76 lines
2.4 KiB
C++
76 lines
2.4 KiB
C++
/*
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* Copyright 2022 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/non_null.h>
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#include <gtest/gtest.h>
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#include <memory>
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#include <string>
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#include <string_view>
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namespace android::test {
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namespace {
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void get_length(const ftl::NonNull<std::shared_ptr<std::string>>& string_ptr,
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ftl::NonNull<std::size_t*> length_ptr) {
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// No need for `nullptr` checks.
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*length_ptr = string_ptr->length();
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}
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using Pair = std::pair<ftl::NonNull<std::shared_ptr<int>>, std::shared_ptr<int>>;
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Pair dupe_if(ftl::NonNull<std::unique_ptr<int>> non_null_ptr, bool condition) {
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// Move the underlying pointer out, so `non_null_ptr` must not be accessed after this point.
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auto unique_ptr = std::move(non_null_ptr).take();
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auto non_null_shared_ptr = ftl::as_non_null(std::shared_ptr<int>(std::move(unique_ptr)));
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auto nullable_shared_ptr = condition ? non_null_shared_ptr.get() : nullptr;
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return {std::move(non_null_shared_ptr), std::move(nullable_shared_ptr)};
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}
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} // namespace
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// Keep in sync with example usage in header file.
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TEST(NonNull, Example) {
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const auto string_ptr = ftl::as_non_null(std::make_shared<std::string>("android"));
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std::size_t size;
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get_length(string_ptr, ftl::as_non_null(&size));
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EXPECT_EQ(size, 7u);
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auto ptr = ftl::as_non_null(std::make_unique<int>(42));
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const auto [ptr1, ptr2] = dupe_if(std::move(ptr), true);
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EXPECT_EQ(ptr1.get(), ptr2);
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}
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namespace {
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constexpr std::string_view kApple = "apple";
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constexpr std::string_view kOrange = "orange";
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using StringViewPtr = ftl::NonNull<const std::string_view*>;
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constexpr StringViewPtr kApplePtr = ftl::as_non_null(&kApple);
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constexpr StringViewPtr kOrangePtr = ftl::as_non_null(&kOrange);
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constexpr StringViewPtr longest(StringViewPtr ptr1, StringViewPtr ptr2) {
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return ptr1->length() > ptr2->length() ? ptr1 : ptr2;
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}
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static_assert(longest(kApplePtr, kOrangePtr) == kOrangePtr);
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} // namespace
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} // namespace android::test
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