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Fix __split_buffer_pointer_layout compatibility with swift's C++ interop #170957

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junov-google wants to merge 4 commits into from
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Fix __split_buffer_pointer_layout compatibility with swift's C++ interop #170957

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779da64
Fix __split_buffer_pointer_layout compatibility with swift's C++ import
junov Dec 6, 2025
73c980d
Merge branch 'main' into main
junov-google Dec 9, 2025
1cf60d9
Fix format
junov Dec 9, 2025
6a88ec2
Include is_reference.h unconditionally
junov Dec 9, 2025
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5 changes: 5 additions & 0 deletions libcxx/CREDITS.TXT
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Original file line number Diff line number Diff line change
Expand Up @@ -112,6 +112,11 @@ N: Andrew Morrow
E: [email protected]
D: Minor patches and Linux fixes.

N: Justin Novosad
E: [email protected]
E: [email protected]
D: Minor fixes, Swift interoperability.

N: Michael Park
E: [email protected]
D: Implementation of <variant>.
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12 changes: 10 additions & 2 deletions libcxx/include/__split_buffer
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Expand Up @@ -30,6 +30,9 @@
#include <__type_traits/integral_constant.h>
#include <__type_traits/is_nothrow_assignable.h>
#include <__type_traits/is_nothrow_constructible.h>
#if _LIBCPP_STD_VER >= 20
# include <__type_traits/is_reference.h>
#endif
#include <__type_traits/is_swappable.h>
#include <__type_traits/is_trivially_destructible.h>
#include <__type_traits/is_trivially_relocatable.h>
Expand Down Expand Up @@ -68,8 +71,13 @@ protected:

public:
// Can't be defaulted due to _LIBCPP_COMPRESSED_PAIR not being an aggregate in C++03 and C++11.
_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __split_buffer_pointer_layout() : __back_cap_(nullptr) {}

_LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __split_buffer_pointer_layout()
#if _LIBCPP_STD_VER >= 20
// Prevents Swift compiler's C++ importer from implicitly instantiating this ctor when it's not supported.
requires (!is_reference_v<allocator_type>)
#endif
: __back_cap_(nullptr) {}

_LIBCPP_CONSTEXPR_SINCE_CXX20
_LIBCPP_HIDE_FROM_ABI explicit __split_buffer_pointer_layout(const allocator_type& __alloc)
: __back_cap_(nullptr), __alloc_(__alloc) {}
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