Left shift in StaticVector::erase(), add tests (#7879)

Source/utils/static_vector.hpp

@@ -71,12 +71,20 @@ public:
 	const T &operator[](std::size_t pos) const { return *data_[pos].ptr(); }
 	T &operator[](std::size_t pos) { return *data_[pos].ptr(); }
 
-	void erase(const T *begin, const T *end)
+	void erase(const T *first, const T *last)
 	{
-		for (const T *it = begin; it < end; ++it) {
-			std::destroy_at(it);
+		if (last == first) return;
+		assert(first >= begin() && last <= end() && first <= last);
+		const auto count = last - first;
+		auto tail = std::move(const_cast<T *>(last), end(), const_cast<T *>(first));
+		std::destroy(tail, end());
+		size_ -= count;
 	}
-		size_ -= end - begin;
+
+	void erase(const T *element)
+	{
+		assert(element >= begin() && element < end());
+		erase(element, element + 1);
 	}
 
 	void pop_back() // NOLINT(readability-identifier-naming)

test/CMakeLists.txt

@@ -36,6 +36,7 @@ set(tests
   tile_properties_test
   timedemo_test
   writehero_test
+  staticvector_test
 )
 set(standalone_tests
   codec_test

test/staticvector_test.cpp

@@ -0,0 +1,168 @@
+#include <cstdlib>
+#include <gtest/gtest.h>
+
+#include "engine/random.hpp"
+#include "utils/static_vector.hpp"
+
+using namespace devilution;
+
+namespace {
+
+constexpr int MAX_SIZE = 32;
+
+TEST(StaticVector, StaticVector_push_back)
+{
+	StaticVector<size_t, MAX_SIZE> container;
+
+	SetRndSeed(testing::UnitTest::GetInstance()->random_seed());
+	size_t size = RandomIntBetween(10, MAX_SIZE);
+
+	for (size_t i = 0; i < size; i++) {
+		container.push_back(i);
+	}
+
+	EXPECT_EQ(container.size(), size);
+	for (size_t i = 0; i < size; i++) {
+		EXPECT_EQ(container[i], i);
+	}
+}
+
+TEST(StaticVector, StaticVector_push_back_full)
+{
+	StaticVector<size_t, MAX_SIZE> container;
+
+	size_t size = MAX_SIZE;
+	for (size_t i = 0; i < size; i++) {
+		container.push_back(i);
+	}
+
+	EXPECT_EQ(container.size(), MAX_SIZE);
+	for (size_t i = 0; i < size; i++) {
+		EXPECT_EQ(container[i], i);
+	}
+
+#ifdef _DEBUG
+	ASSERT_DEATH(container.push_back(size + 1), "");
+#endif
+}
+
+TEST(StaticVector, StaticVector_erase)
+{
+	StaticVector<size_t, MAX_SIZE> container;
+	std::vector<size_t> expected;
+
+	SetRndSeed(testing::UnitTest::GetInstance()->random_seed());
+
+#ifdef _DEBUG
+	ASSERT_DEATH(container.erase(container.begin()), "");
+#endif
+
+	container = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+	expected = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+	container.erase(container.begin());
+	EXPECT_EQ(container.size(), expected.size());
+	for (size_t i = 0; i < container.size(); i++) {
+		EXPECT_EQ(container[i], expected[i]);
+	}
+
+	expected = { 1, 2, 3, 4, 5, 6, 7, 8 };
+	container.erase(container.end() - 1, container.end());
+	EXPECT_EQ(container.size(), expected.size());
+	for (size_t i = 0; i < container.size(); i++) {
+		EXPECT_EQ(container[i], expected[i]);
+	}
+
+	while (!container.empty()) {
+		size_t idx = RandomIntLessThan(static_cast<int32_t>(container.size()));
+		container.erase(container.begin() + idx);
+		expected.erase(expected.begin() + idx);
+		if (container.size() > 0) {
+			EXPECT_EQ(container.size(), expected.size());
+			idx = idx <= 1 ? 0 : idx - 1;
+			EXPECT_EQ(container[idx], expected[idx]);
+			idx = (idx + 1) >= container.size() ? container.size() - 1 : idx + 1;
+			EXPECT_EQ(container[idx], expected[idx]);
+		}
+	}
+	EXPECT_EQ(container.size(), 0);
+
+#ifdef _DEBUG
+	ASSERT_DEATH(container.erase(container.begin(), container.end() + 1), "");
+	ASSERT_DEATH(container.erase(container.begin() - 1, container.end()), "");
+#endif
+}
+
+TEST(StaticVector, StaticVector_erase_random)
+{
+	StaticVector<size_t, MAX_SIZE> container;
+	std::vector<size_t> expected;
+
+	SetRndSeed(testing::UnitTest::GetInstance()->random_seed());
+	size_t size = RandomIntBetween(10, MAX_SIZE);
+	size_t erasures = RandomIntBetween(1, static_cast<int32_t>(size) - 1, true);
+
+	for (size_t i = 0; i < size; i++) {
+		container.push_back(i);
+		expected.push_back(i);
+	}
+
+	while (erasures-- > 0) {
+		size_t idx = RandomIntLessThan(static_cast<int32_t>(container.size()));
+		container.erase(container.begin() + idx);
+		expected.erase(expected.begin() + idx);
+	}
+
+	EXPECT_EQ(container.size(), expected.size());
+	for (size_t i = 0; i < expected.size(); i++) {
+		EXPECT_EQ(container[i], expected[i]);
+	}
+}
+
+TEST(StaticVector, StaticVector_erase_range)
+{
+	StaticVector<size_t, MAX_SIZE> container;
+	std::vector<size_t> erase_idx;
+	std::vector<size_t> expected;
+
+	SetRndSeed(testing::UnitTest::GetInstance()->random_seed());
+
+	container = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+	expected = { 3, 4, 5, 6, 7, 8, 9 };
+	container.erase(container.begin(), container.begin() + 3);
+	EXPECT_EQ(container.size(), expected.size());
+	for (size_t i = 0; i < container.size(); i++) {
+		EXPECT_EQ(container[i], expected[i]);
+	}
+
+	container.erase(container.begin() + 1, container.begin() + 1);
+	EXPECT_EQ(container.size(), expected.size());
+	for (size_t i = 0; i < container.size(); i++) {
+		EXPECT_EQ(container[i], expected[i]);
+	}
+
+	int32_t from = RandomIntBetween(0, static_cast<int32_t>(container.size()) - 1);
+	int32_t to = RandomIntBetween(from + 1, static_cast<int32_t>(container.size()));
+	container.erase(container.begin() + from, container.begin() + to);
+	for (int32_t i = to - from; i > 0; i--) {
+		expected.erase(expected.begin() + from);
+	}
+
+	EXPECT_EQ(container.size(), expected.size());
+	for (size_t i = 0; i < container.size(); i++) {
+		EXPECT_EQ(container[i], expected[i]);
+	}
+}
+
+TEST(StaticVector, StaticVector_clear)
+{
+	StaticVector<size_t, MAX_SIZE> container;
+
+	container.clear();
+	EXPECT_EQ(container.size(), 0);
+
+	container = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+	container.clear();
+	EXPECT_EQ(container.size(), 0);
+}
+
+} // namespace