//===----------------------------------------------------------------------===//
//
// 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, c++17
// std::views::counted;
#include <ranges>
#include <cassert>
#include <concepts>
#include <cstddef>
#include <memory>
#include <span>
#include <utility>
#include "test_macros.h"
#include "test_iterators.h"
struct RvalueConvertible {
RvalueConvertible(const RvalueConvertible&) = delete;
operator int() &&;
};
struct LvalueConvertible {
LvalueConvertible(const LvalueConvertible&) = delete;
operator int() &;
};
struct OnlyExplicitlyConvertible {
explicit operator int() const;
};
template<class... Ts>
concept CountedInvocable = requires (Ts&&... ts) {
std::views::counted(std::forward<Ts>(ts)...);
};
constexpr bool test() {
int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
{
static_assert(std::addressof(std::views::counted) == std::addressof(std::ranges::views::counted));
static_assert( CountedInvocable<int*, std::size_t>);
static_assert(!CountedInvocable<int*, LvalueConvertible>);
static_assert( CountedInvocable<int*, LvalueConvertible&>);
static_assert( CountedInvocable<int*, RvalueConvertible>);
static_assert(!CountedInvocable<int*, RvalueConvertible&>);
static_assert(!CountedInvocable<int*, OnlyExplicitlyConvertible>);
static_assert(!CountedInvocable<int*, int*>);
static_assert(!CountedInvocable<int*>);
static_assert(!CountedInvocable<std::size_t>);
static_assert(!CountedInvocable<>);
}
{
auto c1 = std::views::counted(buffer, 3);
auto c2 = std::views::counted(std::as_const(buffer), 3);
ASSERT_SAME_TYPE(decltype(c1), std::span<int>);
ASSERT_SAME_TYPE(decltype(c2), std::span<const int>);
assert(c1.data() == buffer && c1.size() == 3);
assert(c2.data() == buffer && c2.size() == 3);
}
{
auto it = contiguous_iterator<int*>(buffer);
auto cit = contiguous_iterator<const int*>(buffer);
auto c1 = std::views::counted(it, 3);
auto c2 = std::views::counted(std::as_const(it), 3);
auto c3 = std::views::counted(std::move(it), 3);
auto c4 = std::views::counted(contiguous_iterator<int*>(buffer), 3);
auto c5 = std::views::counted(cit, 3);
auto c6 = std::views::counted(std::as_const(cit), 3);
auto c7 = std::views::counted(std::move(cit), 3);
auto c8 = std::views::counted(contiguous_iterator<const int*>(buffer), 3);
ASSERT_SAME_TYPE(decltype(c1), std::span<int>);
ASSERT_SAME_TYPE(decltype(c2), std::span<int>);
ASSERT_SAME_TYPE(decltype(c3), std::span<int>);
ASSERT_SAME_TYPE(decltype(c4), std::span<int>);
ASSERT_SAME_TYPE(decltype(c5), std::span<const int>);
ASSERT_SAME_TYPE(decltype(c6), std::span<const int>);
ASSERT_SAME_TYPE(decltype(c7), std::span<const int>);
ASSERT_SAME_TYPE(decltype(c8), std::span<const int>);
assert(c1.data() == buffer && c1.size() == 3);
assert(c2.data() == buffer && c2.size() == 3);
assert(c3.data() == buffer && c3.size() == 3);
assert(c4.data() == buffer && c4.size() == 3);
assert(c5.data() == buffer && c5.size() == 3);
assert(c6.data() == buffer && c6.size() == 3);
assert(c7.data() == buffer && c7.size() == 3);
assert(c8.data() == buffer && c8.size() == 3);
}
{
auto it = random_access_iterator<int*>(buffer);
auto cit = random_access_iterator<const int*>(buffer);
auto it_copy = it;
auto cit_copy = cit;
auto c1 = std::views::counted(it, 3);
auto c2 = std::views::counted(std::as_const(it), 3);
auto c3 = std::views::counted(std::move(it_copy), 3);
auto c4 = std::views::counted(random_access_iterator<int*>(buffer), 3);
auto c5 = std::views::counted(cit, 3);
auto c6 = std::views::counted(std::as_const(cit), 3);
auto c7 = std::views::counted(std::move(cit_copy), 3);
auto c8 = std::views::counted(random_access_iterator<const int*>(buffer), 3);
ASSERT_SAME_TYPE(decltype(c1), std::ranges::subrange<random_access_iterator<int*>>);
ASSERT_SAME_TYPE(decltype(c2), std::ranges::subrange<random_access_iterator<int*>>);
ASSERT_SAME_TYPE(decltype(c3), std::ranges::subrange<random_access_iterator<int*>>);
ASSERT_SAME_TYPE(decltype(c4), std::ranges::subrange<random_access_iterator<int*>>);
ASSERT_SAME_TYPE(decltype(c5), std::ranges::subrange<random_access_iterator<const int*>>);
ASSERT_SAME_TYPE(decltype(c6), std::ranges::subrange<random_access_iterator<const int*>>);
ASSERT_SAME_TYPE(decltype(c7), std::ranges::subrange<random_access_iterator<const int*>>);
ASSERT_SAME_TYPE(decltype(c8), std::ranges::subrange<random_access_iterator<const int*>>);
