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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.

cpp

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.

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Create a simple template that returns the passed value

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

Løsning

cpp

solution

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book
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.

cpp

main

copy

              
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.

Oppgave

Swipe to start coding

Create a simple template that returns the passed value

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

Løsning

cpp

solution

Switch to desktopBytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor
Alt var klart?

Hvordan kan vi forbedre det?

Takk for tilbakemeldingene dine!

Seksjon 2. Kapittel 1
Switch to desktopBytt til skrivebordet for virkelighetspraksisFortsett der du er med et av alternativene nedenfor
Vi beklager at noe gikk galt. Hva skjedde?
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