24, 2024
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
11 changes: 6 additions & 5 deletions stl/inc/utility
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -315,11 +315,6 @@ struct pair { // store a pair of values
}
#endif // _HAS_CXX23

template <class _Tuple1, class _Tuple2, size_t... _Indices1, size_t... _Indices2>
constexpr pair(_Tuple1& _Val1, _Tuple2& _Val2, index_sequence<_Indices1...>, index_sequence<_Indices2...>)
: first(_STD _Tuple_get<_Indices1>(_STD move(_Val1))...),
second(_STD _Tuple_get<_Indices2>(_STD move(_Val2))...) {}

template <class... _Types1, class... _Types2>
_CONSTEXPR20 pair(piecewise_construct_t, tuple<_Types1...> _Val1, tuple<_Types2...> _Val2)
: pair(_Val1, _Val2, index_sequence_for<_Types1...>{}, index_sequence_for<_Types2...>{}) {}
Expand Down Expand Up @@ -466,6 +461,12 @@ struct pair { // store a pair of values

_Ty1 first; // the first stored value
_Ty2 second; // the second stored value

private:
template <class _Tuple1, class _Tuple2, size_t... _Indices1, size_t... _Indices2>
constexpr pair(_Tuple1& _Val1, _Tuple2& _Val2, index_sequence<_Indices1...>, index_sequence<_Indices2...>)
: first(_STD _Tuple_get<_Indices1>(_STD move(_Val1))...),
second(_STD _Tuple_get<_Indices2>(_STD move(_Val2))...) {}
};

#if _HAS_CXX17
Expand Down
7 changes: 7 additions & 0 deletions tests/std/tests/VSO_0000000_more_pair_tuple_sfinae/test.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -558,6 +558,13 @@ STATIC_ASSERT(!is_constructible_v<tuple<A>, allocator_arg_t, allocator<int>, pai
STATIC_ASSERT(is_constructible_v<tuple<A, A>, allocator_arg_t, allocator<int>, pair<Ex, Ex>>);
STATIC_ASSERT(!is_constructible_v<tuple<A, A, A>, allocator_arg_t, allocator<int>, pair<Ex, Ex>>);

// Also test that the internal constructor used for the piecewise_construct_t constructor of pair is not public.
STATIC_ASSERT(!is_constructible_v<pair<int, int>, tuple<>&, tuple<>&, make_index_sequence<0>, make_index_sequence<0>>);
STATIC_ASSERT(
!is_constructible_v<pair<int, int>, tuple<int>&, tuple<>&, make_index_sequence<1>, make_index_sequence<0>>);
STATIC_ASSERT(
!is_constructible_v<pair<int, int>, tuple<int>&, tuple<int>&, make_index_sequence<1>, make_index_sequence<1>>);


pair<int, int> func1() {
const int x = 17;
Expand Down