
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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Question
please implement the move assignment operator and move constructor.

Transcribed Image Text:```cpp
#include <iostream>
template <typename T>
class CS30Vector {
public:
// Constructs a vector size num
CS30Vector(int num) {/*Implementation not shown*/}
CS30Vector() {/*Implementation not shown*/}
// your code will go here
// additional member functions not shown
private:
T *arr=nullptr; // used to point to dynamic array
int size; // number of elements in array
};
void foo (CS30Vector<int> v){/*Implementation not shown*/}
int main ( )
{
CS30Vector<int> l1{6};
CS30Vector<int> l2;
// uses move assignment operator
l2 = std::move(l1);
// uses move constructor below
foo(CS30Vector<int>(3));
return 0;
}
```
### Explanation:
In this C++ code snippet, you have a templated class `CS30Vector<T>` designed to represent a vector with dynamic memory management. Below is a breakdown of the key components:
- **Template Definition**: The class is templated to allow flexibility with different data types (`<typename T>`).
- **Constructors**:
- `CS30Vector(int num)`: Constructor that initializes a vector of size `num`. The implementation is not shown.
- `CS30Vector()`: Default constructor with the implementation not shown.
- **Private Members**:
- `T *arr=nullptr;`: A pointer to the dynamic array, initialized to `nullptr`.
- `int size;`: Stores the number of elements in the array.
- **Function `foo`**: This function accepts a vector of integers and has an implementation that is not shown in the snippet.
- **Main Function**:
- Creates an instance `l1` of type `CS30Vector<int>` with size `6`.
- Declares another instance `l2`.
- Uses the move assignment operator to transfer resources from `l1` to `l2` using `std::move`.
- Demonstrates the move constructor by passing a temporary `CS30Vector<int>` object to the `foo` function.
This exercise aims to implement move assignment operator and move constructor functionalities, which efficiently transfer ownership of resources, crucial for optimizing performance in resource management.
Expert Solution

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Step 1
Move assignment operator:
CS30Vector& operator=(CS30Vector&& other) noexcept
{
std::cout << "In operator=(CS30Vector&&). length = "
<< other._length << "." << std::endl;
if (this != &other)
{
// Free the existing resource.
delete[] _data;
// From source object, copy the data pointer and its length
_data = other._data;
_length = other._length;
// Release the data pointer from the source object so that
// the destructor does not free the memory multiple times.
other._data = nullptr;
other._length = 0;
}
return *this;
}
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