211 lines
7.6 KiB
C++
211 lines
7.6 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<input_iterator I, sentinel_for<I> S, weakly_incrementable O>
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// requires indirectly_copyable<I, O>
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// constexpr ranges::copy_result<I, O> ranges::copy(I first, S last, O result);
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// template<input_range R, weakly_incrementable O>
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// requires indirectly_copyable<iterator_t<R>, O>
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// constexpr ranges::copy_result<borrowed_iterator_t<R>, O> ranges::copy(R&& r, O result);
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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 "almost_satisfies_types.h"
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#include "test_iterators.h"
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#include "type_algorithms.h"
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template <class In, class Out = In, class Sent = sentinel_wrapper<In>>
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concept HasCopyIt = requires(In in, Sent sent, Out out) { std::ranges::copy(in, sent, out); };
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static_assert(HasCopyIt<int*>);
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static_assert(!HasCopyIt<InputIteratorNotDerivedFrom>);
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static_assert(!HasCopyIt<InputIteratorNotIndirectlyReadable>);
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static_assert(!HasCopyIt<InputIteratorNotInputOrOutputIterator>);
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static_assert(!HasCopyIt<int*, WeaklyIncrementableNotMovable>);
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struct NotIndirectlyCopyable {};
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static_assert(!HasCopyIt<int*, NotIndirectlyCopyable*>);
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static_assert(!HasCopyIt<int*, int*, SentinelForNotSemiregular>);
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static_assert(!HasCopyIt<int*, int*, SentinelForNotWeaklyEqualityComparableWith>);
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template <class Range, class Out>
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concept HasCopyR = requires(Range range, Out out) { std::ranges::copy(range, out); };
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static_assert(HasCopyR<std::array<int, 10>, int*>);
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static_assert(!HasCopyR<InputRangeNotDerivedFrom, int*>);
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static_assert(!HasCopyR<InputRangeNotIndirectlyReadable, int*>);
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static_assert(!HasCopyR<InputRangeNotInputOrOutputIterator, int*>);
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static_assert(!HasCopyR<WeaklyIncrementableNotMovable, int*>);
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static_assert(!HasCopyR<UncheckedRange<NotIndirectlyCopyable*>, int*>);
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static_assert(!HasCopyR<InputRangeNotSentinelSemiregular, int*>);
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static_assert(!HasCopyR<InputRangeNotSentinelEqualityComparableWith, int*>);
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static_assert(std::is_same_v<std::ranges::copy_result<int, long>, std::ranges::in_out_result<int, long>>);
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template <class In, class Out, class Sent = In>
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constexpr void test_iterators() {
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{ // simple test
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{
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std::array in {1, 2, 3, 4};
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std::array<int, 4> out;
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std::same_as<std::ranges::in_out_result<In, Out>> auto ret =
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std::ranges::copy(In(in.data()), Sent(In(in.data() + in.size())), Out(out.data()));
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assert(in == out);
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assert(base(ret.in) == in.data() + in.size());
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assert(base(ret.out) == out.data() + out.size());
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}
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{
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std::array in {1, 2, 3, 4};
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std::array<int, 4> out;
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auto range = std::ranges::subrange(In(in.data()), Sent(In(in.data() + in.size())));
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std::same_as<std::ranges::in_out_result<In, Out>> auto ret = std::ranges::copy(range, Out(out.data()));
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assert(in == out);
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assert(base(ret.in) == in.data() + in.size());
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assert(base(ret.out) == out.data() + out.size());
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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> in;
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std::array<int, 0> out;
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auto ret = std::ranges::copy(In(in.data()), Sent(In(in.data() + in.size())), Out(out.data()));
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assert(base(ret.in) == in.data());
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assert(base(ret.out) == out.data());
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}
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{
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std::array<int, 0> in;
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std::array<int, 0> out;
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auto range = std::ranges::subrange(In(in.data()), Sent(In(in.data() + in.size())));
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auto ret = std::ranges::copy(range, Out(out.data()));
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assert(base(ret.in) == in.data());
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assert(base(ret.out) == out.data());
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}
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}
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}
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constexpr bool test() {
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meta::for_each(meta::forward_iterator_list<int*>{}, []<class Out>() {
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test_iterators<cpp20_input_iterator<int*>, Out, sentinel_wrapper<cpp20_input_iterator<int*>>>();
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test_iterators<ProxyIterator<cpp20_input_iterator<int*>>,
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ProxyIterator<Out>,
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sentinel_wrapper<ProxyIterator<cpp20_input_iterator<int*>>>>();
