99696b35bc
Trying to copy-construct a std::span from another std::span holding an incomplete type would fail as we evaluate the SFINAE for the range-based constructor. The problem was that we checked for __is_std_span after checking for the range being a contiguous_range, which hard-errored because of arithmetic on a pointer to incomplete type. As a drive-by, refactor the whole test and format it. Fixes #104496
116 lines
2.5 KiB
C++
116 lines
2.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// <span>
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// constexpr span(const span& other) noexcept = default;
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#include <span>
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#include <cassert>
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#include <string>
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#include <utility>
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#include "test_macros.h"
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template <class T>
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constexpr void test() {
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ASSERT_NOEXCEPT(std::span<T>(std::declval<std::span<T> const&>()));
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ASSERT_NOEXCEPT(std::span<T>{std::declval<std::span<T> const&>()});
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// dynamic_extent
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{
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std::span<T> x;
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std::span<T> copy(x);
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assert(copy.data() == x.data());
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assert(copy.size() == x.size());
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}
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{
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T array[3] = {};
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std::span<T> x(array, 3);
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std::span<T> copy(x);
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assert(copy.data() == array);
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assert(copy.size() == 3);
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}
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{
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T array[3] = {};
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std::span<T> x(array, 2);
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std::span<T> copy(x);
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assert(copy.data() == array);
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assert(copy.size() == 2);
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}
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// static extent
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{
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std::span<T, 0> x;
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std::span<T, 0> copy(x);
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assert(copy.data() == x.data());
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assert(copy.size() == x.size());
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}
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{
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T array[3] = {};
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std::span<T, 3> x(array);
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std::span<T, 3> copy(x);
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assert(copy.data() == array);
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assert(copy.size() == 3);
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}
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{
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T array[2] = {};
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std::span<T, 2> x(array);
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std::span<T, 2> copy(x);
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assert(copy.data() == array);
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assert(copy.size() == 2);
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}
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}
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struct Foo {};
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constexpr bool test_all() {
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test<int>();
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test<const int>();
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test<volatile int>();
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test<const volatile int>();
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test<long>();
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test<const long>();
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test<volatile long>();
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test<const volatile long>();
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test<double>();
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test<const double>();
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test<volatile double>();
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test<const volatile double>();
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// Note: Can't test non-fundamental types with volatile because we require `T*` to be indirectly_readable,
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// which isn't the case when T is volatile.
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test<Foo>();
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test<const Foo>();
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test<std::string>();
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test<const std::string>();
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// Regression test for https://github.com/llvm/llvm-project/issues/104496
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{
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struct Incomplete;
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std::span<Incomplete> x;
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std::span<Incomplete> copy(x);
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assert(copy.data() == x.data());
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assert(copy.size() == x.size());
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}
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return true;
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}
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int main(int, char**) {
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test_all();
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static_assert(test_all());
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return 0;
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}
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