| 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 |
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| 9 | |
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| 10 | // <span> |
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| 11 | |
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| 12 | // template<class R> |
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| 13 | // constexpr explicit(Extent != dynamic_extent) span(R&& r); |
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| 14 | |
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| 15 | #include <span> |
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| 16 | #include <cassert> |
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| 17 | #include <ranges> |
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| 18 | #include <string_view> |
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| 19 | #include <type_traits> |
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| 20 | #include <vector> |
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| 21 | |
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| 22 | #include "test_iterators.h" |
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| 23 | |
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| 24 | template <class T, std::size_t Extent> |
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| 25 | constexpr void test_from_range() { |
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| 26 | T val[3]{}; |
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| 27 | std::span<T, Extent> s{val}; |
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| 28 | assert(s.size() == std::size(val)); |
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| 29 | assert(s.data() == std::data(val)); |
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| 30 | } |
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| 31 | |
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| 32 | struct A {}; |
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| 33 | |
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| 34 | constexpr bool test() { |
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| 35 | test_from_range<int, std::dynamic_extent>(); |
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| 36 | test_from_range<int, 3>(); |
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| 37 | test_from_range<A, std::dynamic_extent>(); |
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| 38 | test_from_range<A, 3>(); |
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| 39 | return true; |
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| 40 | } |
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| 41 | |
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| 42 | static_assert(!std::is_constructible_v<std::span<int>, std::vector<float>&>); // wrong type |
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| 43 | static_assert(!std::is_constructible_v<std::span<int, 3>, std::vector<float>&>); // wrong type |
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| 44 | |
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| 45 | static_assert(std::is_constructible_v<std::span<int>, std::vector<int>&>); // non-borrowed lvalue |
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| 46 | static_assert(std::is_constructible_v<std::span<int, 3>, std::vector<int>&>); // non-borrowed lvalue |
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| 47 | static_assert(std::is_constructible_v<std::span<const int>, std::vector<int>&>); // non-borrowed lvalue |
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| 48 | static_assert(std::is_constructible_v<std::span<const int, 3>, std::vector<int>&>); // non-borrowed lvalue |
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| 49 | static_assert(!std::is_constructible_v<std::span<int>, const std::vector<int>&>); // non-borrowed const lvalue |
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| 50 | static_assert(!std::is_constructible_v<std::span<int, 3>, const std::vector<int>&>); // non-borrowed const lvalue |
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| 51 | static_assert(std::is_constructible_v<std::span<const int>, const std::vector<int>&>); // non-borrowed const lvalue |
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| 52 | static_assert(std::is_constructible_v<std::span<const int, 3>, const std::vector<int>&>); // non-borrowed const lvalue |
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| 53 | static_assert(std::is_constructible_v<std::span<const int>, std::vector<int>>); // non-borrowed rvalue |
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| 54 | static_assert(std::is_constructible_v<std::span<const int, 3>, std::vector<int>>); // non-borrowed rvalue |
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| 55 | static_assert(!std::is_constructible_v<std::span<int>, std::vector<int>&&>); // non-borrowed rvalue |
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| 56 | static_assert(!std::is_constructible_v<std::span<int, 3>, std::vector<int>&&>); // non-borrowed rvalue |
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| 57 | |
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| 58 | static_assert(std::is_constructible_v<std::span<int>, |
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| 59 | std::ranges::subrange<contiguous_iterator<int*>>>); // contiguous borrowed rvalue |
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| 60 | static_assert(std::is_constructible_v<std::span<int, 3>, |
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| 61 | std::ranges::subrange<contiguous_iterator<int*>>>); // contiguous borrowed rvalue |
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| 62 | static_assert( |
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| 63 | !std::is_constructible_v<std::span<int>, |
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| 64 | std::ranges::subrange<random_access_iterator<int*>>>); // non-contiguous borrowed rvalue |
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| 65 | static_assert( |
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| 66 | !std::is_constructible_v<std::span<int, 3>, |
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| 67 | std::ranges::subrange<random_access_iterator<int*>>>); // non-contiguous borrowed rvalue |
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| 68 | |
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| 69 | using BorrowedContiguousSizedRange = std::string_view; |
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| 70 | static_assert(std::is_constructible_v<std::span<const char>, BorrowedContiguousSizedRange>); |
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| 71 | static_assert(std::is_constructible_v<std::span<const char, 3>, BorrowedContiguousSizedRange>); |
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| 72 | static_assert(!std::is_constructible_v<std::span<char>, BorrowedContiguousSizedRange>); |
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| 73 | static_assert(!std::is_constructible_v<std::span<char, 3>, BorrowedContiguousSizedRange>); |
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| 74 | |
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| 75 | static_assert(std::is_convertible_v<BorrowedContiguousSizedRange&, std::span<const char>>); |
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| 76 | static_assert(!std::is_convertible_v<BorrowedContiguousSizedRange&, std::span<const char, 3>>); |
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| 77 | static_assert(!std::is_convertible_v<BorrowedContiguousSizedRange&, std::span<char>>); |
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| 78 | static_assert(!std::is_convertible_v<BorrowedContiguousSizedRange&, std::span<char, 3>>); |
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| 79 | static_assert(std::is_convertible_v<const BorrowedContiguousSizedRange&, std::span<const char>>); |
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| 80 | static_assert(!std::is_convertible_v<const BorrowedContiguousSizedRange&, std::span<const char, 3>>); |
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| 81 | |
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| 82 | int main(int, char**) { |
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| 83 | test(); |
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| 84 | static_assert(test()); |
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| 85 | |
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| 86 | return 0; |
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| 87 | } |
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| 88 | |
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