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// Copyright (C) 2020-2022 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 <algorithm>
#include <array>
#include <ranges>
#include <vector>
#include <testsuite_hooks.h>
#include <testsuite_iterators.h>
namespace ranges = std::ranges;
namespace views = std::ranges::views;
void
test01()
{
int x[] = {1,2,3,4,5};
auto v = views::all(x);
static_assert(ranges::view<decltype(v)>);
static_assert(ranges::random_access_range<decltype(v)>);
VERIFY( ranges::size(v) == 5 );
VERIFY( ranges::size(x | views::all) == 5 );
VERIFY( ranges::size(v | views::all | views::all) == 5 );
VERIFY( ranges::size(v | (views::all | views::all)) == 5 );
ranges::reverse(v);
VERIFY( ranges::equal(v, (int[]){5,4,3,2,1}) );
}
void
test02()
{
int x[5] = { 0 };
int k = 0;
for (auto&& i : ranges::ref_view{x})
i += ++k;
VERIFY( ranges::equal(x, (int[]){1,2,3,4,5}) );
}
constexpr bool
test03()
{
std::array ints{0,1,2,3,4,5};
auto even = [] (int i) { return i%2==0; };
auto odd = [] (int i) { return i%2==1; };
auto square = [] (int i) { return i*i; };
int sum = 0;
for (auto v : (ints
| (views::all
| (views::filter(even)
| (views::filter(odd) | views::all)))
| views::transform(square)))
sum += v;
return sum == 0;
}
constexpr bool
test04()
{
auto odd = [] (int i) { return i%2==1; };
auto square = [] (int i) { return i*i; };
auto increment = [] (int i) { return i+1; };
auto small = [] (int i) { return i<30; };
auto non_negative = [] (int i) { return i>=0; };
auto negative = [] (int i) { return i<0; };
return ranges::equal(views::iota(-5)
| views::drop_while(negative)
| views::take_while(non_negative)
| views::transform(increment)
| views::filter(odd)
| views::take(3)
| views::all
| views::transform(square),
views::iota(-5)
| views::drop_while(negative)
| views::drop(1)
| views::filter(odd)
| views::transform(square)
| views::take_while(small)
| views::take_while(small));
}
static_assert(std::is_empty_v<decltype(views::common
| views::join
| views::all
| views::common
| views::keys
| views::reverse)>);
#if 0
// Adding empty range adaptor closure objects to a pipeline used to not
// increase the size of the pipeline, but now that our range adaptor closure
// objects derive from a common empty base class, [[no_unique_address]] can no
// longer make two empty adjacent range adaptor closure objects occupy the same
// data member address.
static_assert(sizeof(decltype(views::take(5) | views::drop(5)))
== sizeof(decltype(views::take(5)
| views::join
| views::common
| views::all
| views::keys
| views::drop(5)
| views::reverse)));
#endif
template<auto all = views::all>
void
test05()
{
// Verify SFINAE behavior.
static_assert(!requires { all(); });
static_assert(!requires { all(0, 0); });
static_assert(!requires { all(0); });
static_assert(!requires { 0 | all; });
}
void
test06()
{
int x[] { 1, 2, 3 };
// Using ref_view:
static_assert(noexcept(views::all(x)));
// Using owning_view:
static_assert(noexcept(views::all(std::array<int, 3>{})));
struct A { A(); A(const A&); };
static_assert(!std::is_nothrow_move_constructible_v<std::array<A, 3>>);
static_assert(!noexcept(views::all(std::array<A, 3>{})));
}
void
test07()
{
// LWG 3481
struct view_t : ranges::empty_view<int> { // move-only view
view_t(const view_t&) = delete;
view_t(view_t&&) = default;
view_t& operator=(const view_t&) = delete;
view_t& operator=(view_t&&) = default;
};
static_assert(std::movable<view_t> && !std::copyable<view_t>);
static_assert(!ranges::viewable_range<view_t&>);
}
constexpr bool
test08()
{
#ifdef _GLIBCXX_DEBUG
using std::_GLIBCXX_STD_C::vector;
#else
using std::vector;
#endif
// Verify P2415R2 "What is a view?" changes.
// In particular, rvalue non-view non-borrowed ranges are now viewable.
static_assert(ranges::viewable_range<vector<int>&&>);
static_assert(!ranges::viewable_range<const vector<int>&&>);
static_assert(ranges::viewable_range<std::initializer_list<int>&>);
static_assert(ranges::viewable_range<const std::initializer_list<int>&>);
static_assert(!ranges::viewable_range<std::initializer_list<int>&&>);
static_assert(!ranges::viewable_range<const std::initializer_list<int>&&>);
using type = views::all_t<vector<int>&&>;
using type = ranges::owning_view<vector<int>>;
std::same_as<type> auto v = vector<int>{{1,2,3}} | views::all;
VERIFY( ranges::equal(v, (int[]){1,2,3}) );
VERIFY( ranges::size(v) == 3 );
VERIFY( !ranges::empty(v) );
VERIFY( ranges::data(v) == &v[0] );
const auto w = std::move(v);
VERIFY( ranges::equal(w, (int[]){1,2,3}) );
VERIFY( ranges::size(w) == 3 );
VERIFY( !ranges::empty(w) );
VERIFY( ranges::data(w) == &w[0] );
return true;
}
int
main()
{
test01();
test02();
static_assert(test03());
static_assert(test04());
test05();
test06();
test07();
static_assert(test08());
}
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