| // -*- C++ -*- |
| //===-- remove_copy.pass.cpp ----------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14 |
| |
| #include "support/pstl_test_config.h" |
| |
| #include <execution> |
| #include <algorithm> |
| |
| #include "support/utils.h" |
| |
| using namespace TestUtils; |
| |
| struct run_remove_copy |
| { |
| template <typename Policy, typename InputIterator, typename OutputIterator, typename OutputIterator2, typename Size, |
| typename T> |
| void |
| operator()(Policy&& exec, InputIterator first, InputIterator last, OutputIterator out_first, |
| OutputIterator out_last, OutputIterator2 expected_first, OutputIterator2, Size n, const T& value, |
| T trash) |
| { |
| // Cleaning |
| std::fill_n(expected_first, n, trash); |
| std::fill_n(out_first, n, trash); |
| |
| // Run copy_if |
| auto i = std::remove_copy(first, last, expected_first, value); |
| (void)i; |
| auto k = std::remove_copy(exec, first, last, out_first, value); |
| EXPECT_EQ_N(expected_first, out_first, n, "wrong remove_copy effect"); |
| for (size_t j = 0; j < GuardSize; ++j) |
| { |
| ++k; |
| } |
| EXPECT_TRUE(out_last == k, "wrong return value from remove_copy"); |
| } |
| }; |
| |
| template <typename T, typename Convert> |
| void |
| test(T trash, const T& value, Convert convert, bool check_weakness = true) |
| { |
| // Try sequences of various lengths. |
| for (size_t n = 0; n <= 100000; n = n <= 16 ? n + 1 : size_t(3.1415 * n)) |
| { |
| // count is number of output elements, plus a handful |
| // more for sake of detecting buffer overruns. |
| size_t count = GuardSize; |
| Sequence<T> in(n, [&](size_t k) -> T { |
| T x = convert(n ^ k); |
| count += !(x == value) ? 1 : 0; |
| return x; |
| }); |
| using namespace std; |
| |
| Sequence<T> out(count, [=](size_t) { return trash; }); |
| Sequence<T> expected(count, [=](size_t) { return trash; }); |
| if (check_weakness) |
| { |
| auto expected_result = remove_copy(in.cfbegin(), in.cfend(), expected.begin(), value); |
| size_t m = expected_result - expected.begin(); |
| EXPECT_TRUE(n / 4 <= m && m <= 3 * (n + 1) / 4, "weak test for remove_copy"); |
| } |
| invoke_on_all_policies(run_remove_copy(), in.begin(), in.end(), out.begin(), out.end(), expected.begin(), |
| expected.end(), count, value, trash); |
| invoke_on_all_policies(run_remove_copy(), in.cbegin(), in.cend(), out.begin(), out.end(), expected.begin(), |
| expected.end(), count, value, trash); |
| } |
| } |
| |
| int |
| main() |
| { |
| |
| test<float64_t>(-666.0, 8.5, [](size_t j) { return ((j + 1) % 7 & 2) != 0 ? 8.5 : float64_t(j % 32 + j); }); |
| |
| test<int32_t>(-666, 42, [](size_t j) { return ((j + 1) % 5 & 2) != 0 ? 42 : -1 - int32_t(j); }); |
| |
| test<Number>(Number(42, OddTag()), Number(2001, OddTag()), |
| [](int32_t j) { return ((j + 1) % 3 & 2) != 0 ? Number(2001, OddTag()) : Number(j, OddTag()); }); |
| std::cout << done() << std::endl; |
| return 0; |
| } |