C2120 when using return in a void slot in Qt C++

Question

When I put return; or return void(); in a regular void method of the C++ class in Qt 5 it compiles ok. When I put it in a slots method the compiler generates the following error:

error C2120: 'void' illegal with all types

Here it is stated, that a return in void is possible: Can I return in void function?

Here it is stated, that since slots are normal C++ functions one may return value, including void, I presume. http://www.qtcentre.org/archive/index.php/t-26724.html

Any ideas why a C2120 is issued under those circumstances?

Which compiler and version is this? Can you reproduce it on an online compiler? — Kyle Strand, Aug 28 '16 at 14:11
Don't worry about it; this question will be closed as off-topic anyway since it's a simple mistake that was easily debugged. — Kyle Strand, Aug 29 '16 at 14:15

score 0 · Accepted Answer · answered Aug 28 '16 at 04:46

0

you can only return void from a void function. For example:

void foo()
{
  return void();
}

else you can return like

void foo()
{
  return;
}

which is void in itself.

as stated in that example, but you cannot return anything else, That is why there is an error.

answered Aug 28 '16 at 04:46

Mukul Chauhan

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The question says that the error is triggered by returning `void`, not "anything else." – Kyle Strand Aug 28 '16 at 04:51

C2120 when using return in a void slot in Qt C++

1 Answers1