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How can i use in A class value, to B class in C++


 class A
     float Aspeed;


     Aspeed = 10.f;   



 class B
     float Bspeed;       


     Bspeed =    [ i want to get Aspeed of class A      ]   <- What do i write ????

i want connect two different class.

i can't see example.

could you make simple easy example ?? please....

Product Version: UE 4.12
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asked Sep 23 '16 at 08:24 AM in C++ Programming

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avatar image fabianu Sep 23 '16 at 09:58 AM

There are multiple possible solutions. What do you want to achieve? Then i can give you a better tip.

avatar image psr1331 Sep 26 '16 at 12:23 AM

dear fabianu


i want to get member value of other class.

That class is not parent and child.

i need general example......

connect different other class!!

i'm sorry.. my question range is so large TT_TT

avatar image psr1331 Sep 26 '16 at 12:44 AM

for example

in class A

UStaticMeshComponent* AAA = CreateDefaulSubobject

in class B

I want use value of AAA!!

How to connect???

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3 answers: sort voted first

Hey psr1331-

Inside the .h for class be you will first need to add an include statement for Class A. Once you've done this you can create a variable inside Class B who's type is of Class A (which would look like A MyClassARef). From this variable, as HuntaKiller mentioned, you can then get the specific atribute of class A that you need. In the case of your example it would be BSpeed = MyClassARef.ASpeed. For this to work, ASpeed needs to be declared public inside Class A so that another class can see/use it.


Doug Wilson

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answered Sep 27 '16 at 02:16 PM

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You need to instantiate class A within class B then access the variable you declared. Bspeed = A.Aspeed;

This is a basic function of any programming language, and not to be discouraging but you won't be able to do much in C++ without that basic knowledge. Try sticking to blueprints, which for you should not have any disadvantages compared to trying to do it in C++. There are many UE4 tutorials on YouTube.

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answered Sep 26 '16 at 06:27 PM

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This should work:

 TSubclassOf<A> asd = A::StaticClass();
 Bspeed = asd.GetDefaultObject()->Aspeed;
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answered Sep 27 '16 at 12:42 PM

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