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// Copyright 2023 The Tint 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
//
// http://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 "src/tint/utils/slice.h"
#include "gmock/gmock.h"
namespace tint::utils {
namespace {
class C0 : public Castable<C0> {};
class C1 : public Castable<C1, C0> {};
class C2a : public Castable<C2a, C1> {};
class C2b : public Castable<C2b, C1> {};
////////////////////////////////////////////////////////////////////////////////
// Static asserts
////////////////////////////////////////////////////////////////////////////////
// Non-pointer
static_assert(CanReinterpretSlice<ReinterpretMode::kSafe, int, int>, "same type");
static_assert(CanReinterpretSlice<ReinterpretMode::kSafe, int const, int>, "apply const");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, int, int const>, "remove const");
// Non-castable pointers
static_assert(CanReinterpretSlice<ReinterpretMode::kSafe, int* const, int*>, "apply ptr const");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, int*, int* const>, "remove ptr const");
static_assert(CanReinterpretSlice<ReinterpretMode::kSafe, int const*, int*>, "apply el const");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, int*, int const*>, "remove el const");
// Castable
static_assert(CanReinterpretSlice<ReinterpretMode::kSafe, const C0*, C0*>, "apply const");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, C0*, const C0*>, "remove const");
static_assert(CanReinterpretSlice<ReinterpretMode::kSafe, C0*, C1*>, "up cast");
static_assert(CanReinterpretSlice<ReinterpretMode::kSafe, const C0*, const C1*>, "up cast");
static_assert(CanReinterpretSlice<ReinterpretMode::kSafe, const C0*, C1*>, "up cast, apply const");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, C0*, const C1*>,
"up cast, remove const");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, C1*, C0*>, "down cast");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, const C1*, const C0*>, "down cast");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, const C1*, C0*>,
"down cast, apply const");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, C1*, const C0*>,
"down cast, remove const");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, const C1*, C0*>,
"down cast, apply const");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, C1*, const C0*>,
"down cast, remove const");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, C2a*, C2b*>, "sideways cast");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, const C2a*, const C2b*>,
"sideways cast");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, const C2a*, C2b*>,
"sideways cast, apply const");
static_assert(!CanReinterpretSlice<ReinterpretMode::kSafe, C2a*, const C2b*>,
"sideways cast, remove const");
TEST(TintSliceTest, Ctor) {
Slice<int> slice;
EXPECT_EQ(slice.data, nullptr);
EXPECT_EQ(slice.len, 0u);
EXPECT_EQ(slice.cap, 0u);
EXPECT_TRUE(slice.IsEmpty());
}
TEST(TintSliceTest, CtorCast) {
C1* elements[3];
Slice<C1*> slice_a;
slice_a.data = &elements[0];
slice_a.len = 3;
slice_a.cap = 3;
Slice<const C0*> slice_b(slice_a);
EXPECT_EQ(slice_b.data, Bitcast<const C0**>(&elements[0]));
EXPECT_EQ(slice_b.len, 3u);
EXPECT_EQ(slice_b.cap, 3u);
EXPECT_FALSE(slice_b.IsEmpty());
}
TEST(TintSliceTest, CtorEmpty) {
Slice<int> slice{Empty};
EXPECT_EQ(slice.data, nullptr);
EXPECT_EQ(slice.len, 0u);
EXPECT_EQ(slice.cap, 0u);
EXPECT_TRUE(slice.IsEmpty());
}
TEST(TintSliceTest, CtorCArray) {
int elements[] = {1, 2, 3};
auto slice = Slice{elements};
EXPECT_EQ(slice.data, elements);
EXPECT_EQ(slice.len, 3u);
EXPECT_EQ(slice.cap, 3u);
EXPECT_FALSE(slice.IsEmpty());
}
TEST(TintSliceTest, Index) {
int elements[] = {1, 2, 3};
auto slice = Slice{elements};
EXPECT_EQ(slice[0], 1);
EXPECT_EQ(slice[1], 2);
EXPECT_EQ(slice[2], 3);
}
TEST(TintSliceTest, Front) {
int elements[] = {1, 2, 3};
auto slice = Slice{elements};
EXPECT_EQ(slice.Front(), 1);
}
TEST(TintSliceTest, Back) {
int elements[] = {1, 2, 3};
auto slice = Slice{elements};
EXPECT_EQ(slice.Back(), 3);
}
TEST(TintSliceTest, BeginEnd) {
int elements[] = {1, 2, 3};
auto slice = Slice{elements};
EXPECT_THAT(slice, testing::ElementsAre(1, 2, 3));
}
TEST(TintSliceTest, ReverseBeginEnd) {
int elements[] = {1, 2, 3};
auto slice = Slice{elements};
size_t i = 0;
for (auto it = slice.rbegin(); it != slice.rend(); it++) {
EXPECT_EQ(*it, elements[2 - i]);
i++;
}
}
TEST(TintSliceTest, Offset) {
int elements[] = {1, 2, 3};
auto slice = Slice{elements};
auto offset = slice.Offset(1);
EXPECT_EQ(offset.Length(), 2u);
EXPECT_EQ(offset[0], 2);
EXPECT_EQ(offset[1], 3);
}
TEST(TintSliceTest, Offset_PastEnd) {
int elements[] = {1, 2, 3};
auto slice = Slice{elements};
auto offset = slice.Offset(4);
EXPECT_EQ(offset.Length(), 0u);
}
TEST(TintSliceTest, Truncate) {
int elements[] = {1, 2, 3};
auto slice = Slice{elements};
auto truncated = slice.Truncate(2);
EXPECT_EQ(truncated.Length(), 2u);
EXPECT_EQ(truncated[0], 1);
EXPECT_EQ(truncated[1], 2);
}
TEST(TintSliceTest, Truncate_PastEnd) {
int elements[] = {1, 2, 3};
auto slice = Slice{elements};
auto truncated = slice.Truncate(4);
EXPECT_EQ(truncated.Length(), 3u);
EXPECT_EQ(truncated[0], 1);
EXPECT_EQ(truncated[1], 2);
EXPECT_EQ(truncated[2], 3);
}
} // namespace
} // namespace tint::utils