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//===-- Unittests for span ------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/__support/CPP/array.h"
#include "src/__support/CPP/span.h"
#include "test/UnitTest/Test.h"
using LIBC_NAMESPACE::cpp::array;
using LIBC_NAMESPACE::cpp::span;
TEST(LlvmLibcSpanTest, InitializeEmpty) {
span<int> s;
ASSERT_EQ(s.size(), size_t(0));
ASSERT_TRUE(s.empty());
ASSERT_TRUE(s.data() == nullptr);
}
TEST(LlvmLibcSpanTest, InitializeSingleton) {
int a = 42;
span<int> s(&a, 1);
ASSERT_EQ(s.size(), size_t(1));
ASSERT_FALSE(s.empty());
ASSERT_TRUE(s.data() == &a);
ASSERT_EQ(s.front(), 42);
ASSERT_EQ(s.back(), 42);
}
TEST(LlvmLibcSpanTest, InitializeCArray) {
int a[] = {1, 2, 3};
span<int> s(a);
ASSERT_EQ(s.size(), size_t(3));
ASSERT_FALSE(s.empty());
ASSERT_TRUE(s.data() == &a[0]);
ASSERT_EQ(s.front(), 1);
ASSERT_EQ(s.back(), 3);
ASSERT_EQ(s[0], 1);
ASSERT_EQ(s[1], 2);
ASSERT_EQ(s[2], 3);
}
TEST(LlvmLibcSpanTest, InitializeArray) {
array<int, 3> a = {1, 2, 3};
span<int> s(a);
ASSERT_EQ(s.size(), size_t(3));
ASSERT_FALSE(s.empty());
ASSERT_TRUE(s.data() == &a[0]);
ASSERT_EQ(s.front(), 1);
ASSERT_EQ(s.back(), 3);
ASSERT_EQ(s[0], 1);
ASSERT_EQ(s[1], 2);
ASSERT_EQ(s[2], 3);
}
TEST(LlvmLibcSpanTest, InitializeViewFormMutableSingleton) {
int a = 42;
span<const int> s(&a, 1);
ASSERT_EQ(s.size(), size_t(1));
ASSERT_TRUE(s.data() == &a);
}
TEST(LlvmLibcSpanTest, InitializeViewFormMutableCArray) {
int a[] = {1, 2, 3};
span<const int> s(a);
ASSERT_EQ(s.size(), size_t(3));
ASSERT_EQ(s[0], 1);
ASSERT_EQ(s[1], 2);
ASSERT_EQ(s[2], 3);
}
TEST(LlvmLibcSpanTest, InitializeViewFormMutableArray) {
array<int, 3> a = {1, 2, 3};
span<const int> s(a);
ASSERT_EQ(s.size(), size_t(3));
ASSERT_EQ(s[0], 1);
ASSERT_EQ(s[1], 2);
ASSERT_EQ(s[2], 3);
}
TEST(LlvmLibcSpanTest, InitializeFromMutable) {
span<int> s;
span<const int> view(s);
(void)view;
}
TEST(LlvmLibcSpanTest, Assign) {
span<int> s;
span<int> other;
other = s;
}
TEST(LlvmLibcSpanTest, AssignFromMutable) {
span<int> s;
span<const int> view;
view = s;
}
TEST(LlvmLibcSpanTest, Modify) {
int a[] = {1, 2, 3};
span<int> s(a);
for (int &value : s)
++value;
ASSERT_EQ(s.size(), size_t(3));
ASSERT_EQ(s[0], 2);
ASSERT_EQ(s[1], 3);
ASSERT_EQ(s[2], 4);
}
TEST(LlvmLibcSpanTest, SubSpan) {
int a[] = {1, 2, 3};
span<const int> s(a);
{ // same span
const auto _ = s.subspan(0);
ASSERT_EQ(_.size(), size_t(3));
ASSERT_EQ(_[0], 1);
ASSERT_EQ(_[1], 2);
ASSERT_EQ(_[2], 3);
}
{ // last element
const auto _ = s.subspan(2);
ASSERT_EQ(_.size(), size_t(1));
ASSERT_EQ(_[0], 3);
}
{ // no element
const auto _ = s.subspan(3);
ASSERT_EQ(_.size(), size_t(0));
}
{ // first element
const auto _ = s.subspan(0, 1);
ASSERT_EQ(_.size(), size_t(1));
ASSERT_EQ(_[0], 1);
}
}
TEST(LlvmLibcSpanTest, FirstAndLastSubSpan) {
int a[] = {1, 2, 3};
span<const int> s(a);
const auto first = s.first(2);
ASSERT_EQ(first.size(), size_t(2));
ASSERT_EQ(first[0], 1);
ASSERT_EQ(first[1], 2);
const auto last = s.last(2);
ASSERT_EQ(last.size(), size_t(2));
ASSERT_EQ(last[0], 2);
ASSERT_EQ(last[1], 3);
}
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