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meta::for_each(meta::forward_iterator_list<int*>{}, []<class In>() {
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test_iterators<In, Out>();
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test_iterators<In, Out, sized_sentinel<In>>();
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test_iterators<In, Out, sentinel_wrapper<In>>();
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test_iterators<ProxyIterator<In>, ProxyIterator<Out>>();
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test_iterators<ProxyIterator<In>, ProxyIterator<Out>, sized_sentinel<ProxyIterator<In>>>();
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test_iterators<ProxyIterator<In>, ProxyIterator<Out>, sentinel_wrapper<ProxyIterator<In>>>();
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});
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});
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{ // check that ranges::dangling is returned
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std::array<int, 4> out;
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std::same_as<std::ranges::in_out_result<std::ranges::dangling, int*>> auto ret =
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std::ranges::copy(std::array{1, 2, 3, 4}, out.data());
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assert(ret.out == out.data() + 4);
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assert((out == std::array{1, 2, 3, 4}));
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}
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{ // check that an iterator is returned with a borrowing range
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std::array in {1, 2, 3, 4};
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std::array<int, 4> out;
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std::same_as<std::ranges::in_out_result<int*, int*>> auto ret = std::ranges::copy(std::views::all(in), out.data());
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assert(ret.in == in.data() + 4);
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assert(ret.out == out.data() + 4);
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assert(in == out);
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}
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{ // check that every element is copied exactly once
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struct CopyOnce {
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bool copied = false;
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constexpr CopyOnce() = default;
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constexpr CopyOnce(const CopyOnce& other) = delete;
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constexpr CopyOnce& operator=(const CopyOnce& other) {
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assert(!other.copied);
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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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std::array<CopyOnce, 4> in {};
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std::array<CopyOnce, 4> out {};
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auto ret = std::ranges::copy(in.begin(), in.end(), out.begin());
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assert(ret.in == in.end());
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assert(ret.out == out.end());
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assert(std::all_of(out.begin(), out.end(), [](const auto& e) { return e.copied; }));
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}
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{
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std::array<CopyOnce, 4> in {};
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std::array<CopyOnce, 4> out {};
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auto ret = std::ranges::copy(in, out.begin());
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assert(ret.in == in.end());
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assert(ret.out == out.end());
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assert(std::all_of(out.begin(), out.end(), [](const auto& e) { return e.copied; }));
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}
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}
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{ // check that the range is copied forwards
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struct OnlyForwardsCopyable {
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OnlyForwardsCopyable* next = nullptr;
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bool canCopy = false;
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OnlyForwardsCopyable() = default;
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constexpr OnlyForwardsCopyable& operator=(const OnlyForwardsCopyable&) {
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assert(canCopy);
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if (next != nullptr)
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next->canCopy = true;
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return *this;
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}
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};
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{
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std::array<OnlyForwardsCopyable, 3> in {};
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std::array<OnlyForwardsCopyable, 3> out {};
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out[0].next = &out[1];
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out[1].next = &out[2];
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out[0].canCopy = true;
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auto ret = std::ranges::copy(in.begin(), in.end(), out.begin());
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assert(ret.in == in.end());
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assert(ret.out == out.end());
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assert(out[0].canCopy);
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assert(out[1].canCopy);
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assert(out[2].canCopy);
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}
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{
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std::array<OnlyForwardsCopyable, 3> in {};
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std::array<OnlyForwardsCopyable, 3> out {};
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out[0].next = &out[1];
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out[1].next = &out[2];
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out[0].canCopy = true;
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auto ret = std::ranges::copy(in, out.begin());
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assert(ret.in == in.end());
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assert(ret.out == out.end());
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assert(out[0].canCopy);
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assert(out[1].canCopy);
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assert(out[2].canCopy);
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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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