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AK: Add Vector::prepend(Vector&&).

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Also included a good boy unit test.
This commit is contained in:
Andreas Kling 2019-07-20 16:10:52 +02:00
parent 26c29e59ec
commit 67654ec529
2 changed files with 58 additions and 0 deletions
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33
AK/Tests/TestVector.cpp
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@ -65,4 +65,37 @@ TEST_CASE(strings_insert_ordered)
EXPECT_EQ(strings[3], "ghi");
}
TEST_CASE(prepend_vector)
{
Vector<int> ints;
ints.append(1);
ints.append(2);
ints.append(3);
Vector<int> more_ints;
more_ints.append(4);
more_ints.append(5);
more_ints.append(6);
ints.prepend(move(more_ints));
EXPECT_EQ(ints.size(), 6);
EXPECT_EQ(more_ints.size(), 0);
EXPECT_EQ(ints[0], 4);
EXPECT_EQ(ints[1], 5);
EXPECT_EQ(ints[2], 6);
EXPECT_EQ(ints[3], 1);
EXPECT_EQ(ints[4], 2);
EXPECT_EQ(ints[5], 3);
ints.prepend(move(more_ints));
EXPECT_EQ(ints.size(), 6);
EXPECT_EQ(more_ints.size(), 0);
more_ints.prepend(move(ints));
EXPECT_EQ(more_ints.size(), 6);
EXPECT_EQ(ints.size(), 0);
}
TEST_MAIN(Vector)

25
AK/Vector.h
View file

@ -349,6 +349,31 @@ public:
++m_size;
}
void prepend(Vector&& other)
{
if (other.is_empty())
return;
if (is_empty()) {
*this = move(other);
return;
}
auto other_size = other.size();
grow_capacity(size() + other_size);
for (int i = size() + other_size - 1; i > other.size(); --i) {
new (slot(i)) T(move(at(i - other_size)));
at(i - other_size).~T();
}
Vector tmp = move(other);
for (int i = 0; i < tmp.size(); ++i)
new (slot(i)) T(move(tmp.at(i)));
m_size += other_size;
}
void append(const T* values, int count)
{
if (!count)