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// Copyright (C) 2019-2023 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }
#include <ranges>
#include <span>
#include <string>
#include <experimental/string_view>
template<typename T>
constexpr bool
rvalue_is_borrowed_range()
{
using std::ranges::borrowed_range;
// An lvalue range always models borrowed_range
static_assert( borrowed_range<T&> );
static_assert( borrowed_range<const T&> );
// Result should not depend on addition of const or rvalue-reference.
static_assert( borrowed_range<T&&> == borrowed_range<T> );
static_assert( borrowed_range<const T> == borrowed_range<T> );
static_assert( borrowed_range<const T&&> == borrowed_range<T> );
return std::ranges::borrowed_range<T>;
}
static_assert( rvalue_is_borrowed_range<std::ranges::subrange<int*, int*>>() );
static_assert( rvalue_is_borrowed_range<std::ranges::empty_view<int>>() );
static_assert( rvalue_is_borrowed_range<std::ranges::iota_view<int>>() );
static_assert( rvalue_is_borrowed_range<std::ranges::iota_view<int, int>>() );
static_assert( rvalue_is_borrowed_range<std::span<int>>() );
static_assert( rvalue_is_borrowed_range<std::span<int, 99>>() );
static_assert( ! rvalue_is_borrowed_range<std::string>() );
static_assert( ! rvalue_is_borrowed_range<std::wstring>() );
static_assert( rvalue_is_borrowed_range<std::string_view>() );
static_assert( rvalue_is_borrowed_range<std::wstring_view>() );
static_assert( rvalue_is_borrowed_range<std::experimental::string_view>() );
static_assert( rvalue_is_borrowed_range<std::experimental::wstring_view>() );
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