81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
// Copyright 2021 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://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, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include "pw_containers/wrapped_iterator.h"
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#include <array>
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#include "gtest/gtest.h"
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namespace pw::containers {
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namespace {
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class HalfIterator : public WrappedIterator<HalfIterator, const int*, int> {
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public:
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constexpr HalfIterator(const int* it) : WrappedIterator(it) {}
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int operator*() const { return value() / 2; }
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};
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constexpr std::array<int, 6> kArray{0, 2, 4, 6, 8, 10};
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TEST(WrappedIterator, IterateForwards) {
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int expected = 0;
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for (HalfIterator it(kArray.begin()); it != HalfIterator(kArray.end());
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++it) {
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EXPECT_EQ(*it, expected);
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expected += 1;
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}
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}
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TEST(WrappedIterator, IterateBackwards) {
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HalfIterator it(kArray.end());
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int expected = 5;
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do {
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--it;
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EXPECT_EQ(*it, expected);
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expected -= 1;
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} while (it != HalfIterator(kArray.begin()));
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}
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TEST(WrappedIterator, PostIncrement) {
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HalfIterator it(kArray.begin());
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EXPECT_EQ(it++, HalfIterator(kArray.begin()));
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EXPECT_EQ(it, HalfIterator(kArray.begin() + 1));
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EXPECT_EQ(*it, 1);
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}
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TEST(WrappedIterator, PreIncrement) {
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HalfIterator it(kArray.begin());
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EXPECT_EQ(++it, HalfIterator(kArray.begin() + 1));
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EXPECT_EQ(*it, 1);
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}
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TEST(WrappedIterator, PostDecrement) {
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HalfIterator it(kArray.end());
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EXPECT_EQ(it--, HalfIterator(kArray.end()));
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EXPECT_EQ(it, HalfIterator(kArray.end() - 1));
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EXPECT_EQ(*it, 5);
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}
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TEST(WrappedIterator, PreDecrement) {
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HalfIterator it(kArray.end());
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EXPECT_EQ(--it, HalfIterator(kArray.end() - 1));
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EXPECT_EQ(*it, 5);
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}
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} // namespace
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} // namespace pw::containers
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