| // 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 run { target c++2a } } |
| |
| #include <algorithm> |
| #include <ranges> |
| #include <testsuite_hooks.h> |
| |
| void |
| test01() |
| { |
| int vals[5] = { }; |
| int* out = vals; |
| for (int i : std::ranges::iota_view{1, 4}) |
| *out++ = i; |
| VERIFY(out == vals + 3); |
| VERIFY(vals[0] == 1); |
| VERIFY(vals[1] == 2); |
| VERIFY(vals[2] == 3); |
| VERIFY(vals[3] == 0); |
| } |
| |
| void |
| test02() |
| { |
| auto v = std::ranges::views::iota(4); |
| auto it = v.begin(); |
| VERIFY( *it == 4 ); |
| ++it; |
| VERIFY( *it == 5 ); |
| it++; |
| VERIFY( *it == 6 ); |
| } |
| |
| void |
| test03() |
| { |
| auto v = std::ranges::views::iota(10, 15); |
| auto it = v.begin(); |
| VERIFY( *it == 10 ); |
| it += 2; |
| VERIFY( *it == 12 ); |
| it += 2; |
| VERIFY( *it == 14 ); |
| ++it; |
| VERIFY( it == v.end() ); |
| } |
| |
| void |
| test04() |
| { |
| int x[] = {1,2,3}; |
| auto v = std::ranges::views::iota(std::counted_iterator(x, 3), |
| std::default_sentinel); |
| auto it = v.begin(); |
| VERIFY( (*it).base() == x ); |
| ++it; |
| VERIFY( (*it).base() == x+1 ); |
| ++it; |
| VERIFY( (*it).base() == x+2 ); |
| ++it; |
| VERIFY( it == v.end() ); |
| } |
| |
| // Verify we optimize away the 'bound' data member of an unbounded iota_view. |
| static_assert(sizeof(std::ranges::iota_view<char>) == 1); |
| |
| void |
| test05() |
| { |
| // PR libstdc++/100690 |
| int x[] = {42, 42, 42}; |
| auto r = std::views::iota(std::ranges::begin(x), std::ranges::cbegin(x) + 3); |
| VERIFY( r.end() - r.begin() == 3 ); |
| VERIFY( r.begin() - r.end() == -3 ); |
| } |
| |
| void |
| test06() |
| { |
| // Verify LWG 3523 changes. |
| auto v1 = std::views::iota(0, 5); |
| auto w1 = decltype(v1)(v1.begin(), v1.end()); |
| VERIFY( std::ranges::equal(v1, w1) ); |
| |
| auto v2 = std::views::iota(0); |
| auto w2 = decltype(v2)(v2.begin(), v2.end()); |
| static_assert(std::same_as<decltype(w2.end()), std::unreachable_sentinel_t>); |
| VERIFY( *w2.begin() == 0 ); |
| |
| auto v3 = std::views::iota(0, 5l); |
| auto w3 = decltype(v3)(v3.begin(), v3.end()); |
| static_assert(!std::ranges::common_range<decltype(w3)>); |
| VERIFY( std::ranges::equal(v3, w3) ); |
| } |
| |
| template<auto iota = std::views::iota> |
| void |
| test07() |
| { |
| // Verify SFINAE behavior. |
| static_assert(!requires { iota(nullptr); }); |
| static_assert(!requires { iota(nullptr, nullptr); }); |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| test03(); |
| test04(); |
| test05(); |
| test06(); |
| test07(); |
| } |