scoped_ptr.h

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#pragma once
 
#include <stddef.h>
#include <stdint.h>
 
#include "fl/namespace.h"
// #include "fl/warn.h"
 
namespace fl {
 
template <typename T> struct ArrayDeleter {
    ArrayDeleter() = default;
    void operator()(T *ptr) { delete[] ptr; }
};
 
template <typename T> struct PointerDeleter {
    void operator()(T *ptr) { delete ptr; }
};
 
template <typename T, typename Deleter = PointerDeleter<T>> class scoped_ptr {
  public:
    // Constructor
    explicit scoped_ptr(T *ptr = nullptr, Deleter deleter = Deleter())
        : ptr_(ptr), deleter_(deleter) {}
 
    // Destructor
    ~scoped_ptr() { deleter_(ptr_); }
 
    // Disable copy semantics (no copying allowed)
    scoped_ptr(const scoped_ptr &) = delete;
    scoped_ptr &operator=(const scoped_ptr &) = delete;
 
    // Move constructor
    scoped_ptr(scoped_ptr &&other) noexcept
        : ptr_(other.ptr_), deleter_(other.deleter_) {
        other.ptr_ = nullptr;
        other.deleter_ = {};
    }
 
    // // Move assignment operator
    // scoped_ptr &operator=(scoped_ptr &&other) noexcept {
    //     if (this != &other) {
    //         reset(other.ptr_);
    //         deleter_ = other.deleter_;
    //         other.ptr_ = nullptr;
    //         other.deleter_ = {};
    //     }
    //     return *this;
    // }
 
    // Access the managed object
    T *operator->() const { return ptr_; }
 
    // Dereference the managed object
    T &operator*() const { return *ptr_; }
 
    // Get the raw pointer
    T *get() const { return ptr_; }
 
    // Boolean conversion operator
    explicit operator bool() const noexcept { return ptr_ != nullptr; }
 
    // Logical NOT operator
    bool operator!() const noexcept { return ptr_ == nullptr; }
 
    // Release the managed object and reset the pointer
    void reset(T *ptr = nullptr) {
        if (ptr_ != ptr) {
            deleter_(ptr_);
            ptr_ = ptr;
        }
    }
 
    T *release() {
        T *tmp = ptr_;
        ptr_ = nullptr;
        return tmp;
    }
 
    void swap(scoped_ptr &other) noexcept {
        T *tmp = ptr_;
        ptr_ = other.ptr_;
        other.ptr_ = tmp;
    }
 
  private:
    T *ptr_;          // Managed pointer
    Deleter deleter_; // Custom deleter
};
 
template <typename T, typename Deleter = ArrayDeleter<T>> class scoped_array {
  public:
    // Constructor
    explicit scoped_array(T *arr = nullptr) : arr_(arr) {}
    scoped_array(T *arr, Deleter deleter) : arr_(arr), deleter_(deleter) {}
 
    // Destructor
    ~scoped_array() { deleter_(arr_); }
 
    // Disable copy semantics (no copying allowed)
    scoped_array(const scoped_array &) = delete;
    scoped_array &operator=(const scoped_array &) = delete;
 
    // Move constructor
    scoped_array(scoped_array &&other) noexcept
        : arr_(other.arr_), deleter_(other.deleter_) {
        other.arr_ = nullptr;
        other.deleter_ = {};
    }
 
    // Move assignment operator
    scoped_array &operator=(scoped_array &&other) noexcept {
        if (this != &other) {
            reset(other.arr_);
            other.arr_ = nullptr;
        }
        return *this;
    }
 
    // Array subscript operator
    T &operator[](size_t i) const { return arr_[i]; }
 
    // Get the raw pointer
    T *get() const { return arr_; }
 
    // Boolean conversion operator
    explicit operator bool() const noexcept { return arr_ != nullptr; }
 
    // Logical NOT operator
    bool operator!() const noexcept { return arr_ == nullptr; }
 
    // Release the managed array and reset the pointer
    void reset(T *arr = nullptr) {
        if (arr_ == arr) {
            return;
        }
        deleter_(arr_);
        arr_ = arr;
    }
 
    void clear() { reset(); }
 
    T *release() {
        T *tmp = arr_;
        arr_ = nullptr;
        return tmp;
    }
 
    void swap(scoped_array &other) noexcept {
        T *tmp = arr_;
        arr_ = other.arr_;
        other.arr_ = tmp;
    }
 
  private:
    T *arr_; // Managed array pointer
    Deleter deleter_ = {};
};
 
} // namespace fl