413 lines
11 KiB
C++
413 lines
11 KiB
C++
/*
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* Copyright 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <ftl/small_map.h>
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#include <gtest/gtest.h>
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#include <cctype>
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#include <string>
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using namespace std::string_literals;
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namespace android::test {
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using ftl::SmallMap;
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// Keep in sync with example usage in header file.
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TEST(SmallMap, Example) {
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ftl::SmallMap<int, std::string, 3> map;
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EXPECT_TRUE(map.empty());
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EXPECT_FALSE(map.dynamic());
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map = ftl::init::map<int, std::string>(123, "abc")(-1)(42, 3u, '?');
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EXPECT_EQ(map.size(), 3u);
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EXPECT_FALSE(map.dynamic());
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EXPECT_TRUE(map.contains(123));
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EXPECT_EQ(map.get(42, [](const std::string& s) { return s.size(); }), 3u);
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const auto opt = map.get(-1);
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ASSERT_TRUE(opt);
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std::string& ref = *opt;
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EXPECT_TRUE(ref.empty());
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ref = "xyz";
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map.emplace_or_replace(0, "vanilla", 2u, 3u);
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EXPECT_TRUE(map.dynamic());
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EXPECT_EQ(map, SmallMap(ftl::init::map(-1, "xyz")(0, "nil")(42, "???")(123, "abc")));
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}
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TEST(SmallMap, Construct) {
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{
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// Default constructor.
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SmallMap<int, std::string, 2> map;
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EXPECT_TRUE(map.empty());
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EXPECT_FALSE(map.dynamic());
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}
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{
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// In-place constructor with same types.
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SmallMap<int, std::string, 5> map =
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ftl::init::map<int, std::string>(123, "abc")(456, "def")(789, "ghi");
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EXPECT_EQ(map.size(), 3u);
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EXPECT_EQ(map.max_size(), 5u);
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EXPECT_FALSE(map.dynamic());
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EXPECT_EQ(map, SmallMap(ftl::init::map(123, "abc")(456, "def")(789, "ghi")));
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}
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{
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// In-place constructor with different types.
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SmallMap<int, std::string, 5> map =
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ftl::init::map<int, std::string>(123, "abc")(-1)(42, 3u, '?');
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EXPECT_EQ(map.size(), 3u);
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EXPECT_EQ(map.max_size(), 5u);
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EXPECT_FALSE(map.dynamic());
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EXPECT_EQ(map, SmallMap(ftl::init::map(42, "???")(123, "abc")(-1, "\0\0\0")));
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}
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{
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// In-place constructor with implicit size.
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SmallMap map = ftl::init::map<int, std::string>(123, "abc")(-1)(42, 3u, '?');
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static_assert(std::is_same_v<decltype(map), SmallMap<int, std::string, 3>>);
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EXPECT_EQ(map.size(), 3u);
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EXPECT_EQ(map.max_size(), 3u);
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EXPECT_FALSE(map.dynamic());
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EXPECT_EQ(map, SmallMap(ftl::init::map(-1, "\0\0\0")(42, "???")(123, "abc")));
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}
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}
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TEST(SmallMap, Assign) {
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{
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// Same types; smaller capacity.
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SmallMap map1 = ftl::init::map<char, std::string>('k', "kilo")('M', "mega")('G', "giga");
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const SmallMap map2 = ftl::init::map('T', "tera"s)('P', "peta"s);
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map1 = map2;
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EXPECT_EQ(map1, map2);
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}
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{
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// Convertible types; same capacity.
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SmallMap map1 = ftl::init::map<char, std::string>('M', "mega")('G', "giga");
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const SmallMap map2 = ftl::init::map('T', "tera")('P', "peta");
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map1 = map2;
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EXPECT_EQ(map1, map2);
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}
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{
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// Convertible types; zero capacity.
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SmallMap<char, std::string, 0> map1 = ftl::init::map('M', "mega")('G', "giga");
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const SmallMap<char, std::string, 0> map2 = ftl::init::map('T', "tera")('P', "peta");
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map1 = map2;
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EXPECT_EQ(map1, map2);
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}
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}
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TEST(SmallMap, UniqueKeys) {
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{
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// Duplicate mappings are discarded.
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const SmallMap map = ftl::init::map<int, float>(1)(2)(3)(2)(3)(1)(3)(2)(1);
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EXPECT_EQ(map.size(), 3u);
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EXPECT_EQ(map.max_size(), 9u);
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using Map = decltype(map);
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EXPECT_EQ(map, Map(ftl::init::map(1, 0.f)(2, 0.f)(3, 0.f)));
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}
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{
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// Duplicate mappings may be reordered.
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const SmallMap map = ftl::init::map('a', 'A')(
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'b', 'B')('b')('b')('c', 'C')('a')('d')('c')('e', 'E')('d', 'D')('a')('f', 'F');
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EXPECT_EQ(map.size(), 6u);
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EXPECT_EQ(map.max_size(), 12u);
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using Map = decltype(map);
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EXPECT_EQ(map, Map(ftl::init::map('a', 'A')('b', 'B')('c', 'C')('d', 'D')('e', 'E')('f', 'F')));
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}
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}
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TEST(SmallMap, Find) {
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{
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// Constant reference.
