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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// REQUIRES: std-at-least-c++23
// <ranges>
// constexpr auto end();
// constexpr auto end() const
// requires forward_range<const V> && forward_range<const Pattern> &&
// is_reference_v<range_reference_t<const V>> &&
// input_range<range_reference_t<const V>>;
// ADDITIONAL_COMPILE_FLAGS(has-fconstexpr-steps): -fconstexpr-steps=10000000
#include <ranges>
#include <algorithm>
#include <string>
#include <vector>
#include "../types.h"
#include "test_iterators.h"
template <class V, class Pattern>
concept JoinWithViewHasConstEnd = requires(const std::ranges::join_with_view<V, Pattern> jwv) { jwv.end(); };
template <size_t Bits>
requires(Bits < (1 << 7))
constexpr void test_end() {
constexpr bool v_models_forward_range = static_cast<bool>(Bits & (1 << 0));
constexpr bool inner_range_is_reference = static_cast<bool>(Bits & (1 << 1));
constexpr bool inner_range_models_forward_range = static_cast<bool>(Bits & (1 << 2));
constexpr bool v_models_common_range = static_cast<bool>(Bits & (1 << 3));
constexpr bool inner_range_models_common_range = static_cast<bool>(Bits & (1 << 4));
constexpr bool v_models_simple_range = static_cast<bool>(Bits & (1 << 5));
constexpr bool pattern_models_simple_range = static_cast<bool>(Bits & (1 << 6));
constexpr ViewProperties inner_range_props{.common = inner_range_models_common_range};
using InnerRange =
std::conditional_t<inner_range_models_forward_range,
BasicView<std::vector<int>, inner_range_props, forward_iterator>,
BasicView<std::vector<int>, inner_range_props, DefaultCtorInputIter>>;
constexpr ViewProperties v_props{.simple = v_models_simple_range, .common = v_models_common_range};
using UnderlyingV = std::conditional_t<inner_range_is_reference, std::vector<InnerRange>, RvalueVector<InnerRange>>;
using V = std::conditional_t<v_models_forward_range,
BasicView<UnderlyingV, v_props, forward_iterator>,
BasicView<UnderlyingV, v_props, DefaultCtorInputIter>>;
using UnderlyingPattern = std::vector<int>;
using Pattern = BasicView<UnderlyingPattern, ViewProperties{.simple = pattern_models_simple_range}, forward_iterator>;
using JWV = std::ranges::join_with_view<V, Pattern>;
using Iter = std::ranges::iterator_t<JWV>;
// Test when `JWV` models common range
static_assert(std::same_as<Iter, std::ranges::sentinel_t<JWV>> ==
(v_models_forward_range && inner_range_is_reference && inner_range_models_forward_range &&
v_models_common_range && inner_range_models_common_range));
{ // `V` and `Pattern` are empty
V v{};
Pattern pattern{};
JWV jwv(std::move(v), std::move(pattern));
Iter it = jwv.begin();
std::sentinel_for<Iter> decltype(auto) se = jwv.end();
assert(it == se);
}
{ // `V` is empty, `Pattern` contains some elements
V v{};
Pattern pattern{std::vector<int>{0}};
JWV jwv(std::move(v), std::move(pattern));
Iter it = jwv.begin();
std::sentinel_for<Iter> decltype(auto) se = jwv.end();
assert(it == se);
}
{ // `V` is not empty, `Pattern is empty`
V v{UnderlyingV{
std::vector<InnerRange>{InnerRange(std::vector<int>{1, 2, 3}), InnerRange(std::vector<int>{4, 5, 6})}}};
Pattern pattern{};
JWV jwv(std::move(v), std::move(pattern));
Iter it = jwv.begin();
std::sentinel_for<Iter> decltype(auto) se = jwv.end();
assert(std::ranges::next(it, 6) == se);
}
{ // `V` and `Pattern` are not empty
V v{UnderlyingV{std::vector<InnerRange>{
InnerRange(std::vector<int>{6, 5}),
InnerRange(std::vector<int>{4, 3}),
InnerRange(std::vector<int>{2, 1, 0})}}};
Pattern pattern{std::vector<int>{-1, -1}};
JWV jwv(std::move(v), std::move(pattern));
Iter it = jwv.begin();
std::sentinel_for<Iter> decltype(auto) se = jwv.end();
assert(std::ranges::next(it, 11) == se);
}
}
template <std::size_t Bits>
requires(Bits < (1 << 7))
constexpr void test_const_end() {
constexpr bool const_v_models_forward_range = static_cast<bool>(Bits & (1 << 0));
constexpr bool const_pattern_models_forward_range = static_cast<bool>(Bits & (1 << 1));
constexpr bool inner_const_range_is_reference = static_cast<bool>(Bits & (1 << 2));
constexpr bool inner_const_range_models_input_range = static_cast<bool>(Bits & (1 << 3));
constexpr bool inner_const_range_models_forward_range = static_cast<bool>(Bits & (1 << 4));
constexpr bool const_v_models_common_range = static_cast<bool>(Bits & (1 << 5));
constexpr bool inner_const_range_models_common_range = static_cast<bool>(Bits & (1 << 6));
constexpr ViewProperties inner_range_props{.common = inner_const_range_models_common_range};
using InnerRange =
