e53c461bf3
Note that this class was called just `split_view` in the original One Ranges Proposal and was renamed to `lazy_split_view` by [P2210](https://wg21.link/p2210). Co-authored-by: zoecarver <z.zoelec2@gmail.com> Differential Revision: https://reviews.llvm.org/D107500
90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// UNSUPPORTED: libcpp-has-no-incomplete-ranges
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// friend constexpr bool operator==(const outer-iterator& x, const outer-iterator& y)
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// requires forward_range<Base>;
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//
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// friend constexpr bool operator==(const outer-iterator& x, default_sentinel_t);
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#include <ranges>
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#include <concepts>
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#include <string_view>
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#include "../types.h"
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template <class Iter>
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concept CanCallEquals = requires(const Iter& i) {
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i == i;
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i != i;
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};
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constexpr bool test() {
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// Forward range supports both overloads of `operator==`.
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{
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// outer-iterator == outer-iterator
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{
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SplitViewForward v("abc def", " ");
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auto b = v.begin(), e = v.end();
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assert(b == b);
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assert(!(b != b));
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assert(e == e);
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assert(!(e != e));
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assert(!(b == e));
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assert(b != e);
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}
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// outer-iterator == default_sentinel
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{
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SplitViewForward v("abc def", " ");
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auto b = v.begin(), e = v.end();
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assert(!(b == std::default_sentinel));
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assert(b != std::default_sentinel);
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assert(e == std::default_sentinel);
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assert(!(e != std::default_sentinel));
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}
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// Default-constructed `outer-iterator`s compare equal.
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{
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OuterIterForward i1, i2;
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assert(i1 == i2);
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assert(!(i1 != i2));
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}
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}
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// Input range only supports comparing an `outer-iterator` to the default sentinel.
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{
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using namespace std::string_view_literals;
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SplitViewInput v("abc def"sv, ' ');
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auto b = v.begin();
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std::same_as<std::default_sentinel_t> decltype(auto) e = v.end();
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static_assert(!CanCallEquals<decltype(b)>);
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assert(!(b == std::default_sentinel));
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assert(b != std::default_sentinel);
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assert(!(b == e));
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assert(b != e);
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}
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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