assert(c1.begin() == it && c1.end() == it + 3);
assert(c2.begin() == it && c2.end() == it + 3);
assert(c3.begin() == it && c3.end() == it + 3);
assert(c4.begin() == it && c4.end() == it + 3);
assert(c5.begin() == cit && c5.end() == cit + 3);
assert(c6.begin() == cit && c6.end() == cit + 3);
assert(c7.begin() == cit && c7.end() == cit + 3);
assert(c8.begin() == cit && c8.end() == cit + 3);
}
{
auto it = bidirectional_iterator<int*>(buffer);
auto cit = bidirectional_iterator<const int*>(buffer);
auto it_copy = it;
auto cit_copy = cit;
auto c1 = std::views::counted(it, 3);
auto c2 = std::views::counted(std::as_const(it), 3);
auto c3 = std::views::counted(std::move(it_copy), 3);
auto c4 = std::views::counted(bidirectional_iterator<int*>(buffer), 3);
auto c5 = std::views::counted(cit, 3);
auto c6 = std::views::counted(std::as_const(cit), 3);
auto c7 = std::views::counted(std::move(cit_copy), 3);
auto c8 = std::views::counted(bidirectional_iterator<const int*>(buffer), 3);
using Expected = std::ranges::subrange<std::counted_iterator<decltype(it)>, std::default_sentinel_t>;
using ConstExpected = std::ranges::subrange<std::counted_iterator<decltype(cit)>, std::default_sentinel_t>;
ASSERT_SAME_TYPE(decltype(c1), Expected);
ASSERT_SAME_TYPE(decltype(c2), Expected);
ASSERT_SAME_TYPE(decltype(c3), Expected);
ASSERT_SAME_TYPE(decltype(c4), Expected);
ASSERT_SAME_TYPE(decltype(c5), ConstExpected);
ASSERT_SAME_TYPE(decltype(c6), ConstExpected);
ASSERT_SAME_TYPE(decltype(c7), ConstExpected);
ASSERT_SAME_TYPE(decltype(c8), ConstExpected);
assert(c1.begin().base() == it && c1.size() == 3);
assert(c2.begin().base() == it && c2.size() == 3);
assert(c3.begin().base() == it && c3.size() == 3);
assert(c4.begin().base() == it && c4.size() == 3);
assert(c5.begin().base() == cit && c5.size() == 3);
assert(c6.begin().base() == cit && c6.size() == 3);
assert(c7.begin().base() == cit && c7.size() == 3);
assert(c8.begin().base() == cit && c8.size() == 3);
}
{
auto it = cpp17_output_iterator<int*>(buffer);
auto it_copy = it;
auto c1 = std::views::counted(it, 3);
auto c2 = std::views::counted(std::as_const(it), 3);
auto c3 = std::views::counted(std::move(it_copy), 3);
auto c4 = std::views::counted(cpp17_output_iterator<int*>(buffer), 3);
using Expected = std::ranges::subrange<std::counted_iterator<decltype(it)>, std::default_sentinel_t>;
ASSERT_SAME_TYPE(decltype(c1), Expected);
ASSERT_SAME_TYPE(decltype(c2), Expected);
ASSERT_SAME_TYPE(decltype(c3), Expected);
ASSERT_SAME_TYPE(decltype(c4), Expected);
assert(base(c1.begin().base()) == buffer && c1.size() == 3);
assert(base(c2.begin().base()) == buffer && c2.size() == 3);
assert(base(c3.begin().base()) == buffer && c3.size() == 3);
assert(base(c4.begin().base()) == buffer && c4.size() == 3);
}
{
auto it = cpp17_input_iterator<int*>(buffer);
auto it_copy = it;
auto c1 = std::views::counted(it, 3);
auto c2 = std::views::counted(std::as_const(it), 3);
auto c3 = std::views::counted(std::move(it_copy), 3);
auto c4 = std::views::counted(cpp17_input_iterator<int*>(buffer), 3);
using Expected = std::ranges::subrange<std::counted_iterator<decltype(it)>, std::default_sentinel_t>;
ASSERT_SAME_TYPE(decltype(c1), Expected);
ASSERT_SAME_TYPE(decltype(c2), Expected);
ASSERT_SAME_TYPE(decltype(c3), Expected);
ASSERT_SAME_TYPE(decltype(c4), Expected);
assert(base(c1.begin().base()) == buffer && c1.size() == 3);
assert(base(c2.begin().base()) == buffer && c2.size() == 3);
assert(base(c3.begin().base()) == buffer && c3.size() == 3);
assert(base(c4.begin().base()) == buffer && c4.size() == 3);
}
{
auto it = cpp20_input_iterator<int*>(buffer);
static_assert(!std::copyable<cpp20_input_iterator<int*>>);
static_assert(!CountedInvocable<cpp20_input_iterator<int*>&, int>);
static_assert(!CountedInvocable<const cpp20_input_iterator<int*>&, int>);
auto c3 = std::views::counted(std::move(it), 3);
auto c4 = std::views::counted(cpp20_input_iterator<int*>(buffer), 3);
using Expected = std::ranges::subrange<std::counted_iterator<decltype(it)>, std::default_sentinel_t>;
ASSERT_SAME_TYPE(decltype(c3), Expected);
ASSERT_SAME_TYPE(decltype(c4), Expected);
assert(base(c3.begin().base()) == buffer && c3.size() == 3);
assert(base(c4.begin().base()) == buffer && c4.size() == 3);
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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