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Differential D127418 Diff 439482 libcxx/test/libcxx/containers/views/views.span/span.sub/assert.subspan.pass.cpp

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libcxx/test/libcxx/containers/views/views.span/span.sub/assert.subspan.pass.cpp

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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// <span>
//
// constexpr span<element_type, dynamic_extent> subspan(
// size_type offset, size_type count = dynamic_extent) const;
//
// Requires: (0 <= Offset && Offset <= size())
// && (Count == dynamic_extent || Count >= 0 && Offset + Count <= size())
// Make sure that creating a sub-span with an incorrect number of elements triggers an assertion.
// REQUIRES: has-unix-headers
// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9|10.10|10.11|10.12|10.13|10.14|10.15|11.0|12.0}}
// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1
#include <array>
#include <span>
#include <cstddef>
#include "check_assertion.h"
int main(int, char**) {
{
std::array<int, 3> array{0, 1, 2};
std::span<int> const s(array.data(), array.size());
TEST_LIBCPP_ASSERT_FAILURE(s.subspan(4), "span<T>::subspan(offset, count): offset out of range");
TEST_LIBCPP_ASSERT_FAILURE(s.subspan<4>(), "span<T>::subspan<Offset, Count>(): Offset out of range");
TEST_LIBCPP_ASSERT_FAILURE(s.subspan(0, 4), "span<T>::subspan(offset, count): count out of range");
TEST_LIBCPP_ASSERT_FAILURE((s.subspan<0, 4>()), "span<T>::subspan<Offset, Count>(): Offset + Count out of range");
TEST_LIBCPP_ASSERT_FAILURE(s.subspan(1, 3), "span<T>::subspan(offset, count): offset + count out of range");
TEST_LIBCPP_ASSERT_FAILURE((s.subspan<1, 3>()), "span<T>::subspan<Offset, Count>(): Offset + Count out of range");
}
{
std::array<int, 3> array{0, 1, 2};
std::span<int, 3> const s(array.data(), array.size());
TEST_LIBCPP_ASSERT_FAILURE(s.subspan(4), "span<T, N>::subspan(offset, count): offset out of range");
// s.subspan<4>() caught at compile-time (tested elsewhere)
TEST_LIBCPP_ASSERT_FAILURE(s.subspan(0, 4), "span<T, N>::subspan(offset, count): count out of range");
// s.subspan<0, 4>() caught at compile-time (tested elsewhere)
TEST_LIBCPP_ASSERT_FAILURE(s.subspan(1, 3), "span<T, N>::subspan(offset, count): offset + count out of range");
// s.subspan<1, 3>() caught at compile-time (tested elsewhere)
}
return 0;
}