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// -*- C++ -*-
//===------------------------------ span ---------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===---------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
// <span>
// template<class ElementType, ptrdiff_t Extent = dynamic_extent>
// class span {
// public:
// // constants and types
// using element_type = ElementType;
// using value_type = remove_cv_t<ElementType>;
// using index_type = ptrdiff_t;
// using difference_type = ptrdiff_t;
// using pointer = element_type *;
// using reference = 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 index_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 Iter>
void testConstIterator()
{
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);
// I'd like to say 'const typename S::pointer' here, but that gives me
// a const pointer to a non-const value, which is not what I want.
ASSERT_SAME_TYPE(typename ItT::reference, typename S::element_type const &);
ASSERT_SAME_TYPE(typename ItT::pointer, typename S::element_type const *);
ASSERT_SAME_TYPE(typename ItT::difference_type, typename S::difference_type);
}
template <typename S, typename ElementType, std::ptrdiff_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::index_type, std::ptrdiff_t);
ASSERT_SAME_TYPE(typename S::difference_type, std::ptrdiff_t);
ASSERT_SAME_TYPE(typename S::pointer, ElementType *);
ASSERT_SAME_TYPE(typename S::reference, ElementType &);
static_assert(S::extent == Size); // check that it exists
testIterator<S, typename S::iterator>();
testIterator<S, typename S::reverse_iterator>();
testConstIterator<S, typename S::const_iterator>();
testConstIterator<S, typename S::const_reverse_iterator>();
}
template <typename T>
void test()
{
testSpan<std::span< T>, T, -1>();
testSpan<std::span<const T>, const T, -1>();
testSpan<std::span< volatile T>, volatile T, -1>();
testSpan<std::span<const volatile T>, const volatile T, -1>();
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 ()
{
test<int>();
test<long>();
test<double>();
test<std::string>();
test<A>();
}
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