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[libc++] Fix PR35491 - std::array of zero-size doesn't work with non-default constructible types.

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Summary:
This patch fixes llvm.org/PR35491 and LWG2157  (https://cplusplus.github.io/LWG/issue2157)

The fix attempts to maintain ABI compatibility by replacing the array with a instance of `aligned_storage`.

Reviewers: mclow.lists, EricWF

Reviewed By: EricWF

Subscribers: lichray, cfe-commits

Differential Revision: https://reviews.llvm.org/D41223

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@324182 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2018-02-04 01:03:08 +00:00
parent b173b26b9e
commit f3224ac007
5 changed files with 106 additions and 16 deletions
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10
test/std/containers/sequences/array/array.data/data_const.pass.cpp
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@@ -38,6 +38,16 @@ int main()
const T* p = c.data();
(void)p; // to placate scan-build
}
{
struct NoDefault {
NoDefault(int) {}
};
typedef NoDefault T;
typedef std::array<T, 0> C;
const C c = {};
const T* p = c.data();
assert(p != nullptr);
}
#if TEST_STD_VER > 14
{
typedef std::array<int, 5> C;