mpd/test/util/TestIntrusiveList.cxx
2022-11-11 21:11:22 +01:00

263 lines
6.7 KiB
C++

/*
* Copyright 2020-2022 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "util/IntrusiveList.hxx"
#include "util/SortList.hxx"
#include <gtest/gtest.h>
#include <string>
namespace {
template<typename Hook>
struct CharItem final : Hook {
char ch;
constexpr CharItem(char _ch) noexcept:ch(_ch) {}
};
template<typename Hook>
static std::string
ToString(const IntrusiveList<CharItem<Hook>> &list,
typename IntrusiveList<CharItem<Hook>>::const_iterator it,
std::size_t n) noexcept
{
std::string result;
for (std::size_t i = 0; i < n; ++i, ++it)
result.push_back(it == list.end() ? '_' : it->ch);
return result;
}
template<typename Hook>
static std::string
ToStringReverse(const IntrusiveList<CharItem<Hook>> &list,
typename IntrusiveList<CharItem<Hook>>::const_iterator it,
std::size_t n) noexcept
{
std::string result;
for (std::size_t i = 0; i < n; ++i, --it)
result.push_back(it == list.end() ? '_' : it->ch);
return result;
}
} // anonymous namespace
TEST(IntrusiveList, Basic)
{
using Item = CharItem<IntrusiveListHook>;
Item items[]{'a', 'b', 'c'};
IntrusiveList<Item> list;
for (auto &i : items)
list.push_back(i);
ASSERT_EQ(ToString(list, list.begin(), 5), "abc_a");
ASSERT_EQ(ToStringReverse(list, list.begin(), 5), "a_cba");
items[1].unlink();
ASSERT_EQ(ToString(list, list.begin(), 4), "ac_a");
ASSERT_EQ(ToStringReverse(list, list.begin(), 4), "a_ca");
IntrusiveList<Item> other_list;
Item other_items[]{'d', 'e', 'f', 'g'};
for (auto &i : other_items)
other_list.push_back(i);
list.splice(std::next(list.begin()), other_list,
other_list.iterator_to(other_items[1]),
other_list.iterator_to(other_items[3]), 2);
ASSERT_EQ(ToString(other_list, other_list.begin(), 4), "dg_d");
ASSERT_EQ(ToStringReverse(other_list, other_list.begin(), 4), "d_gd");
ASSERT_EQ(ToString(list, list.begin(), 6), "aefc_a");
ASSERT_EQ(ToStringReverse(list, list.begin(), 6), "a_cfea");
}
TEST(IntrusiveList, SafeLink)
{
using Item = CharItem<SafeLinkIntrusiveListHook>;
Item items[]{'a', 'b', 'c'};
for (const auto &i : items)
ASSERT_FALSE(i.is_linked());
IntrusiveList<Item> list;
list.push_back(items[1]);
list.push_back(items[2]);
list.push_front(items[0]);
for (const auto &i : items)
ASSERT_TRUE(i.is_linked());
ASSERT_EQ(ToString(list, list.begin(), 5), "abc_a");
ASSERT_EQ(ToStringReverse(list, list.begin(), 5), "a_cba");
items[1].unlink();
ASSERT_TRUE(items[0].is_linked());
ASSERT_FALSE(items[1].is_linked());
ASSERT_TRUE(items[2].is_linked());
ASSERT_EQ(ToString(list, list.begin(), 4), "ac_a");
ASSERT_EQ(ToStringReverse(list, list.begin(), 4), "a_ca");
list.erase(list.iterator_to(items[0]));
ASSERT_FALSE(items[0].is_linked());
ASSERT_FALSE(items[1].is_linked());
ASSERT_TRUE(items[2].is_linked());
ASSERT_EQ(ToString(list, list.begin(), 3), "c_c");
ASSERT_EQ(ToStringReverse(list, list.begin(), 3), "c_c");
list.clear();
ASSERT_FALSE(items[0].is_linked());
ASSERT_FALSE(items[1].is_linked());
ASSERT_FALSE(items[2].is_linked());
ASSERT_EQ(ToString(list, list.begin(), 2), "__");
ASSERT_EQ(ToStringReverse(list, list.begin(), 2), "__");
{
IntrusiveList<Item> list2;
list2.push_back(items[0]);
ASSERT_TRUE(items[0].is_linked());
}
ASSERT_FALSE(items[0].is_linked());
}
TEST(IntrusiveList, AutoUnlink)
{
using Item = CharItem<AutoUnlinkIntrusiveListHook>;
Item a{'a'};
ASSERT_FALSE(a.is_linked());
IntrusiveList<Item> list;
Item b{'b'};
ASSERT_FALSE(b.is_linked());
{
Item c{'c'};
list.push_back(a);
list.push_back(b);
list.push_back(c);
ASSERT_TRUE(a.is_linked());
ASSERT_TRUE(b.is_linked());
ASSERT_TRUE(c.is_linked());
ASSERT_EQ(ToString(list, list.begin(), 5), "abc_a");
}
ASSERT_EQ(ToString(list, list.begin(), 5), "ab_ab");
ASSERT_TRUE(a.is_linked());
ASSERT_TRUE(b.is_linked());
}
TEST(IntrusiveList, Merge)
{
using Item = CharItem<IntrusiveListHook>;
const auto predicate = [](const Item &a, const Item &b){
return a.ch < b.ch;
};
Item items[]{'c', 'k', 'u'};
IntrusiveList<Item> list;
for (auto &i : items)
list.push_back(i);
IntrusiveList<Item> other_list;
Item other_items[]{'a', 'b', 'g', 'm', 'n', 'x', 'y', 'z'};
for (auto &i : other_items)
other_list.push_back(i);
MergeList(list, other_list, predicate);
ASSERT_EQ(ToString(list, list.begin(), 13), "abcgkmnuxyz_a");
ASSERT_TRUE(other_list.empty());
Item more_items[]{'a', 'o', 'p', 'q'};
for (auto &i : more_items)
other_list.push_back(i);
MergeList(list, other_list, predicate);
ASSERT_EQ(ToString(list, list.begin(), 17), "aabcgkmnopquxyz_a");
ASSERT_EQ(&*list.begin(), &other_items[0]);
ASSERT_EQ(&*std::next(list.begin()), &more_items[0]);
}
TEST(IntrusiveList, Sort)
{
using Item = CharItem<IntrusiveListHook>;
const auto predicate = [](const Item &a, const Item &b){
return a.ch < b.ch;
};
Item items[]{'z', 'a', 'b', 'q', 'b', 'c', 't', 'm', 'y'};
IntrusiveList<Item> list;
SortList(list, predicate);
ASSERT_EQ(ToString(list, list.begin(), 2), "__");
list.push_back(items[0]);
SortList(list, predicate);
ASSERT_EQ(ToString(list, list.begin(), 3), "z_z");
list.push_back(items[1]);
SortList(list, predicate);
ASSERT_EQ(ToString(list, list.begin(), 4), "az_a");
SortList(list, predicate);
ASSERT_EQ(ToString(list, list.begin(), 4), "az_a");
list.clear();
for (auto &i : items)
list.push_back(i);
SortList(list, predicate);
ASSERT_EQ(ToString(list, list.begin(), 11), "abbcmqtyz_a");
ASSERT_EQ(&*std::next(list.begin(), 1), &items[2]);
ASSERT_EQ(&*std::next(list.begin(), 2), &items[4]);
}