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Delegate Syntax C++

I am trying my hand at delegates in Unreal for the first time and I just cannot seem to get the syntax right. Any help would be greatly appreciated, thank you.

Class1.h

DECLARE_MULTICAST_DELEGATE(ON_LANGUAGE_CHANGE);

Class1

{
private:

                 ON_LANGUAGE_CHANGE LanguageChangeDelegate;

}

Class1 cpp

void Class1::AFunction(FString target)

{

 LanguageChangeDelegate.Add(this, &Class2::ADifferentFunctionInClass2, (FString)target);


 if (LanguageChangeDelegate.IsBound())
 {
     LanguageChangeDelegate.Broadcast(target);
 }

}

Product Version: UE 4.12
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asked Feb 11 '17 at 05:48 AM in C++ Programming

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2 answers: sort voted first

Hi KaiL25,

You are using a delegate that doesn't have parameters however you are passing through one. You should use DECLARE_MULTICAST_DELEGATE_OneParam.

Cheers,

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answered Feb 11 '17 at 09:10 AM

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project.gheist
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avatar image Shadowriver Feb 11 '17 at 04:47 PM

Name and then param types, like this

DECLARE_MULTICAST_DELEGATE_OneParam(FOnLanguageChange,FString);

It's not cocde breaker but in UE4 coding style delegates should be named same as structs so FSomethingSomething

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There must be something else I'm missing. I am still getting errors.

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answered Feb 12 '17 at 04:07 AM

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