Is this executing something or saying something? What is it called? Void result(qstring data);

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Is this executing something or saying something? What is it called?
void result(QString data);

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Is this executing something or saying something? What is it called?
void result(QString data);

Posted 5-Dec-20 12:28pm

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Updated 5-Dec-20 19:56pm

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Richard MacCutchan 6-Dec-20 3:40am

Still not learned C/C++ then?

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Shao Voon Wong · Accepted Answer · 2020-12-05T14:49:00

Solution 1

This is function declaration. It is not 'doing anything'.

C++

void result(QString data);

This is an example of calling the result function.

C++

QString data = "Hello World";
result(data);

Posted 5-Dec-20 14:49pm

Shao Voon Wong

OriginalGriff · Accepted Answer · 2020-12-05T19:56:00

It's a function declaration that is used either in a header file to provide the signature for external functions (i.e. not in this file, but in another or in a library) so it can be called from your code; or to give the signature for a function before the actual definition of the function so it can be used by other functions (this is known as a forward declaration).

For example, if you have two functions that call each other:

C++

void A()
   {
   B();
   }
void B()
   {
   A();
   }

Then you need at least one forward declaration (of B) or it's signature is not known when it is first called.