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[libc++] Complete overhaul of constexpr support in std::array
This commit adds missing support for constexpr in std::array under all standard modes up to and including C++20. It also transforms the <array> tests to check for constexpr-friendliness under the right standard modes. Fixes https://llvm.org/PR40124 Fixes rdar://57522096 Supersedes https://reviews.llvm.org/D60666 Differential Revision: https://reviews.llvm.org/D80452
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libcxx/test/std/containers/sequences/array/aggregate.pass.cpp
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| //===----------------------------------------------------------------------===// | ||
| // | ||
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
| // See https://llvm.org/LICENSE.txt for license information. | ||
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| // Make sure std::array is an aggregate type. | ||
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| #include <array> | ||
| #include <type_traits> | ||
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| template <typename T> | ||
| void tests() | ||
| { | ||
| // Test aggregate initialization | ||
| { | ||
| std::array<T, 0> a0 = {}; (void)a0; | ||
| std::array<T, 1> a1 = {T()}; (void)a1; | ||
| std::array<T, 2> a2 = {T(), T()}; (void)a2; | ||
| std::array<T, 3> a3 = {T(), T(), T()}; (void)a3; | ||
| } | ||
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| // Test the is_aggregate trait. | ||
| #if TEST_STD_VER >= 17 // The trait is only available in C++17 and above | ||
| static_assert(std::is_aggregate<std::array<T, 0> >::value, ""); | ||
| static_assert(std::is_aggregate<std::array<T, 1> >::value, ""); | ||
| static_assert(std::is_aggregate<std::array<T, 2> >::value, ""); | ||
| static_assert(std::is_aggregate<std::array<T, 3> >::value, ""); | ||
| static_assert(std::is_aggregate<std::array<T, 4> >::value, ""); | ||
| #endif | ||
| } | ||
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| struct Empty { }; | ||
| struct NonEmpty { int i; int j; }; | ||
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| int main(int, char**) | ||
| { | ||
| tests<char>(); | ||
| tests<int>(); | ||
| tests<long>(); | ||
| tests<float>(); | ||
| tests<double>(); | ||
| tests<long double>(); | ||
| tests<NonEmpty>(); | ||
| tests<Empty>(); | ||
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| return 0; | ||
| } |
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