std::conditional_t<inner_const_range_models_forward_range,
BasicView<std::vector<int>, inner_range_props, forward_iterator>,
std::conditional_t<inner_const_range_models_input_range,
BasicView<std::vector<int>, inner_range_props, DefaultCtorInputIter>,
InputRangeButOutputWhenConst<int>>>;
constexpr ViewProperties v_props{.common = const_v_models_common_range};
using UnderlyingV =
std::conditional_t<inner_const_range_is_reference, std::vector<InnerRange>, RvalueVector<InnerRange>>;
using V = std::conditional_t<const_v_models_forward_range,
BasicView<UnderlyingV, v_props, forward_iterator>,
BasicView<UnderlyingV, v_props, DefaultCtorInputIter>>;
using Pattern =
std::conditional_t<const_pattern_models_forward_range,
BasicView<std::vector<int>, ViewProperties{}, forward_iterator>,
ForwardViewButInputWhenConst<int>>;
using JWV = std::ranges::join_with_view<V, Pattern>;
static_assert(JoinWithViewHasConstEnd<V, Pattern> ==
(const_v_models_forward_range && const_pattern_models_forward_range && inner_const_range_is_reference &&
(inner_const_range_models_input_range || inner_const_range_models_forward_range)));
static_assert(JoinWithViewHasConstEnd<V, Pattern> == std::ranges::range<const JWV>);
if constexpr (std::ranges::range<const JWV>) {
using ConstIter = std::ranges::iterator_t<const JWV>;
// Test when `const JWV` models common range
static_assert(std::same_as<ConstIter, std::ranges::sentinel_t<const JWV>> ==
(inner_const_range_models_forward_range && const_v_models_common_range &&
inner_const_range_models_common_range));
{ // `const V` and `const Pattern` are empty
V v{};
Pattern pattern{};
const JWV jwv(std::move(v), std::move(pattern));
ConstIter it = jwv.begin();
std::sentinel_for<ConstIter> decltype(auto) se = jwv.end();
assert(it == se);
}
{ // `const V` is empty, `const Pattern` contains some elements
V v{};
Pattern pattern{std::vector<int>{1}};
const JWV jwv(std::move(v), std::move(pattern));
ConstIter it = jwv.begin();
std::sentinel_for<ConstIter> decltype(auto) se = jwv.end();
assert(it == se);
}
{ // `const V` is not empty, `const Pattern is empty`
V v{UnderlyingV{
std::vector<InnerRange>{InnerRange(std::vector<int>{1, 2, 3}), InnerRange(std::vector<int>{4, 5, 6})}}};
Pattern pattern{};
const JWV jwv(std::move(v), std::move(pattern));
ConstIter it = jwv.begin();
std::sentinel_for<ConstIter> decltype(auto) se = jwv.end();
assert(std::ranges::next(it, 6) == se);
}
{ // `const V` and `const Pattern` are not empty
V v{UnderlyingV{std::vector<InnerRange>{
InnerRange(std::vector<int>{1}), InnerRange(std::vector<int>{2, 2}), InnerRange(std::vector<int>{3, 3, 3})}}};
Pattern pattern{std::vector<int>{0}};
const JWV jwv(std::move(v), std::move(pattern));
ConstIter it = jwv.begin();
std::sentinel_for<ConstIter> decltype(auto) se = jwv.end();
assert(std::ranges::next(it, 8) == se);
}
}
}
constexpr bool test() {
[]<std::size_t... Bits>(std::index_sequence<Bits...>) {
(test_end<Bits>(), ...);
(test_const_end<Bits>(), ...);
}(std::make_index_sequence<(1 << 7)>{});
{ // Check situation when iterators returned by `end()` and `end() const` are of the same type
using V = BasicView<std::vector<std::string>, ViewProperties{.simple = true}, forward_iterator>;
using Pattern = BasicView<std::string, ViewProperties{.simple = true}, forward_iterator>;
using JWV = std::ranges::join_with_view<V, Pattern>;
using Sentinel = std::ranges::sentinel_t<JWV&>;
using ConstSentinel = std::ranges::sentinel_t<const JWV&>;
static_assert(std::input_iterator<Sentinel>);
static_assert(std::input_iterator<ConstSentinel>);
static_assert(std::same_as<Sentinel, ConstSentinel>);
}
{ // Check situation when sentinels returned by `end()` and `end() const` are of the same type
using V = BasicView<std::vector<std::string>, ViewProperties{.simple = true, .common = false}, forward_iterator>;
using Pattern = BasicView<std::string, ViewProperties{.simple = true}, forward_iterator>;
using JWV = std::ranges::join_with_view<V, Pattern>;
using Sentinel = std::ranges::sentinel_t<JWV&>;
using ConstSentinel = std::ranges::sentinel_t<const JWV&>;
static_assert(!std::input_iterator<Sentinel>);
static_assert(!std::input_iterator<ConstSentinel>);
static_assert(std::same_as<Sentinel, ConstSentinel>);
}
// Check LWG-4074: compatible-joinable-ranges is underconstrained
static_assert(!JoinWithViewHasConstEnd<BasicVectorView<int, ViewProperties{}, forward_iterator>,
lwg4074::PatternWithProxyConstAccess>);
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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