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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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// This is a compile-only test, so "inline function is not defined" warnings are irrelevant.
// ADDITIONAL_COMPILE_FLAGS(gcc-style-warnings): -Wno-undefined-inline
// template<input_range V, forward_range Pattern>
// requires view<V> && view<Pattern> &&
// indirectly_comparable<iterator_t<V>, iterator_t<Pattern>, ranges::equal_to> &&
// (forward_range<V> || tiny-range<Pattern>)
// class lazy_split_view;
#include <functional>
#include <ranges>
#include "test_iterators.h"
#include "types.h"
struct ForwardRange {
forward_iterator<int*> begin() const;
forward_iterator<int*> end() const;
};
static_assert( std::ranges::forward_range<ForwardRange>);
template <class View, class Pattern>
concept CanInstantiate = requires {
typename std::ranges::lazy_split_view<View, Pattern>;
};
// All constraints satisfied (`View` and `Pattern` are forward views).
namespace test1 {
using View = ForwardView;
using Pattern = ForwardView;
static_assert( std::ranges::forward_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert( CanInstantiate<View, Pattern>);
} // namespace test1
// All constraints satisfied (`View` is an input view and `Pattern` is a tiny view).
namespace test2 {
using View = InputView;
using Pattern = ForwardTinyView;
static_assert( std::ranges::input_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert( CanInstantiate<View, Pattern>);
} // namespace test2
// `View` is not an input range.
namespace test3 {
struct AlmostInputIterator {
using value_type = char;
using difference_type = std::ptrdiff_t;
using iterator_concept = int;
constexpr const char& operator*() const;
constexpr AlmostInputIterator& operator++();
constexpr void operator++(int);
constexpr bool operator==(const AlmostInputIterator&) const;
};
static_assert( std::input_or_output_iterator<AlmostInputIterator>);
static_assert(!std::input_iterator<AlmostInputIterator>);
struct NonInputView : std::ranges::view_base {
AlmostInputIterator begin() const;
AlmostInputIterator end() const;
};
using View = NonInputView;
using Pattern = ForwardTinyView;
static_assert(!std::ranges::input_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test3
// `View` is not a view.
namespace test4 {
using View = ForwardRange;
using Pattern = ForwardView;
static_assert( std::ranges::input_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
static_assert(!std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test4
// `Pattern` is not a forward range.
namespace test5 {
using View = ForwardView;
using Pattern = InputView;
static_assert( std::ranges::input_range<View>);
static_assert(!std::ranges::forward_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test5
// Not indirectly comparable.
namespace test6 {
struct Empty{};
struct IntForwardView : std::ranges::view_base {
constexpr forward_iterator<Empty*> begin() const { return {}; }
constexpr forward_iterator<Empty*> end() const { return {}; }
};
using View = ForwardView;
using Pattern = IntForwardView;
static_assert( std::ranges::input_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert(!std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test6
// `View` is an input range and `Pattern` is not a tiny range.
namespace test7 {
using View = InputView;
using Pattern = ForwardView;
static_assert( std::ranges::input_range<View>);
static_assert(!std::ranges::forward_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
LIBCPP_STATIC_ASSERT(!std::ranges::__tiny_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test7
// `View` is an input range and `Pattern` is almost a tiny range, except the `size()` function is not `constexpr`.
namespace test8 {
struct AlmostTinyRange : std::ranges::view_base {
int* begin() const;
int* end() const;
static std::size_t size() { return 1; }
};
using View = InputView;
using Pattern = AlmostTinyRange;
static_assert( std::ranges::input_range<View>);
static_assert(!std::ranges::forward_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
LIBCPP_STATIC_ASSERT(!std::ranges::__tiny_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test8
// `View` is an input range and `Pattern` is almost a tiny range, except the `size()` returns a number `>2`.
namespace test9 {
struct AlmostTinyRange : std::ranges::view_base {
int* begin() const;
int* end() const;
constexpr static std::size_t size() { return 2; }
};
using View = InputView;
using Pattern = ForwardView;
static_assert( std::ranges::input_range<View>);
static_assert(!std::ranges::forward_range<View>);
static_assert( std::ranges::forward_range<Pattern>);
LIBCPP_STATIC_ASSERT(!std::ranges::__tiny_range<Pattern>);
static_assert( std::ranges::view<View>);
static_assert( std::ranges::view<Pattern>);
static_assert( std::indirectly_comparable<
std::ranges::iterator_t<View>, std::ranges::iterator_t<Pattern>, std::ranges::equal_to>);
static_assert(!CanInstantiate<View, Pattern>);
} // namespace test9
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