| // Copyright (C) 2020-2021 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::ssize)); |
| |
| using std::ptrdiff_t; |
| |
| void |
| test01() |
| { |
| constexpr int a[10] = { }; |
| static_assert( std::same_as<decltype(std::ranges::ssize(a)), ptrdiff_t> ); |
| static_assert( std::ranges::ssize(a) == 10 ); |
| static_assert( noexcept(std::ranges::ssize(a)) ); |
| |
| int a2[2]; |
| static_assert( std::same_as<decltype(std::ranges::ssize(a2)), ptrdiff_t> ); |
| VERIFY( std::ranges::ssize(a2) == 2); |
| static_assert( noexcept(std::ranges::ssize(a2)) ); |
| } |
| |
| void |
| test02() |
| { |
| int a[3] = { }; |
| __gnu_test::test_sized_range<int, __gnu_test::input_iterator_wrapper> ri(a); |
| VERIFY( std::ranges::ssize(ri) == 3 ); |
| static_assert( noexcept(std::ranges::ssize(ri)) ); |
| } |
| |
| void |
| test04() |
| { |
| int a[] = { 0, 1 }; |
| __gnu_test::test_range<int, __gnu_test::random_access_iterator_wrapper> r(a); |
| VERIFY( std::ranges::ssize(r) == 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::ssize(r) == 1 ); |
| } |
| |
| void |
| test06() |
| { |
| auto i = std::views::iota(1ull, 5u); |
| auto s = std::ranges::size(i); |
| auto ss = std::ranges::ssize(i); |
| // std::ranges::range_difference_t<decltype(i)> is larger than long long, |
| // but LWG 3403 says ranges::ssize(i) returns the signed version of the |
| // type that ranges::size(i) returns, not the range's difference_type. |
| static_assert( std::same_as<decltype(ss), std::make_signed_t<decltype(s)>> ); |
| VERIFY( s == 4 ); |
| } |
| |
| void |
| test07() |
| { |
| #ifdef __SIZEOF_INT128__ |
| struct R |
| { |
| unsigned __int128 size() const { return 4; } |
| }; |
| R r; |
| static_assert( std::same_as<decltype(std::ranges::ssize(r)), __int128> ); |
| VERIFY( std::ranges::ssize(r) == 4 ); |
| #endif |
| } |
| |
| int |
| main() |
| { |
| test01(); |
| test02(); |
| test04(); |
| test05(); |
| test06(); |
| test07(); |
| } |