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const SmallMap map = ftl::init::map('a', 'A')('b', 'B')('c', 'C');
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const auto opt = map.get('b');
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EXPECT_EQ(opt, 'B');
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const char d = 'D';
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const auto ref = map.get('d').value_or(std::cref(d));
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EXPECT_EQ(ref.get(), 'D');
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}
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{
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// Mutable reference.
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SmallMap map = ftl::init::map('a', 'A')('b', 'B')('c', 'C');
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const auto opt = map.get('c');
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EXPECT_EQ(opt, 'C');
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char d = 'd';
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const auto ref = map.get('d').value_or(std::ref(d));
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ref.get() = 'D';
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EXPECT_EQ(d, 'D');
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}
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{
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// Constant unary operation.
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const SmallMap map = ftl::init::map('a', 'x')('b', 'y')('c', 'z');
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EXPECT_EQ(map.get('c', [](char c) { return std::toupper(c); }), 'Z');
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}
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{
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// Mutable unary operation.
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SmallMap map = ftl::init::map('a', 'x')('b', 'y')('c', 'z');
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EXPECT_TRUE(map.get('c', [](char& c) { c = std::toupper(c); }));
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EXPECT_EQ(map, SmallMap(ftl::init::map('c', 'Z')('b', 'y')('a', 'x')));
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}
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}
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TEST(SmallMap, TryEmplace) {
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SmallMap<int, std::string, 3> map;
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using Pair = decltype(map)::value_type;
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{
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const auto [it, ok] = map.try_emplace(123, "abc");
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ASSERT_TRUE(ok);
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EXPECT_EQ(*it, Pair(123, "abc"s));
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}
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{
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const auto [it, ok] = map.try_emplace(42, 3u, '?');
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ASSERT_TRUE(ok);
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EXPECT_EQ(*it, Pair(42, "???"s));
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}
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{
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const auto [it, ok] = map.try_emplace(-1);
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ASSERT_TRUE(ok);
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EXPECT_EQ(*it, Pair(-1, std::string()));
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EXPECT_FALSE(map.dynamic());
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}
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{
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// Insertion fails if mapping exists.
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const auto [it, ok] = map.try_emplace(42, "!!!");
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EXPECT_FALSE(ok);
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EXPECT_EQ(*it, Pair(42, "???"));
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EXPECT_FALSE(map.dynamic());
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}
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{
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// Insertion at capacity promotes the map.
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const auto [it, ok] = map.try_emplace(999, "xyz");
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ASSERT_TRUE(ok);
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EXPECT_EQ(*it, Pair(999, "xyz"));
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EXPECT_TRUE(map.dynamic());
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}
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EXPECT_EQ(map, SmallMap(ftl::init::map(-1, ""s)(42, "???"s)(123, "abc"s)(999, "xyz"s)));
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}
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namespace {
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// The mapped type does not require a copy/move assignment operator.
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struct String {
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template <typename... Args>
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String(Args... args) : str(args...) {}
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const std::string str;
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bool operator==(const String& other) const { return other.str == str; }
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};
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} // namespace
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TEST(SmallMap, TryReplace) {
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SmallMap<int, String, 3> map = ftl::init::map(1, "a")(2, "B");
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using Pair = decltype(map)::value_type;
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{
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// Replacing fails unless mapping exists.
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const auto it = map.try_replace(3, "c");
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EXPECT_EQ(it, map.end());
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}
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{
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// Replacement arguments can refer to the replaced mapping.
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const auto ref = map.get(2, [](const auto& s) { return s.str[0]; });
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ASSERT_TRUE(ref);
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// Construct std::string from one character.
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const auto it = map.try_replace(2, 1u, static_cast<char>(std::tolower(*ref)));
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ASSERT_NE(it, map.end());
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EXPECT_EQ(*it, Pair(2, "b"));
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}
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EXPECT_FALSE(map.dynamic());
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EXPECT_TRUE(map.try_emplace(3, "abc").second);
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EXPECT_TRUE(map.try_emplace(4, "d").second);
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EXPECT_TRUE(map.dynamic());
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{
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// Replacing fails unless mapping exists.
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const auto it = map.try_replace(5, "e");
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EXPECT_EQ(it, map.end());
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}
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{
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// Replacement arguments can refer to the replaced mapping.
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const auto ref = map.get(3);
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ASSERT_TRUE(ref);
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// Construct std::string from substring.
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const auto it = map.try_replace(3, ref->get().str, 2u, 1u);
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ASSERT_NE(it, map.end());
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EXPECT_EQ(*it, Pair(3, "c"));
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}
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EXPECT_EQ(map, SmallMap(ftl::init::map(4, "d"s)(3, "c"s)(2, "b"s)(1, "a"s)));
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}
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TEST(SmallMap, EmplaceOrReplace) {
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SmallMap<int, String, 3> map = ftl::init::map(1, "a")(2, "B");
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using Pair = decltype(map)::value_type;
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{
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// New mapping is emplaced.
