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C++ Programming Tutorials - function Templates Video Lecture | Learn to Program with C++: Beginner to Expert - Back-End Programming

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FAQs on C++ Programming Tutorials - function Templates Video Lecture - Learn to Program with C++: Beginner to Expert - Back-End Programming

1. What is a function template in C++ programming?
Ans. A function template in C++ programming is a blueprint for creating a family of functions that can operate on different data types. It allows us to define a single function template that can be used for multiple data types without writing duplicate code.
2. How to define a function template in C++?
Ans. To define a function template in C++, you need to use the "template" keyword followed by the template parameter list, which specifies the data types that the template can work with. For example: ``` template <typename T> T add(T a, T b) { return a + b; } ``` This defines a function template called "add" that can add two values of the same data type.
3. How to use a function template in C++?
Ans. To use a function template in C++, you can simply call the function with the desired data types as arguments. The compiler will automatically generate the appropriate function based on the template definition. For example: ``` int result1 = add(5, 10); // calling add function with integers float result2 = add(3.14, 2.71); // calling add function with floats ``` In the above code, the compiler will generate two different versions of the "add" function based on the data types used.
4. Can function templates have multiple template parameters in C++?
Ans. Yes, function templates in C++ can have multiple template parameters. You can specify multiple template parameters by separating them with commas in the template parameter list. For example: ``` template <typename T, typename U> T multiply(T a, U b) { return a * b; } ``` In the above code, the function template "multiply" has two template parameters, "T" and "U", representing different data types.
5. Can function templates have default template arguments in C++?
Ans. Yes, function templates in C++ can have default template arguments. You can provide default values for template parameters by using the assignment operator (=) followed by the desired default value. For example: ``` template <typename T = int> T square(T num) { return num * num; } ``` In the above code, the function template "square" has a default template argument of "int", so if no data type is explicitly specified, it will use "int" as the default data type.
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