Mercurial > hg > CbC > CbC_gcc
view libstdc++-v3/testsuite/std/ranges/access/rend.cc @ 152:2b5abeee2509
update gcc11
author | anatofuz |
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date | Mon, 25 May 2020 07:50:57 +0900 |
parents | 1830386684a0 |
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// Copyright (C) 2019-2020 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> struct R1 { int i = 0; int j = 0; constexpr const int* rbegin() const { return &i; } constexpr const int* rend() const { return &i + 1; } friend constexpr const int* rbegin(const R1&&); // not defined friend constexpr const int* rend(const R1&&); // not defined }; // N.B. this is a lie, rend on an R1 rvalue will return a dangling pointer. template<> constexpr bool std::ranges::enable_safe_range<R1> = true; void test01() { constexpr R1 r; // decay-copy(t.rend()) if it is a valid expression // and its type S models sentinel_for<decltype(ranges::rbegin(E))> static_assert( std::ranges::rend(r) == &r.i + 1 ); static_assert( std::ranges::rend(std::move(r)) == &r.i + 1 ); } struct R2 { int i = 0; int* rbegin() noexcept { return &i + 1; } long* rend() noexcept { return nullptr; } // not a sentinel for rbegin() friend long* rbegin(R2&) noexcept { return nullptr; } friend int* rend(R2& r) { return &r.i; } }; void test02() { R2 r; // Otherwise, decay-copy(rend(t)) if it is a valid expression // and its type S models sentinel_for<decltype(ranges::rbegin(E))> auto i1 = std::ranges::rbegin(r); auto i2 = rend(r); static_assert( std::sentinel_for<decltype(i2), decltype(i1)> ); VERIFY( std::ranges::rend(r) == &r.i ); static_assert( !noexcept(std::ranges::rend(r)) ); } struct R3 { int a[2] = { }; long l[2] = { }; constexpr const int* begin() const { return a; } constexpr const int* end() const { return a + 2; } friend constexpr const long* begin(const R3&& r) { return r.l; } friend constexpr const long* end(const R3&& r) { return r.l + 2; } }; // N.B. this is a lie, begin/end on an R3 rvalue will return a dangling pointer. template<> constexpr bool std::ranges::enable_safe_range<R3> = true; void test03() { constexpr R3 r; // Otherwise, make_reverse_iterator(ranges::begin(t)) if both // ranges::begin(t) and ranges::end(t) are valid expressions // of the same type I which models bidirectional_iterator. static_assert( std::ranges::rend(r) == std::make_reverse_iterator(std::ranges::begin(r)) ); static_assert( std::ranges::rend(std::move(r)) == std::make_reverse_iterator(std::ranges::begin(std::move(r))) ); } void test04() { struct R4 : __gnu_test::test_range<int, __gnu_test::bidirectional_iterator_wrapper> { R4(int (&a)[2]) : test_range(a) { } using test_range::begin; // Replace test_range::end() to return same type as begin() // so ranges::rend will wrap it in a reverse_iterator. auto end() & { using __gnu_test::bidirectional_iterator_wrapper; return bidirectional_iterator_wrapper<int>(bounds.last, &bounds); } }; int a[2] = { }; R4 r(a); VERIFY( std::ranges::rend(r) == std::make_reverse_iterator(std::ranges::begin(r)) ); } int main() { test01(); test02(); test03(); test04(); }