mirror of
https://github.com/llvm/llvm-project.git
synced 2025-05-03 13:46:06 +00:00
cb950c9dc9
We did not mark std::begin/std::end as noexcept for C-style arrays, we did not have conditional noexcept on cbegin/cend, and we did not mark array cbegin/cend as constexpr in all Standard modes. Since this is a LWG issue, we should implement it as a DR in all Standard modes as usual. This patch fixes these issues and adds test coverage. Fixes #67471.
97 lines
2.8 KiB
C++
97 lines
2.8 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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
|
|
|
|
// <iterator>
|
|
//
|
|
// template <class T, size_t N> constexpr T* begin(T (&array)[N]) noexcept;
|
|
// template <class T, size_t N> constexpr T* end(T (&array)[N]) noexcept;
|
|
//
|
|
// template <class T, size_t N> constexpr reverse_iterator<T*> rbegin(T (&array)[N]); // C++14, constexpr since C++17
|
|
// template <class T, size_t N> constexpr reverse_iterator<T*> rend(T (&array)[N]); // C++14, constexpr since C++17
|
|
|
|
#include <cassert>
|
|
#include <iterator>
|
|
|
|
#include "test_macros.h"
|
|
|
|
TEST_CONSTEXPR_CXX14 bool test() {
|
|
int a[] = {1, 2, 3};
|
|
const auto& ca = a;
|
|
|
|
// std::begin(T (&)[N]) / std::end(T (&)[N])
|
|
{
|
|
ASSERT_NOEXCEPT(std::begin(a));
|
|
ASSERT_SAME_TYPE(decltype(std::begin(a)), int*);
|
|
assert(std::begin(a) == a);
|
|
|
|
ASSERT_NOEXCEPT(std::end(a));
|
|
ASSERT_SAME_TYPE(decltype(std::end(a)), int*);
|
|
assert(std::end(a) == a + 3);
|
|
|
|
// kind of overkill since it follows from the definition, but worth testing
|
|
ASSERT_NOEXCEPT(std::begin(ca));
|
|
ASSERT_SAME_TYPE(decltype(std::begin(ca)), const int*);
|
|
assert(std::begin(ca) == ca);
|
|
|
|
ASSERT_NOEXCEPT(std::end(ca));
|
|
ASSERT_SAME_TYPE(decltype(std::end(ca)), const int*);
|
|
assert(std::end(ca) == ca + 3);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
TEST_CONSTEXPR_CXX17 bool test_r() {
|
|
#if TEST_STD_VER >= 14
|
|
int a[] = {1, 2, 3};
|
|
const auto& ca = a;
|
|
|
|
// std::rbegin(T (&)[N]) / std::rend(T (&)[N])
|
|
{
|
|
ASSERT_SAME_TYPE(decltype(std::rbegin(a)), std::reverse_iterator<int*>);
|
|
assert(std::rbegin(a).base() == a + 3);
|
|
|
|
ASSERT_SAME_TYPE(decltype(std::rend(a)), std::reverse_iterator<int*>);
|
|
assert(std::rend(a).base() == a);
|
|
|
|
// kind of overkill since it follows from the definition, but worth testing
|
|
ASSERT_SAME_TYPE(decltype(std::rbegin(ca)), std::reverse_iterator<const int*>);
|
|
assert(std::rbegin(ca).base() == ca + 3);
|
|
|
|
ASSERT_SAME_TYPE(decltype(std::rend(ca)), std::reverse_iterator<const int*>);
|
|
assert(std::rend(ca).base() == ca);
|
|
}
|
|
#endif
|
|
|
|
return true;
|
|
}
|
|
|
|
int main(int, char**) {
|
|
test();
|
|
test_r();
|
|
#if TEST_STD_VER >= 14
|
|
static_assert(test(), "");
|
|
#endif
|
|
#if TEST_STD_VER >= 17
|
|
static_assert(test_r(), "");
|
|
#endif
|
|
|
|
// Make sure std::begin(T (&)[N]) and std::end(T (&)[N]) are constexpr in C++11 too (see LWG2280).
|
|
{
|
|
static constexpr int a[] = {1, 2, 3};
|
|
constexpr auto b = std::begin(a);
|
|
assert(b == a);
|
|
constexpr auto e = std::end(a);
|
|
assert(e == a + 3);
|
|
}
|
|
|
|
return 0;
|
|
}
|