add util::stack_vector

src/util/stack_vector.hpp

@@ -0,0 +1,99 @@
+#pragma once
+
+namespace util {
+    template<typename T, int capacity>
+    class stack_vector {
+    public:
+        stack_vector() : size_(0) {}
+
+        stack_vector(const stack_vector<T, capacity>& other)
+            : size_(other.size_) {
+            for (int i = 0; i < size_; ++i) {
+                new (&data_[i]) T(data_[i]);
+            }
+        }
+
+        stack_vector(stack_vector<T, capacity>&& other) noexcept
+            : size_(other.size_) {
+            for (int i = 0; i < size_; ++i) {
+                new (&data_[i]) T(std::move(other.data_[i]));
+            }
+            other.size_ = 0;
+        }
+
+        stack_vector(const std::initializer_list<T>& init) : size_(0) {
+            static_assert(
+                init.size() <= capacity,
+                "initializer list exceeds stack vector capacity"
+            );
+            for (const auto& value : init) {
+                new (&data_[size_++]) T(value);
+            }
+        }
+
+        ~stack_vector() {
+            clear();
+        }
+
+        void push_back(const T& value) {
+            if (size_ < capacity) {
+                data_[size_++] = value;
+            } else {
+                throw std::overflow_error("stack vector capacity exceeded");
+            }
+        }
+
+        void pop_back() {
+            if (size_ > 0) {
+                data_[size_ - 1].~T();
+                --size_;
+            } else {
+                throw std::underflow_error("stack vector is empty");
+            }
+        }
+
+        void clear() {
+            for (int i = 0; i < size_; ++i) {
+                data_[i].~T();
+            }
+            size_ = 0;
+        }
+
+        T& operator[](int index) {
+            return data_[index];
+        }
+        
+        const T& operator[](int index) const {
+            return data_[index];
+        }
+
+        T& at(int index) {
+            if (index < 0 || index >= size_) {
+                throw std::out_of_range("index out of range");
+            }
+            return data_[index];
+        }
+
+        const T& at(int index) const {
+            if (index < 0 || index >= size_) {
+                throw std::out_of_range("index out of range");
+            }
+            return data_[index];
+        }
+
+        int size() const { 
+            return size_;
+        }
+
+        bool empty() const {
+            return size_ == 0;
+        }
+
+        bool full() const {
+            return size_ == capacity;
+        }
+    private:
+        T data_[capacity];
+        int size_;
+    };
+}