Typename Parameter as a Return Type

Templates are not just for defining the types of parameters. A powerful feature of templates is that the return type of a function can also depend on the template parameter. This gives you the flexibility to create generic functions with return types that adjust based on the template type provided.

main


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#include <iostream>

template<typename T> 
T MyFirstTemplateReturn() 
{
	// Returning a default-initialized value of type T
	return T{};
}

int main() 
{
    // Call the template with the void type
    std::cout << typeid(MyFirstTemplateReturn<void>()).name() << std::endl;
}

In the example above, the function's return type is defined by the template parameter T. When we specify void as the type, the compiler interprets it accordingly.

Opgave

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Create a simple template that returns the passed value

Write a simple template function called GetValue.
Use the template's typename parameter as the return type.
Add a parameter to the template function with the same type as the return type.
Return the function's parameter.

Løsning

solution

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder

Var alt klart?

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Sektion 2. Kapitel 1

Typename Parameter as a Return Type

main


              1234567891011121314
            
#include <iostream>

template<typename T> 
T MyFirstTemplateReturn() 
{
	// Returning a default-initialized value of type T
	return T{};
}

int main() 
{
    // Call the template with the void type
    std::cout << typeid(MyFirstTemplateReturn<void>()).name() << std::endl;
}

In the example above, the function's return type is defined by the template parameter T. When we specify void as the type, the compiler interprets it accordingly.

Opgave

Swipe to start coding

Create a simple template that returns the passed value

Write a simple template function called GetValue.
Use the template's typename parameter as the return type.
Add a parameter to the template function with the same type as the return type.
Return the function's parameter.

Løsning

solution

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder

Var alt klart?

Tak for dine kommentarer!

Sektion 2. Kapitel 1

Skift til skrivebord for at øve i den virkelige verdenFortsæt der, hvor du er, med en af nedenstående muligheder