c4e98722ca
This fixes thr bug reported in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108846. Reviewed By: ldionne, #libc Spies: mstorsjo, libcxx-commits Differential Revision: https://reviews.llvm.org/D151953
124 lines
4.2 KiB
C++
124 lines
4.2 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<InputIterator InIter, OutputIterator<auto, InIter::reference> OutIter>
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// constexpr OutIter // constexpr after C++17
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// copy_n(InIter first, InIter::difference_type n, OutIter result);
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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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#include "user_defined_integral.h"
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typedef UserDefinedIntegral<unsigned> UDI;
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class PaddedBase {
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public:
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TEST_CONSTEXPR PaddedBase(std::int16_t a, std::int8_t b) : a_(a), b_(b) {}
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std::int16_t a_;
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std::int8_t b_;
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};
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class Derived : public PaddedBase {
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public:
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TEST_CONSTEXPR Derived(std::int16_t a, std::int8_t b, std::int8_t c) : PaddedBase(a, b), c_(c) {}
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std::int8_t c_;
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};
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template <class InIter, class OutIter>
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TEST_CONSTEXPR_CXX20 void
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test_copy_n()
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{
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{
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const unsigned N = 1000;
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int ia[N] = {};
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for (unsigned i = 0; i < N; ++i)
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ia[i] = i;
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int ib[N] = {0};
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OutIter r = std::copy_n(InIter(ia), UDI(N/2), OutIter(ib));
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assert(base(r) == ib+N/2);
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for (unsigned i = 0; i < N/2; ++i)
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assert(ia[i] == ib[i]);
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}
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{ // Make sure that padding bits aren't copied
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Derived src(1, 2, 3);
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Derived dst(4, 5, 6);
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std::copy_n(static_cast<PaddedBase*>(&src), 1, static_cast<PaddedBase*>(&dst));
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assert(dst.a_ == 1);
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assert(dst.b_ == 2);
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assert(dst.c_ == 6);
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}
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{ // Make sure that overlapping ranges can be copied
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int a[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
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std::copy_n(a + 3, 7, a);
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int expected[] = {4, 5, 6, 7, 8, 9, 10, 8, 9, 10};
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assert(std::equal(a, a + 10, expected));
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}
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}
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TEST_CONSTEXPR_CXX20 bool
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test()
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{
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test_copy_n<cpp17_input_iterator<const int*>, cpp17_output_iterator<int*> >();
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test_copy_n<cpp17_input_iterator<const int*>, cpp17_input_iterator<int*> >();
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test_copy_n<cpp17_input_iterator<const int*>, forward_iterator<int*> >();
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test_copy_n<cpp17_input_iterator<const int*>, bidirectional_iterator<int*> >();
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test_copy_n<cpp17_input_iterator<const int*>, random_access_iterator<int*> >();
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test_copy_n<cpp17_input_iterator<const int*>, int*>();
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test_copy_n<forward_iterator<const int*>, cpp17_output_iterator<int*> >();
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test_copy_n<forward_iterator<const int*>, cpp17_input_iterator<int*> >();
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test_copy_n<forward_iterator<const int*>, forward_iterator<int*> >();
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test_copy_n<forward_iterator<const int*>, bidirectional_iterator<int*> >();
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test_copy_n<forward_iterator<const int*>, random_access_iterator<int*> >();
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test_copy_n<forward_iterator<const int*>, int*>();
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test_copy_n<bidirectional_iterator<const int*>, cpp17_output_iterator<int*> >();
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test_copy_n<bidirectional_iterator<const int*>, cpp17_input_iterator<int*> >();
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test_copy_n<bidirectional_iterator<const int*>, forward_iterator<int*> >();
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test_copy_n<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
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test_copy_n<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
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test_copy_n<bidirectional_iterator<const int*>, int*>();
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test_copy_n<random_access_iterator<const int*>, cpp17_output_iterator<int*> >();
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test_copy_n<random_access_iterator<const int*>, cpp17_input_iterator<int*> >();
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test_copy_n<random_access_iterator<const int*>, forward_iterator<int*> >();
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test_copy_n<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
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test_copy_n<random_access_iterator<const int*>, random_access_iterator<int*> >();
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test_copy_n<random_access_iterator<const int*>, int*>();
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test_copy_n<const int*, cpp17_output_iterator<int*> >();
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test_copy_n<const int*, cpp17_input_iterator<int*> >();
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test_copy_n<const int*, forward_iterator<int*> >();
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test_copy_n<const int*, bidirectional_iterator<int*> >();
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test_copy_n<const int*, random_access_iterator<int*> >();
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test_copy_n<const int*, int*>();
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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();
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#if TEST_STD_VER > 17
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static_assert(test());
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#endif
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return 0;
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}
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