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84bcf84 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | // Copyright 2023 The Abseil 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 "absl/base/nullability.h"
#include <cassert>
#include <memory>
#include <utility>
#include "gtest/gtest.h"
#include "absl/base/attributes.h"
namespace {
using ::absl::Nonnull;
using ::absl::NullabilityUnknown;
using ::absl::Nullable;
void funcWithNonnullArg(Nonnull<int*> /*arg*/) {}
template <typename T>
void funcWithDeducedNonnullArg(Nonnull<T*> /*arg*/) {}
TEST(NonnullTest, NonnullArgument) {
int var = 0;
funcWithNonnullArg(&var);
funcWithDeducedNonnullArg(&var);
}
Nonnull<int*> funcWithNonnullReturn() {
static int var = 0;
return &var;
}
TEST(NonnullTest, NonnullReturn) {
auto var = funcWithNonnullReturn();
(void)var;
}
TEST(PassThroughTest, PassesThroughRawPointerToInt) {
EXPECT_TRUE((std::is_same<Nonnull<int*>, int*>::value));
EXPECT_TRUE((std::is_same<Nullable<int*>, int*>::value));
EXPECT_TRUE((std::is_same<NullabilityUnknown<int*>, int*>::value));
}
TEST(PassThroughTest, PassesThroughRawPointerToVoid) {
EXPECT_TRUE((std::is_same<Nonnull<void*>, void*>::value));
EXPECT_TRUE((std::is_same<Nullable<void*>, void*>::value));
EXPECT_TRUE((std::is_same<NullabilityUnknown<void*>, void*>::value));
}
TEST(PassThroughTest, PassesThroughUniquePointerToInt) {
using T = std::unique_ptr<int>;
EXPECT_TRUE((std::is_same<Nonnull<T>, T>::value));
EXPECT_TRUE((std::is_same<Nullable<T>, T>::value));
EXPECT_TRUE((std::is_same<NullabilityUnknown<T>, T>::value));
}
TEST(PassThroughTest, PassesThroughSharedPointerToInt) {
using T = std::shared_ptr<int>;
EXPECT_TRUE((std::is_same<Nonnull<T>, T>::value));
EXPECT_TRUE((std::is_same<Nullable<T>, T>::value));
EXPECT_TRUE((std::is_same<NullabilityUnknown<T>, T>::value));
}
TEST(PassThroughTest, PassesThroughSharedPointerToVoid) {
using T = std::shared_ptr<void>;
EXPECT_TRUE((std::is_same<Nonnull<T>, T>::value));
EXPECT_TRUE((std::is_same<Nullable<T>, T>::value));
EXPECT_TRUE((std::is_same<NullabilityUnknown<T>, T>::value));
}
TEST(PassThroughTest, PassesThroughPointerToMemberObject) {
using T = decltype(&std::pair<int, int>::first);
EXPECT_TRUE((std::is_same<Nonnull<T>, T>::value));
EXPECT_TRUE((std::is_same<Nullable<T>, T>::value));
EXPECT_TRUE((std::is_same<NullabilityUnknown<T>, T>::value));
}
TEST(PassThroughTest, PassesThroughPointerToMemberFunction) {
using T = decltype(&std::unique_ptr<int>::reset);
EXPECT_TRUE((std::is_same<Nonnull<T>, T>::value));
EXPECT_TRUE((std::is_same<Nullable<T>, T>::value));
EXPECT_TRUE((std::is_same<NullabilityUnknown<T>, T>::value));
}
} // namespace
// Nullable ADL lookup test
namespace util {
// Helper for NullableAdlTest. Returns true, denoting that argument-dependent
// lookup found this implementation of DidAdlWin. Must be in namespace
// util itself, not a nested anonymous namespace.
template <typename T>
bool DidAdlWin(T*) {
return true;
}
// Because this type is defined in namespace util, an unqualified call to
// DidAdlWin with a pointer to MakeAdlWin will find the above implementation.
struct MakeAdlWin {};
} // namespace util
namespace {
// Returns false, denoting that ADL did not inspect namespace util. If it
// had, the better match (T*) above would have won out over the (...) here.
bool DidAdlWin(...) { return false; }
TEST(NullableAdlTest, NullableAddsNothingToArgumentDependentLookup) {
// Treatment: util::Nullable<int*> contributes nothing to ADL because
// int* itself doesn't.
EXPECT_FALSE(DidAdlWin((int*)nullptr));
EXPECT_FALSE(DidAdlWin((Nullable<int*>)nullptr));
// Control: Argument-dependent lookup does find the implementation in
// namespace util when the underlying pointee type resides there.
EXPECT_TRUE(DidAdlWin((util::MakeAdlWin*)nullptr));
EXPECT_TRUE(DidAdlWin((Nullable<util::MakeAdlWin*>)nullptr));
}
} // namespace
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