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