143 lines
4.7 KiB
C++
143 lines
4.7 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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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// template<class T, output_iterator<const T&> O, sentinel_for<O> S>
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// constexpr O ranges::fill(O first, S last, const T& value);
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// template<class T, output_range<const T&> R>
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// constexpr borrowed_iterator_t<R> ranges::fill(R&& r, const T& value);
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#include <algorithm>
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#include <array>
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#include <cassert>
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#include <ranges>
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#include <string>
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#include "almost_satisfies_types.h"
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#include "test_iterators.h"
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template <class Iter, class Sent = sentinel_wrapper<Iter>>
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concept HasFillIt = requires(Iter iter, Sent sent) { std::ranges::fill(iter, sent, int{}); };
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static_assert(HasFillIt<int*>);
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static_assert(!HasFillIt<OutputIteratorNotIndirectlyWritable>);
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static_assert(!HasFillIt<OutputIteratorNotInputOrOutputIterator>);
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static_assert(!HasFillIt<int*, SentinelForNotSemiregular>);
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static_assert(!HasFillIt<int*, SentinelForNotWeaklyEqualityComparableWith>);
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template <class Range>
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concept HasFillR = requires(Range range) { std::ranges::fill(range, int{}); };
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static_assert(HasFillR<UncheckedRange<int*>>);
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static_assert(!HasFillR<OutputRangeNotIndirectlyWritable>);
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static_assert(!HasFillR<OutputRangeNotInputOrOutputIterator>);
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static_assert(!HasFillR<OutputRangeNotSentinelSemiregular>);
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static_assert(!HasFillR<OutputRangeNotSentinelEqualityComparableWith>);
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template <class It, class Sent = It>
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constexpr void test_iterators() {
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{ // simple test
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{
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int a[3];
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std::same_as<It> auto ret = std::ranges::fill(It(a), Sent(It(a + 3)), 1);
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assert(std::all_of(a, a + 3, [](int i) { return i == 1; }));
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assert(base(ret) == a + 3);
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}
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{
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int a[3];
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auto range = std::ranges::subrange(It(a), Sent(It(a + 3)));
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std::same_as<It> auto ret = std::ranges::fill(range, 1);
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assert(std::all_of(a, a + 3, [](int i) { return i == 1; }));
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assert(base(ret) == a + 3);
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}
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}
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{ // check that an empty range works
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{
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std::array<int, 0> a;
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auto ret = std::ranges::fill(It(a.data()), Sent(It(a.data())), 1);
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assert(base(ret) == a.data());
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}
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{
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std::array<int, 0> a;
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auto range = std::ranges::subrange(It(a.data()), Sent(It(a.data())));
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auto ret = std::ranges::fill(range, 1);
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assert(base(ret) == a.data());
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}
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}
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}
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constexpr bool test() {
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test_iterators<cpp17_output_iterator<int*>, sentinel_wrapper<cpp17_output_iterator<int*>>>();
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test_iterators<cpp20_output_iterator<int*>, sentinel_wrapper<cpp20_output_iterator<int*>>>();
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test_iterators<forward_iterator<int*>>();
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test_iterators<bidirectional_iterator<int*>>();
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test_iterators<random_access_iterator<int*>>();
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test_iterators<contiguous_iterator<int*>>();
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test_iterators<int*>();
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{ // check that every element is copied once
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struct S {
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bool copied = false;
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constexpr S& operator=(const S&) {
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copied = true;
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return *this;
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}
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};
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{
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S a[5];
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std::ranges::fill(a, a + 5, S {true});
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assert(std::all_of(a, a + 5, [](S& s) { return s.copied; }));
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}
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{
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S a[5];
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std::ranges::fill(a, S {true});
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assert(std::all_of(a, a + 5, [](S& s) { return s.copied; }));
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}
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}
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{ // check that std::ranges::dangling is returned
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[[maybe_unused]] std::same_as<std::ranges::dangling> decltype(auto) ret =
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std::ranges::fill(std::array<int, 10> {}, 1);
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}
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{ // check that std::ranges::dangling isn't returned with a borrowing range
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std::array<int, 10> a{};
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[[maybe_unused]] std::same_as<std::array<int, 10>::iterator> decltype(auto) ret =
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std::ranges::fill(std::views::all(a), 1);
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assert(std::all_of(a.begin(), a.end(), [](int i) { return i == 1; }));
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}
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{ // check that non-trivially copyable items are copied properly
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{
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std::array<std::string, 10> a;
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auto ret = std::ranges::fill(a.begin(), a.end(), "long long string so no SSO");
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assert(ret == a.data() + a.size());
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assert(std::all_of(a.begin(), a.end(), [](auto& s) { return s == "long long string so no SSO"; }));
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}
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{
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std::array<std::string, 10> a;
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auto ret = std::ranges::fill(a, "long long string so no SSO");
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assert(ret == a.data() + a.size());
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assert(std::all_of(a.begin(), a.end(), [](auto& s) { return s == "long long string so no SSO"; }));
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}
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}
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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