f73050e722
This patch hardens the "test iterators" we use to test algorithms by ensuring that they don't get double-moved. As a result of this hardening, the tests started reporting multiple failures where we would double-move iterators, which are being fixed in this patch. In particular: - Fixed a double-move in pstl.partition - Add coverage for begin()/end() in subrange tests - Fix tests for ranges::ends_with and ranges::contains, which were incorrectly calling begin() twice on the same subrange containing non-copyable input iterators. Fixes #100709
115 lines
3.4 KiB
C++
115 lines
3.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <algorithm>
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// template<BidirectionalIterator Iter, Predicate<auto, Iter::value_type> Pred>
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// requires ShuffleIterator<Iter>
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// && CopyConstructible<Pred>
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// constexpr Iter // constexpr in C++20
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// partition(Iter first, Iter last, Pred pred);
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#include <algorithm>
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#include <cassert>
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#include "test_macros.h"
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#include "test_iterators.h"
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struct is_odd
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{
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TEST_CONSTEXPR bool operator()(const int& i) const {return i & 1;}
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};
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template <class Iter>
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TEST_CONSTEXPR_CXX20 bool
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test()
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{
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// check mixed
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int ia[] = {1, 2, 3, 4, 5, 6, 7, 8 ,9};
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const unsigned sa = sizeof(ia)/sizeof(ia[0]);
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Iter r = std::partition(Iter(ia), Iter(ia + sa), is_odd());
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assert(base(r) == ia + 5);
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for (int* i = ia; i < base(r); ++i)
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assert(is_odd()(*i));
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for (int* i = base(r); i < ia+sa; ++i)
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assert(!is_odd()(*i));
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// check empty
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r = std::partition(Iter(ia), Iter(ia), is_odd());
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assert(base(r) == ia);
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// check all false
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for (unsigned i = 0; i < sa; ++i)
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ia[i] = 2*i;
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r = std::partition(Iter(ia), Iter(ia+sa), is_odd());
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assert(base(r) == ia);
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// check all true
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for (unsigned i = 0; i < sa; ++i)
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ia[i] = 2*i+1;
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r = std::partition(Iter(ia), Iter(ia+sa), is_odd());
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assert(base(r) == ia+sa);
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// check all true but last
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for (unsigned i = 0; i < sa; ++i)
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ia[i] = 2*i+1;
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ia[sa-1] = 10;
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r = std::partition(Iter(ia), Iter(ia+sa), is_odd());
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assert(base(r) == ia+sa-1);
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for (int* i = ia; i < base(r); ++i)
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assert(is_odd()(*i));
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for (int* i = base(r); i < ia+sa; ++i)
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assert(!is_odd()(*i));
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// check all true but first
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for (unsigned i = 0; i < sa; ++i)
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ia[i] = 2*i+1;
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ia[0] = 10;
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r = std::partition(Iter(ia), Iter(ia+sa), is_odd());
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assert(base(r) == ia+sa-1);
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for (int* i = ia; i < base(r); ++i)
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assert(is_odd()(*i));
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for (int* i = base(r); i < ia+sa; ++i)
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assert(!is_odd()(*i));
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// check all false but last
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for (unsigned i = 0; i < sa; ++i)
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ia[i] = 2*i;
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ia[sa-1] = 11;
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r = std::partition(Iter(ia), Iter(ia+sa), is_odd());
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assert(base(r) == ia+1);
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for (int* i = ia; i < base(r); ++i)
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assert(is_odd()(*i));
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for (int* i = base(r); i < ia+sa; ++i)
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assert(!is_odd()(*i));
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// check all false but first
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for (unsigned i = 0; i < sa; ++i)
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ia[i] = 2*i;
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ia[0] = 11;
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r = std::partition(Iter(ia), Iter(ia+sa), is_odd());
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assert(base(r) == ia+1);
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for (int* i = ia; i < base(r); ++i)
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assert(is_odd()(*i));
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for (int* i = base(r); i < ia+sa; ++i)
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assert(!is_odd()(*i));
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return true;
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}
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int main(int, char**)
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{
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test<forward_iterator<int*> >();
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test<bidirectional_iterator<int*> >();
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test<random_access_iterator<int*> >();
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test<int*>();
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#if TEST_STD_VER >= 20
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static_assert(test<forward_iterator<int*>>());
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static_assert(test<bidirectional_iterator<int*>>());
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static_assert(test<random_access_iterator<int*>>());
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static_assert(test<int*>());
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#endif
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return 0;
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}
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