//===----------------------------------------------------------------------===//
//
// 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>
// template<class ElementType, size_t Extent = dynamic_extent>
// class span {
// public:
// // constants and types
// using element_type = ElementType;
// using value_type = remove_cv_t<ElementType>;
// using size_type = size_t;
// using difference_type = ptrdiff_t;
// using pointer = element_type *;
// using reference = element_type &;
// using const_pointer = const element_type *;
// using const_reference = const element_type &;
// using iterator = implementation-defined;
// using const_iterator = implementation-defined;
// using reverse_iterator = std::reverse_iterator<iterator>;
// using const_reverse_iterator = std::reverse_iterator<const_iterator>;
//
// static constexpr size_type extent = Extent;
//
#include <span>
#include <cassert>
#include <iterator>
#include <string>
#include "test_macros.h"
template <typename S, typename Iter>
void testIterator()
{
typedef std::iterator_traits<Iter> ItT;
ASSERT_SAME_TYPE(typename ItT::iterator_category, std::random_access_iterator_tag);
ASSERT_SAME_TYPE(typename ItT::value_type, typename S::value_type);
ASSERT_SAME_TYPE(typename ItT::reference, typename S::reference);
ASSERT_SAME_TYPE(typename ItT::pointer, typename S::pointer);
ASSERT_SAME_TYPE(typename ItT::difference_type, typename S::difference_type);
}
template <typename S, typename ElementType, std::size_t Size>
void testSpan()
{
ASSERT_SAME_TYPE(typename S::element_type, ElementType);
ASSERT_SAME_TYPE(typename S::value_type, std::remove_cv_t<ElementType>);
ASSERT_SAME_TYPE(typename S::size_type, std::size_t);
ASSERT_SAME_TYPE(typename S::difference_type, std::ptrdiff_t);
ASSERT_SAME_TYPE(typename S::pointer, ElementType *);
ASSERT_SAME_TYPE(typename S::const_pointer, const ElementType *);
ASSERT_SAME_TYPE(typename S::reference, ElementType &);
ASSERT_SAME_TYPE(typename S::const_reference, const ElementType &);
static_assert(S::extent == Size); // check that it exists
testIterator<S, typename S::iterator>();
testIterator<S, typename S::reverse_iterator>();
}
template <typename T>
void test()
{
testSpan<std::span< T>, T, std::dynamic_extent>();
testSpan<std::span<const T>, const T, std::dynamic_extent>();
testSpan<std::span< volatile T>, volatile T, std::dynamic_extent>();
testSpan<std::span<const volatile T>, const volatile T, std::dynamic_extent>();
testSpan<std::span< T, 5>, T, 5>();
testSpan<std::span<const T, 5>, const T, 5>();
testSpan<std::span< volatile T, 5>, volatile T, 5>();
testSpan<std::span<const volatile T, 5>, const volatile T, 5>();
}
struct A{};
int main(int, char**)
{
test<int>();
test<long>();
test<double>();
test<std::string>();
test<A>();
return 0;
}