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// Copyright (C) 2019-2022 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 run { target c++2a } }
#include <ranges>
#include <testsuite_hooks.h>
#include <testsuite_iterators.h>
static_assert(__gnu_test::is_customization_point_object(std::ranges::cdata));
template<typename T>
concept has_cdata
= requires (T&& t) { std::ranges::cdata(std::forward<T>(t)); };
void
test01()
{
struct R
{
int i = 0;
int j = 0;
int* data() { return &j; }
const R* data() const noexcept { return nullptr; }
};
static_assert( has_cdata<R&> );
static_assert( has_cdata<const R&> );
R r;
const R& c = r;
VERIFY( std::ranges::cdata(r) == (R*)nullptr );
static_assert( noexcept(std::ranges::cdata(r)) );
VERIFY( std::ranges::cdata(c) == (R*)nullptr );
static_assert( noexcept(std::ranges::cdata(c)) );
// not lvalues and not borrowed ranges
static_assert( !has_cdata<R> );
static_assert( !has_cdata<const R> );
}
void
test02()
{
int a[] = { 0, 1 };
VERIFY( std::ranges::cdata(a) == a + 0 );
static_assert( has_cdata<int(&)[2]> );
static_assert( !has_cdata<int(&&)[2]> );
}
struct R3
{
static inline int i = 0;
static inline long l = 0;
int* data() &; // this function is not defined
friend long* begin(R3&& r); // not defined
friend const long* begin(const R3& r) { return &r.l; }
friend const short* begin(const R3&&); // not defined
};
template<> constexpr bool std::ranges::enable_borrowed_range<R3> = true;
void
test03()
{
static_assert( has_cdata<R3&> );
static_assert( has_cdata<R3> ); // borrowed range
static_assert( has_cdata<const R3&> );
static_assert( has_cdata<const R3> ); // borrowed range
R3 r;
const R3& c = r;
VERIFY( std::ranges::cdata(r) == std::ranges::data(c) );
VERIFY( std::ranges::cdata(std::move(r)) == std::ranges::data(c) );
VERIFY( std::ranges::cdata(std::move(c)) == std::ranges::begin(c) );
}
int
main()
{
test01();
test02();
test03();
}
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