94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
/*
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* Copyright (C) 2018 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 <gtest/gtest.h>
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#include <utils/Zip2Iterator.h>
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#include <utils/StructureOfArrays.h>
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#include <algorithm>
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#include <array>
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#include <cstdlib>
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#include <stdlib.h>
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using namespace utils;
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TEST(Zip2IteratorTest, sort) {
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using Array = std::array<int, 10>;
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Array values;
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Array keys;
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std::generate(keys.begin(), keys.end(), std::rand);
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std::generate(values.begin(), values.end(), [&values, &keys, n=0]() mutable { return keys[n++]/2; });
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EXPECT_FALSE(std::is_sorted(keys.begin(), keys.end()));
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EXPECT_FALSE(std::is_sorted(values.begin(), values.end()));
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Zip2Iterator<Array::iterator, Array::iterator> b = { values.begin(), keys.begin() };
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Zip2Iterator<Array::iterator, Array::iterator> e = b + values.size();
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std::sort(b, e, [](auto const& lhs, auto const& rhs) { return lhs.second < rhs.second; });
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EXPECT_TRUE(std::is_sorted(keys.begin(), keys.end()));
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EXPECT_TRUE(std::is_sorted(values.begin(), values.end()));
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}
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enum {
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LIGHT_INSTANCE,
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};
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using LightSoa = utils::StructureOfArrays<
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int
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>;
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TEST(Zip2IteratorTest, soa) {
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LightSoa lightData;
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lightData.push_back(3);
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lightData.push_back(2);
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lightData.push_back(1);
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float distances[3] = {1.00f, 0.5f, 0.25f};
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EXPECT_EQ(lightData.size(), 3);
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Zip2Iterator<LightSoa::iterator, float*> z = { lightData.begin(), distances };
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// To sort lightData by distance, we just need to swap the first and third elements.
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// MSVC's std::sort does something akin to the following:
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// using _BidIt = Zip2Iterator<LightSoa::iterator, float*>;
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// const _BidIt _First = z;
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// const _BidIt _Last = z + 2;
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// std::iter_value_t<_BidIt> _Val = std::move(*_First);
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// *_First = std::move(*_Last);
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// *_Last = std::move(_Val);
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std::sort(z, z + lightData.size(),
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[](auto const& lhs, auto const& rhs) { return lhs.second < rhs.second; });
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auto const* instances = lightData.data<LIGHT_INSTANCE>();
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EXPECT_EQ(distances[0], 0.25f);
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EXPECT_EQ(distances[1], 0.5f);
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EXPECT_EQ(distances[2], 1.0f);
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EXPECT_EQ(instances[0], 1);
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EXPECT_EQ(instances[1], 2);
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EXPECT_EQ(instances[2], 3);
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}
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