| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // UNSUPPORTED: c++03, c++11, c++14, c++17, c++20 |
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| 9 | |
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| 10 | // <mdspan> |
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| 11 | |
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| 12 | // Test construction from integral: |
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| 13 | // |
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| 14 | // template<class ... OtherIndexTypes> |
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| 15 | // constexpr explicit extents(OtherIndexTypes ... exts) noexcept; |
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| 16 | // |
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| 17 | // Let N be sizeof...(OtherIndexTypes), and let |
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| 18 | // exts_arr be array<index_type, N>{static_cast<index_type>(std::move(exts))...}. |
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| 19 | // |
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| 20 | // Constraints: |
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| 21 | // * (is_convertible_v<OtherIndexTypes, index_type> && ...) is true, |
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| 22 | // * (is_nothrow_constructible_v<index_type, OtherIndexType> && ...) is true, and |
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| 23 | // * N == rank_dynamic() || N == rank() is true. |
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| 24 | // |
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| 25 | // Preconditions: |
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| 26 | // * If N != rank_dynamic() is true, exts_arr[r] equals Er for each r for which |
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| 27 | // Er is a static extent, and |
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| 28 | // * either |
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| 29 | // - sizeof...(exts) == 0 is true, or |
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| 30 | // - each element of exts is nonnegative and is representable as a value of type index_type. |
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| 31 | // |
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| 32 | |
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| 33 | #include <mdspan> |
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| 34 | #include <cassert> |
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| 35 | #include <type_traits> |
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| 36 | |
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| 37 | #include "../ConvertibleToIntegral.h" |
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| 38 | #include "CtorTestCombinations.h" |
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| 39 | #include "test_macros.h" |
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| 40 | |
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| 41 | struct IntegralCtorTest { |
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| 42 | template <class E, class AllExtents, class Extents, size_t... Indices> |
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| 43 | static constexpr void test_construction(AllExtents all_ext, Extents ext, std::index_sequence<Indices...>) { |
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| 44 | // construction from indices |
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| 45 | ASSERT_NOEXCEPT(E(ext[Indices]...)); |
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| 46 | test_runtime_observers(E(ext[Indices]...), all_ext); |
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| 47 | } |
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| 48 | }; |
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| 49 | |
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| 50 | int main(int, char**) { |
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| 51 | test_index_type_combo<IntegralCtorTest>(); |
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| 52 | static_assert(test_index_type_combo<IntegralCtorTest>()); |
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| 53 | |
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| 54 | constexpr size_t D = std::dynamic_extent; |
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| 55 | using E = std::extents<int, 1, D, 3, D>; |
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| 56 | |
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| 57 | // check can't construct from too few arguments |
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| 58 | static_assert(!std::is_constructible_v<E, int>, "extents constructible from illegal arguments" ); |
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| 59 | // check can't construct from rank_dynamic < #args < rank |
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| 60 | static_assert(!std::is_constructible_v<E, int, int, int>, "extents constructible from illegal arguments" ); |
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| 61 | // check can't construct from too many arguments |
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| 62 | static_assert(!std::is_constructible_v<E, int, int, int, int, int>, "extents constructible from illegal arguments" ); |
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| 63 | |
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| 64 | // test construction fails from types not convertible to index_type but convertible to other integer types |
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| 65 | static_assert(std::is_convertible_v<IntType, int>, "Test helper IntType unexpectedly not convertible to int" ); |
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| 66 | static_assert(!std::is_constructible_v< std::extents<unsigned long, D>, IntType>, |
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| 67 | "extents constructible from illegal arguments" ); |
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| 68 | return 0; |
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| 69 | } |
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| 70 | |
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