//===---------------------------------------------------------------------===//
//
// 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 R>
// constexpr explicit(Extent != dynamic_extent) span(R&& r);
#include <span>
#include <cassert>
#include <ranges>
#include <string_view>
#include <type_traits>
#include <vector>
#include "test_iterators.h"
template <class T, std::size_t Extent>
constexpr void test_from_range() {
T val[3]{};
std::span<T, Extent> s{val};
assert(s.size() == std::size(val));
assert(s.data() == std::data(val));
}
struct A {};
constexpr bool test() {
test_from_range<int, std::dynamic_extent>();
test_from_range<int, 3>();
test_from_range<A, std::dynamic_extent>();
test_from_range<A, 3>();
return true;
}
static_assert(!std::is_constructible_v<std::span<int>, std::vector<float>&>); // wrong type
static_assert(!std::is_constructible_v<std::span<int, 3>, std::vector<float>&>); // wrong type
static_assert(std::is_constructible_v<std::span<int>, std::vector<int>&>); // non-borrowed lvalue
static_assert(std::is_constructible_v<std::span<int, 3>, std::vector<int>&>); // non-borrowed lvalue
static_assert(std::is_constructible_v<std::span<const int>, std::vector<int>&>); // non-borrowed lvalue
static_assert(std::is_constructible_v<std::span<const int, 3>, std::vector<int>&>); // non-borrowed lvalue
static_assert(!std::is_constructible_v<std::span<int>, const std::vector<int>&>); // non-borrowed const lvalue
static_assert(!std::is_constructible_v<std::span<int, 3>, const std::vector<int>&>); // non-borrowed const lvalue
static_assert(std::is_constructible_v<std::span<const int>, const std::vector<int>&>); // non-borrowed const lvalue
static_assert(std::is_constructible_v<std::span<const int, 3>, const std::vector<int>&>); // non-borrowed const lvalue
static_assert(std::is_constructible_v<std::span<const int>, std::vector<int>>); // non-borrowed rvalue
static_assert(std::is_constructible_v<std::span<const int, 3>, std::vector<int>>); // non-borrowed rvalue
static_assert(!std::is_constructible_v<std::span<int>, std::vector<int>&&>); // non-borrowed rvalue
static_assert(!std::is_constructible_v<std::span<int, 3>, std::vector<int>&&>); // non-borrowed rvalue
static_assert(std::is_constructible_v<std::span<int>, std::ranges::subrange<contiguous_iterator<int*>>>); // contiguous borrowed rvalue
static_assert(std::is_constructible_v<std::span<int, 3>, std::ranges::subrange<contiguous_iterator<int*>>>); // contiguous borrowed rvalue
static_assert(!std::is_constructible_v<std::span<int>, std::ranges::subrange<random_access_iterator<int*>>>); // non-contiguous borrowed rvalue
static_assert(!std::is_constructible_v<std::span<int, 3>, std::ranges::subrange<random_access_iterator<int*>>>); // non-contiguous borrowed rvalue
using BorrowedContiguousSizedRange = std::string_view;
static_assert(std::is_constructible_v<std::span<const char>, BorrowedContiguousSizedRange>);
static_assert(std::is_constructible_v<std::span<const char, 3>, BorrowedContiguousSizedRange>);
static_assert(!std::is_constructible_v<std::span<char>, BorrowedContiguousSizedRange>);
static_assert(!std::is_constructible_v<std::span<char, 3>, BorrowedContiguousSizedRange>);
static_assert(std::is_convertible_v<BorrowedContiguousSizedRange&, std::span<const char>>);
static_assert(!std::is_convertible_v<BorrowedContiguousSizedRange&, std::span<const char, 3>>);
static_assert(!std::is_convertible_v<BorrowedContiguousSizedRange&, std::span<char>>);
static_assert(!std::is_convertible_v<BorrowedContiguousSizedRange&, std::span<char, 3>>);
static_assert(std::is_convertible_v<const BorrowedContiguousSizedRange&, std::span<const char>>);
static_assert(!std::is_convertible_v<const BorrowedContiguousSizedRange&, std::span<const char, 3>>);
int main(int, char**) {
test();
static_assert(test());
return 0;
}