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
103 lines
3.1 KiB
C++
103 lines
3.1 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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// constexpr lazy_split_view(View base, Pattern pattern);
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#include <ranges>
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#include <cassert>
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#include <string_view>
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#include <utility>
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#include "types.h"
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struct ViewWithCounting : std::ranges::view_base {
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int* times_copied = nullptr;
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int* times_moved = nullptr;
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constexpr ViewWithCounting(int& copies_ctr, int& moves_ctr) : times_copied(&copies_ctr), times_moved(&moves_ctr) {}
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constexpr ViewWithCounting(const ViewWithCounting& rhs)
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: times_copied(rhs.times_copied)
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, times_moved(rhs.times_moved) {
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++(*times_copied);
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}
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constexpr ViewWithCounting(ViewWithCounting&& rhs)
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: times_copied(rhs.times_copied)
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, times_moved(rhs.times_moved) {
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++(*times_moved);
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}
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constexpr const char* begin() const { return nullptr; }
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constexpr const char* end() const { return nullptr; }
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constexpr ViewWithCounting& operator=(const ViewWithCounting&) = default;
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constexpr ViewWithCounting& operator=(ViewWithCounting&&) = default;
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constexpr bool operator==(const ViewWithCounting&) const { return true; }
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};
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static_assert(std::ranges::forward_range<ViewWithCounting>);
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static_assert(std::ranges::view<ViewWithCounting>);
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constexpr bool test() {
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// Calling the constructor with `(ForwardView, ForwardView)`.
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{
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CopyableView input = "abc def";
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std::ranges::lazy_split_view<CopyableView, CopyableView> v(input, " ");
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assert(v.base() == input);
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}
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// Calling the constructor with `(InputView, TinyView)`.
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{
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InputView input = "abc def";
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std::ranges::lazy_split_view<InputView, ForwardTinyView> v(input, ' ');
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// Note: `InputView` isn't equality comparable.
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(void)v;
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}
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// Make sure the arguments are moved, not copied.
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{
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using View = ViewWithCounting;
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using Pattern = ViewWithCounting;
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// Arguments are lvalues.
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{
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int view_copied = 0, view_moved = 0, pattern_copied = 0, pattern_moved = 0;
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View view(view_copied, view_moved);
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Pattern pattern(pattern_copied, pattern_moved);
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std::ranges::lazy_split_view<View, Pattern> v(view, pattern);
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assert(view_copied == 1); // The local variable is copied into the argument.
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assert(view_moved == 1);
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assert(pattern_copied == 1);
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assert(pattern_moved == 1);
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}
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// Arguments are rvalues.
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{
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int view_copied = 0, view_moved = 0, pattern_copied = 0, pattern_moved = 0;
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std::ranges::lazy_split_view<View, Pattern> v(
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View(view_copied, view_moved), Pattern(pattern_copied, pattern_moved));
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assert(view_copied == 0);
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assert(view_moved == 1);
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assert(pattern_copied == 0);
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assert(pattern_moved == 1);
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}
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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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