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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::size));
void
test01()
{
constexpr int a[10] = { };
static_assert( std::ranges::size(a) == 10 );
static_assert( noexcept(std::ranges::size(a)) );
int a2[2];
VERIFY( std::ranges::size(a2) == 2);
static_assert( noexcept(std::ranges::size(a2)) );
struct Incomplete;
using A = Incomplete[2]; // bounded array of incomplete type
extern A& f();
static_assert( std::same_as<decltype(std::ranges::size(f())), std::size_t> );
}
void
test02()
{
struct R
{
int size() { return 1; }
long size() const noexcept { return 2; }
};
R r;
const R& c = r;
VERIFY( std::ranges::size(r) == 1 );
static_assert( !noexcept(std::ranges::size(r)) );
VERIFY( std::ranges::size(c) == 2L );
static_assert( noexcept(std::ranges::size(c)) );
int a[3] = { };
__gnu_test::test_sized_range<int, __gnu_test::input_iterator_wrapper> ri(a);
VERIFY( std::ranges::size(ri) == 3 );
static_assert( noexcept(std::ranges::size(ri)) );
}
struct R3
{
int* size() { return nullptr; }
friend int size(R3&) noexcept { return 1; }
friend long size(const R3&) { return 2L; }
friend unsigned int size(R3&&) { return 3U; }
friend unsigned long size(const R3&&) noexcept { return 4UL; }
};
void
test03()
{
R3 r;
const R3& c = r;
VERIFY( std::ranges::size(r) == 1 );
static_assert( noexcept(std::ranges::size(r)) );
// PR libstdc++/100824
// ranges::size should treat the subexpression as an lvalue
VERIFY( std::ranges::size(std::move(r)) == 1 );
static_assert( noexcept(std::ranges::size(std::move(r))) );
VERIFY( std::ranges::size(c) == 2L );
static_assert( !noexcept(std::ranges::size(c)) );
VERIFY( std::ranges::size(std::move(c)) == 2L );
static_assert( !noexcept(std::ranges::size(std::move(c))) );
}
void
test04()
{
int a[] = { 0, 1 };
__gnu_test::test_range<int, __gnu_test::random_access_iterator_wrapper> r(a);
VERIFY( std::ranges::size(r) == unsigned(std::ranges::end(r) - std::ranges::begin(r)) );
}
struct R5
{
int size() const noexcept { return 0; }
R5* begin() { return this; }
R5* end() { return this + 1; }
};
template<>
constexpr bool std::ranges::disable_sized_range<R5> = true;
void
test05()
{
R5 r;
VERIFY( std::ranges::size(r) == 1 );
}
void
test06()
{
// PR libstdc++/100824
// ranges::size should treat the subexpression as an lvalue
struct R { constexpr int size() & { return 42; } };
static_assert( std::ranges::size(R{}) == 42 );
}
template<typename T>
concept has_size = requires (T& t) { std::ranges::size(t); };
// If T is an array of unknown bound, ranges::size(E) is ill-formed.
static_assert( ! has_size<int[]> );
static_assert( ! has_size<int(&)[]> );
static_assert( ! has_size<int[][2]> );
struct Incomplete;
static_assert( ! has_size<Incomplete[]> );
int
main()
{
test01();
test02();
test03();
test04();
test05();
test06();
}
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