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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, c++20
// <ranges>
// chunk_by_view() requires std::default_initializable<View> &&
// std::default_initializable<Pred> = default;
#include <ranges>
#include <cassert>
#include <type_traits>
constexpr int buff[] = {-2, 1, -1, 2};
struct DefaultConstructibleView : std::ranges::view_base {
DefaultConstructibleView() = default;
constexpr int const* begin() const { return buff; }
constexpr int const* end() const { return buff + 4; }
};
struct DefaultConstructiblePredicate {
DefaultConstructiblePredicate() = default;
constexpr bool operator()(int x, int y) const { return x != -y; }
};
struct NoDefaultView : std::ranges::view_base {
NoDefaultView() = delete;
int* begin() const;
int* end() const;
};
struct NoDefaultPredicate {
NoDefaultPredicate() = delete;
constexpr bool operator()(int, int) const;
};
struct NoexceptView : std::ranges::view_base {
NoexceptView() noexcept;
int const* begin() const;
int const* end() const;
};
struct NoexceptPredicate {
NoexceptPredicate() noexcept;
bool operator()(int, int) const;
};
struct MayThrowView : std::ranges::view_base {
MayThrowView() noexcept(false);
int const* begin() const;
int const* end() const;
};
struct MayThrowPredicate {
MayThrowPredicate() noexcept(false);
bool operator()(int, int) const;
};
constexpr void compareRanges(std::ranges::subrange<const int*> v, std::initializer_list<int> list) {
assert(v.size() == list.size());
for (size_t i = 0; i < v.size(); ++i) {
assert(v[i] == list.begin()[i]);
}
}
constexpr bool test() {
// Check default constructor with default initialization
{
using View = std::ranges::chunk_by_view<DefaultConstructibleView, DefaultConstructiblePredicate>;
View view;
auto it = view.begin(), end = view.end();
compareRanges(*it++, {-2, 1});
compareRanges(*it++, {-1, 2});
assert(it == end);
}
// Check default construction with copy-list-initialization
{
using View = std::ranges::chunk_by_view<DefaultConstructibleView, DefaultConstructiblePredicate>;
View view = {};
auto it = view.begin(), end = view.end();
compareRanges(*it++, {-2, 1});
compareRanges(*it++, {-1, 2});
assert(it == end);
}
// Check cases where the default constructor isn't provided
{
static_assert(
!std::is_default_constructible_v<std::ranges::chunk_by_view<NoDefaultView, DefaultConstructiblePredicate>>);
static_assert(
!std::is_default_constructible_v<std::ranges::chunk_by_view<DefaultConstructibleView, NoDefaultPredicate>>);
static_assert(!std::is_default_constructible_v<std::ranges::chunk_by_view<NoDefaultView, NoDefaultPredicate>>);
}
// Check noexcept-ness
{
{
using View = std::ranges::chunk_by_view<MayThrowView, MayThrowPredicate>;
static_assert(!noexcept(View()));
}
{
using View = std::ranges::chunk_by_view<MayThrowView, NoexceptPredicate>;
static_assert(!noexcept(View()));
}
{
using View = std::ranges::chunk_by_view<NoexceptView, MayThrowPredicate>;
static_assert(!noexcept(View()));
}
{
using View = std::ranges::chunk_by_view<NoexceptView, NoexceptPredicate>;
static_assert(noexcept(View()));
}
}
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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