42 Lecture

1. What is a class template in C++? a. A class that is used to create multiple instances of a class b. A class that can be used with multiple data types c. A class that is used to define a single data type d. A class that cannot be instantiated

Answer: b

2. How do you declare a class template in C++? a. By using the keyword "class" followed by the template parameter list and the class declaration b. By using the keyword "template" followed by the template parameter list and the class declaration c. By using the keyword "typedef" followed by the template parameter list and the class declaration d. By using the keyword "typename" followed by the template parameter list and the class declaration

Answer: b

3. What is the purpose of a template parameter in a class template? a. To represent a data type that can be used by the class b. To represent a constant value that can be used by the class c. To define the size of the class d. To determine the access level of the class members

Answer: a

4. How do you instantiate a class template in C++? a. By defining a new class with the same template parameters as the original class b. By creating an object of the class with the desired data type as the template argument c. By using the keyword "using" followed by the name of the class template d. By using the keyword "typename" followed by the name of the class template

Answer: b

5. How does template specialization work in class templates? a. It allows you to create a specialized version of the class for a specific data type or value b. It allows you to define a new template parameter for the class c. It allows you to restrict the data types that can be used with the class d. It allows you to override the default implementation of the class

Answer: a

6. How do you define member functions for a class template in C++? a. By defining the functions outside the class definition b. By defining the functions inside the class definition c. By using the keyword "template" before the function definition d. By using the keyword "typename" before the function definition

Answer: b

7. How do you overload a class template in C++? a. By defining a new class with the same name but different template parameters b. By defining a new member function with the same name but different template parameters c. By defining a new member function with a different name but the same template parameters d. By defining a new class with a different name but the same template parameters

Answer: b

8. What are the advantages of using class templates in C++? a. They provide code reusability and improve code quality b. They reduce development time and cost c. They allow for generic programming and flexible data structures d. All of the above

Answer: d

9. What are the potential drawbacks of using class templates in C++? a. They can lead to longer compilation times b. They can be difficult to understand for novice programmers c. They can be prone to errors and bugs d. All of the above

Answer: d

10. Can class templates be used with user-defined data types? a. Yes, as long as the data type is specified as a template parameter b. No, class templates can only be used with built-in data types c. It depends on the complexity of the user-defined data type d. It depends on the implementation of the class template

Answer: a

1. What is a class template in C++? Answer: A class template is a generic class that can work with multiple data types.

2. How do you declare a class template in C++? Answer: You declare a class template using the "template" keyword followed by the template parameter list and the class declaration.

3. What is a template parameter in a class template? Answer: A template parameter is a placeholder for a data type that can be used by the class.

4. How do you instantiate a class template in C++? Answer: You instantiate a class template by creating an object of the class with the desired data type as the template argument.

5. How does template specialization work in class templates? Answer: Template specialization allows you to create a specialized version of the class for a specific data type or value.

6. Can you define member functions for a class template inside the class definition? Answer: Yes, you can define member functions for a class template inside the class definition.

7. How do you overload a class template in C++? Answer: You overload a class template by defining a new member function with the same name but different template parameters.

8. What are the advantages of using class templates in C++? Answer: Class templates provide code reusability, improve code quality, and allow for generic programming and flexible data structures.

9. What are the potential drawbacks of using class templates in C++? Answer: Class templates can lead to longer compilation times, can be difficult to understand for novice programmers, and can be prone to errors and bugs.

10. Can class templates be used with user-defined data types? Answer: Yes, class templates can be used with user-defined data types as long as the data type is specified as a template parameter.

In C++, class templates provide a powerful mechanism for creating generic classes that can work with different data types. A class template is defined using the template keyword followed by the template parameter list, which specifies one or more placeholders for the data types that the class will use. When you create an object of a class template, you must provide a type argument for each template parameter. The compiler uses this information to generate a specialized version of the class for the specified data types. Class templates can have member functions, constructors, and member variables just like regular classes. These functions and variables can be defined inside the class definition or outside it. However, if a member function is defined outside the class definition, it must be preceded by the template keyword and the class name followed by the template argument list. One of the benefits of using class templates is that they allow you to write generic code that can work with different data types. For example, you can create a generic container class that can hold different types of data, such as integers, strings, or custom objects. This can significantly reduce the amount of code you need to write, and can also make your code more flexible and reusable. Another benefit of class templates is that they allow you to use concepts, which are a way of specifying requirements on template arguments. For example, you can specify that a template argument must be a class that has a certain set of member functions or a certain type of data. However, there are also some potential drawbacks to using class templates. One of the main issues is that they can lead to longer compilation times, especially for large projects. Additionally, they can be more difficult to understand for novice programmers, and can be prone to errors and bugs if used incorrectly. Overall, class templates are a powerful tool that can help you write more generic and reusable code in C++. By using them effectively, you can create flexible and efficient data structures that can work with a wide variety of data types.