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const auto [it, emplace] = map.emplace_or_replace(3, "c");
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EXPECT_TRUE(emplace);
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EXPECT_EQ(*it, Pair(3, "c"));
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}
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{
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// Replacement arguments can refer to the replaced mapping.
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const auto ref = map.get(2, [](const auto& s) { return s.str[0]; });
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ASSERT_TRUE(ref);
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// Construct std::string from one character.
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const auto [it, emplace] = map.emplace_or_replace(2, 1u, static_cast<char>(std::tolower(*ref)));
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EXPECT_FALSE(emplace);
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EXPECT_EQ(*it, Pair(2, "b"));
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}
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EXPECT_FALSE(map.dynamic());
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EXPECT_FALSE(map.emplace_or_replace(3, "abc").second); // Replace.
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EXPECT_TRUE(map.emplace_or_replace(4, "d").second); // Emplace.
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EXPECT_TRUE(map.dynamic());
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{
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// New mapping is emplaced.
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const auto [it, emplace] = map.emplace_or_replace(5, "e");
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EXPECT_TRUE(emplace);
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EXPECT_EQ(*it, Pair(5, "e"));
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}
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{
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// Replacement arguments can refer to the replaced mapping.
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const auto ref = map.get(3);
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ASSERT_TRUE(ref);
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// Construct std::string from substring.
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const auto [it, emplace] = map.emplace_or_replace(3, ref->get().str, 2u, 1u);
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EXPECT_FALSE(emplace);
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EXPECT_EQ(*it, Pair(3, "c"));
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}
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EXPECT_EQ(map, SmallMap(ftl::init::map(5, "e"s)(4, "d"s)(3, "c"s)(2, "b"s)(1, "a"s)));
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}
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TEST(SmallMap, Erase) {
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{
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SmallMap map = ftl::init::map(1, '1')(2, '2')(3, '3')(4, '4');
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EXPECT_FALSE(map.dynamic());
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EXPECT_FALSE(map.erase(0)); // Key not found.
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EXPECT_TRUE(map.erase(2));
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EXPECT_EQ(map, SmallMap(ftl::init::map(1, '1')(3, '3')(4, '4')));
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EXPECT_TRUE(map.erase(1));
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EXPECT_EQ(map, SmallMap(ftl::init::map(3, '3')(4, '4')));
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EXPECT_TRUE(map.erase(4));
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EXPECT_EQ(map, SmallMap(ftl::init::map(3, '3')));
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EXPECT_TRUE(map.erase(3));
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EXPECT_FALSE(map.erase(3)); // Key not found.
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EXPECT_TRUE(map.empty());
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EXPECT_FALSE(map.dynamic());
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}
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{
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SmallMap map = ftl::init::map(1, '1')(2, '2')(3, '3');
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map.try_emplace(4, '4');
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EXPECT_TRUE(map.dynamic());
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EXPECT_FALSE(map.erase(0)); // Key not found.
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EXPECT_TRUE(map.erase(2));
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EXPECT_EQ(map, SmallMap(ftl::init::map(1, '1')(3, '3')(4, '4')));
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EXPECT_TRUE(map.erase(1));
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EXPECT_EQ(map, SmallMap(ftl::init::map(3, '3')(4, '4')));
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EXPECT_TRUE(map.erase(4));
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EXPECT_EQ(map, SmallMap(ftl::init::map(3, '3')));
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EXPECT_TRUE(map.erase(3));
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EXPECT_FALSE(map.erase(3)); // Key not found.
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EXPECT_TRUE(map.empty());
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EXPECT_TRUE(map.dynamic());
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}
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}
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TEST(SmallMap, Clear) {
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SmallMap map = ftl::init::map(1, '1')(2, '2')(3, '3');
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map.clear();
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EXPECT_TRUE(map.empty());
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EXPECT_FALSE(map.dynamic());
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map = ftl::init::map(1, '1')(2, '2')(3, '3');
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map.try_emplace(4, '4');
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map.clear();
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EXPECT_TRUE(map.empty());
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EXPECT_TRUE(map.dynamic());
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}
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TEST(SmallMap, KeyEqual) {
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struct KeyEqual {
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bool operator()(int lhs, int rhs) const { return lhs % 10 == rhs % 10; }
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};
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SmallMap<int, char, 1, KeyEqual> map;
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EXPECT_TRUE(map.try_emplace(3, '3').second);
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EXPECT_FALSE(map.try_emplace(13, '3').second);
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EXPECT_TRUE(map.try_emplace(22, '2').second);
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EXPECT_TRUE(map.contains(42));
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EXPECT_TRUE(map.try_emplace(111, '1').second);
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EXPECT_EQ(map.get(321), '1');
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map.erase(123);
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EXPECT_EQ(map, SmallMap(ftl::init::map<int, char, KeyEqual>(1, '1')(2, '2')));
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}
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} // namespace android::test
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