Function templates allow functions to work with multiple data types. A function template defines a generic function using placeholder types that can then be used with different specific types. This improves code reusability and reduces duplication by writing functions that can work across types. The syntax uses the template keyword followed by angle brackets containing the placeholder type names. Function templates can have multiple parameters by specifying multiple placeholder types. They provide advantages like reusability, flexibility, and reduced code duplication.

1. Function Templates and
Multiple Parameters
Name: Bhushan Lilhare
Roll No: 59
Sub: OOPS C++

2. Introduction to Function Templates
Function templates are a powerful feature in C++ that allow you to define generic functions that can work with
different types of data. They provide a flexible and reusable solution to avoid code duplication and increase
productivity.
A function template is a blueprint for creating functions that can operate on multiple types. It allows you to
define a generic function once and use it with different data types without having to rewrite the function for
each specific type.
Purpose of Function Templates
The main purpose of function templates is to improve code reusability and maintainability. By using function
templates, you can write a single function that can be used with different types, eliminating the need to write
multiple versions of the same function for each type.
Function templates also provide a way to implement generic algorithms that can work with different data
types. This allows you to write more generic and flexible code that can be used in a wide range of scenarios.
Overall, function templates are a powerful tool in C++ that help you write generic, reusable, and flexible code,
making your programs more efficient and easier to maintain.

3. Syntax of Function Templates
To declare a function template, you use the template keyword, followed by
the function declaration with a placeholder type. The placeholder type
represents the generic type the function will work with.
When creating a function template, you need to follow a specific syntax. Here's how it looks:
template <typename T>
return_type function_name(parameters) {
// function body
}

4. As you can see, the add function template works with different types, providing code reusability and flexibility.
Now, let's see an example of a function template:
template <typename T>
T add(T a, T b) {
return a + b;
}
In this example, we have defined a function template named add that takes two parameters of
type T and returns the sum of those parameters. The type T can be any valid C++ type, such as
int, double, or even a user-defined class.
Here's how you can use the add function template:
int result1 = add(5, 10); // result1 = 15
double result2 = add(3.14, 2.71); // result2 = 5.85
Example of Function Templates

5. Creating a Function Template with Multiple
Parameters
Function templates can also have multiple parameters. By specifying multiple placeholder types, you can
create functions that operate on different types simultaneously.
The syntax a function template with multiple parameters is as follows:
template <typename T1, typename T2, ...>
return_type function_name(parameter1, parameter2, ...) {
// function body
}

6. Example of a Function Template with Multiple
Parameters
Here's an example that demonstrates how to create a function template with multiple parameters:
template <typename T1, typename T2>
void printValues(T1 value1, T2 value2) {
std::cout << "Value 1: " << value1 << std::endl;
std::cout << "Value 2: " << value2 << std::endl;
}
Here's how you can use the printValues function template:
printValues(10, 3.14); // Output: Value 1: 10 Value 2: 3.14
printValues("Hello", std::string("world")); // Output: Value 1: Hello Value 2:
world

7. Advantages of Using Function
Templates
Reusability and Flexibility
Function templates allow you to write
code that can be reused with different
data types, improving code flexibility and
reducing redundancy.
Reduced Code Duplication
With function templates, you can avoid
writing similar functions for every data
type. This leads to cleaner and more
maintainable code.

8. Conclusion
1 Recap of Key Points
Function templates offer flexibility and
reusability in code, leading to more
efficient programming practices.
2 Importance of Function
Templates in Programming
By utilizing function templates,
developers can save time, enhance
code clarity, and increase overall
productivity.