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Make to_array ADL-proof #4042

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merged 4 commits into from
Sep 22, 2023
Merged

Make to_array ADL-proof #4042

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d782e77
Make `to_array` ADL-proof
frederick-vs-ja Sep 21, 2023
e5c04fe
Qualify `_Swap_ranges_unchecked`
frederick-vs-ja Sep 21, 2023
13cecd3
Merge branch 'main' into adl-proof-to_array
StephanTLavavej Sep 22, 2023
80ddd84
Work around the `/clr` bug with incomplete types.
StephanTLavavej Sep 22, 2023
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6 changes: 3 additions & 3 deletions stl/inc/array
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Original file line number Diff line number Diff line change
Expand Up @@ -433,7 +433,7 @@ public:
}

_CONSTEXPR20 void swap(array& _Other) noexcept(_Is_nothrow_swappable<_Ty>::value) {
_Swap_ranges_unchecked(_Elems, _Elems + _Size, _Other._Elems);
_STD _Swap_ranges_unchecked(_Elems, _Elems + _Size, _Other._Elems);
}

_NODISCARD _CONSTEXPR17 iterator begin() noexcept {
Expand Down Expand Up @@ -834,7 +834,7 @@ _NODISCARD constexpr array<remove_cv_t<_Ty>, _Size> to_array(_Ty (&_Array)[_Size
"to_array does not accept multidimensional arrays.");
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static_assert(is_constructible_v<_Ty, _Ty&>, "N4950 [array.creation]/1: "
"to_array requires copy constructible elements.");
return _To_array_lvalue_impl(_Array, make_index_sequence<_Size>{});
return _STD _To_array_lvalue_impl(_Array, make_index_sequence<_Size>{});
}

_EXPORT_STD template <class _Ty, size_t _Size>
Expand All @@ -843,7 +843,7 @@ _NODISCARD constexpr array<remove_cv_t<_Ty>, _Size> to_array(_Ty (&&_Array)[_Siz
"to_array does not accept multidimensional arrays.");
static_assert(is_move_constructible_v<_Ty>, "N4950 [array.creation]/4: "
"to_array requires move constructible elements.");
return _To_array_rvalue_impl(_STD move(_Array), make_index_sequence<_Size>{});
return _STD _To_array_rvalue_impl(_STD move(_Array), make_index_sequence<_Size>{});
}
#endif // _HAS_CXX20

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13 changes: 13 additions & 0 deletions tests/std/tests/P0325R4_to_array/test.cpp
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Expand Up @@ -53,6 +53,19 @@ void assert_not_constexpr() {
assert_equal(to_array({"cats"s, "go"s, "meow"s}), array<string, 3>{"cats", "go", "meow"});
}

struct incomplete;

template <class T>
struct holder {
T t;
};

void test_adl_proof() { // COMPILE-ONLY
holder<incomplete>* a[1]{};
(void) std::to_array(a); // intentionally qualified to avoid ADL
(void) std::to_array(std::move(a)); // intentionally qualified to avoid ADL
}

int main() {
assert(assert_constexpr());
static_assert(assert_constexpr());
Expand Down