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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>
// template<class R, class P>
// join_with_view(R&&, P&&) -> join_with_view<views::all_t<R>, views::all_t<P>>;
//
// template<input_range R>
// join_with_view(R&&, range_value_t<range_reference_t<R>>)
// -> join_with_view<views::all_t<R>, single_view<range_value_t<range_reference_t<R>>>>;
#include <ranges>
#include <deque>
#include <type_traits>
#include "test_iterators.h"
struct View : std::ranges::view_base {
using It = cpp20_input_iterator<std::deque<int>*>;
View() = default;
It begin() const;
sentinel_wrapper<It> end() const;
};
static_assert(std::ranges::input_range<View>);
static_assert(std::ranges::view<View>);
struct Pattern : std::ranges::view_base {
Pattern() = default;
forward_iterator<int*> begin();
forward_iterator<int*> end();
};
static_assert(std::ranges::forward_range<Pattern>);
static_assert(std::ranges::view<Pattern>);
// A range that is not a view
struct Range {
using It = cpp20_input_iterator<std::deque<int>*>;
Range() = default;
It begin() const;
sentinel_wrapper<It> end() const;
};
static_assert(std::ranges::input_range<Range>);
static_assert(!std::ranges::view<Range>);
// A pattern that is not a view
struct RangePattern {
RangePattern() = default;
forward_iterator<int*> begin();
forward_iterator<int*> end();
};
static_assert(std::ranges::forward_range<RangePattern>);
static_assert(!std::ranges::view<RangePattern>);
void test_range_and_pattern_deduction_guide() {
{ // Both `v` and `pat` model `std::ranges::view`.
{
View v;
Pattern pat;
std::ranges::join_with_view view(v, pat);
static_assert(std::is_same_v<decltype(view), std::ranges::join_with_view<View, Pattern>>);
}
{
View v;
std::ranges::join_with_view view(v, Pattern{});
static_assert(std::is_same_v<decltype(view), std::ranges::join_with_view<View, Pattern>>);
}
{
Pattern pat;
std::ranges::join_with_view view(View{}, pat);
static_assert(std::is_same_v<decltype(view), std::ranges::join_with_view<View, Pattern>>);
}
{
std::ranges::join_with_view view(View{}, Pattern{});
static_assert(std::is_same_v<decltype(view), std::ranges::join_with_view<View, Pattern>>);
}
}
{ // Only `pat` models `std::ranges::view`.
{
Range v;
Pattern pat;
std::ranges::join_with_view view(v, pat);
static_assert(std::is_same_v<decltype(view), std::ranges::join_with_view<std::ranges::ref_view<Range>, Pattern>>);
}
{
Range v;
std::ranges::join_with_view view(v, Pattern{});
static_assert(std::is_same_v<decltype(view), std::ranges::join_with_view<std::ranges::ref_view<Range>, Pattern>>);
}
{
Pattern pat;
std::ranges::join_with_view view(Range{}, pat);
static_assert(
std::is_same_v<decltype(view), std::ranges::join_with_view<std::ranges::owning_view<Range>, Pattern>>);
}
{
std::ranges::join_with_view view(Range{}, Pattern{});
static_assert(
std::is_same_v<decltype(view), std::ranges::join_with_view<std::ranges::owning_view<Range>, Pattern>>);
}
}
{ // Only `v` models `std::ranges::view`.
{
View v;
RangePattern pat;
std::ranges::join_with_view view(v, pat);
static_assert(
std::is_same_v<decltype(view), std::ranges::join_with_view<View, std::ranges::ref_view<RangePattern>>>);
}
{
View v;
std::ranges::join_with_view view(v, RangePattern{});
static_assert(
std::is_same_v<decltype(view), std::ranges::join_with_view<View, std::ranges::owning_view<RangePattern>>>);
}
{
RangePattern pat;
std::ranges::join_with_view view(View{}, pat);
static_assert(
std::is_same_v<decltype(view), std::ranges::join_with_view<View, std::ranges::ref_view<RangePattern>>>);
}
{
std::ranges::join_with_view view(View{}, RangePattern{});
static_assert(
std::is_same_v<decltype(view), std::ranges::join_with_view<View, std::ranges::owning_view<RangePattern>>>);
}
}
{ // Both `v` and `pat` don't model `std::ranges::view`.
{
Range r;
RangePattern pat;
std::ranges::join_with_view view(r, pat);
static_assert(std::is_same_v<
decltype(view),
std::ranges::join_with_view<std::ranges::ref_view<Range>, std::ranges::ref_view<RangePattern>>>);
}
{
Range r;
std::ranges::join_with_view view(r, RangePattern{});
static_assert(std::is_same_v<
decltype(view),
std::ranges::join_with_view<std::ranges::ref_view<Range>, std::ranges::owning_view<RangePattern>>>);
}
{
RangePattern pat;
std::ranges::join_with_view view(Range{}, pat);
static_assert(std::is_same_v<
decltype(view),
std::ranges::join_with_view<std::ranges::owning_view<Range>, std::ranges::ref_view<RangePattern>>>);
}
{
std::ranges::join_with_view view(Range{}, RangePattern{});
static_assert(
std::is_same_v<
decltype(view),
std::ranges::join_with_view<std::ranges::owning_view<Range>, std::ranges::owning_view<RangePattern>>>);
}
}
}
void test_range_and_element_deduction_guide() {
{ // Element is lvalue
int elem = 0;
{
View v;
std::ranges::join_with_view view(v, elem);
static_assert(std::is_same_v<decltype(view), std::ranges::join_with_view<View, std::ranges::single_view<int>>>);
}
{
std::ranges::join_with_view view(View{}, elem);
static_assert(std::is_same_v<decltype(view), std::ranges::join_with_view<View, std::ranges::single_view<int>>>);
}
{
Range r;
std::ranges::join_with_view view(r, elem);
static_assert(
std::is_same_v<decltype(view),
std::ranges::join_with_view<std::ranges::ref_view<Range>, std::ranges::single_view<int>>>);
}
{
std::ranges::join_with_view view(Range{}, elem);
static_assert(
std::is_same_v<decltype(view),
std::ranges::join_with_view<std::ranges::owning_view<Range>, std::ranges::single_view<int>>>);
}
}
{ // Element is rvalue
{
View v;
std::ranges::join_with_view view(v, 1);
static_assert(std::is_same_v<decltype(view), std::ranges::join_with_view<View, std::ranges::single_view<int>>>);
}
{
std::ranges::join_with_view view(View{}, 1);
static_assert(std::is_same_v<decltype(view), std::ranges::join_with_view<View, std::ranges::single_view<int>>>);
}
{
Range r;
std::ranges::join_with_view view(r, 1);
static_assert(
std::is_same_v<decltype(view),
std::ranges::join_with_view<std::ranges::ref_view<Range>, std::ranges::single_view<int>>>);
}
{
std::ranges::join_with_view view(Range{}, 1);
static_assert(
std::is_same_v<decltype(view),
std::ranges::join_with_view<std::ranges::owning_view<Range>, std::ranges::single_view<int>>>);
}
}
}
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