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Unreal Development Kit Game Programming with UnrealScript: Beginner's Guide

You're reading from   Unreal Development Kit Game Programming with UnrealScript: Beginner's Guide Create games beyond your imagination with the Unreal Development Kit

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Product type Paperback
Published in Dec 2011
Publisher Packt
ISBN-13 9781849691925
Length 466 pages
Edition 1st Edition
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Author (1):
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Rachel Cordone Rachel Cordone
Author Profile Icon Rachel Cordone
Rachel Cordone
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Table of Contents (18) Chapters Close

Unreal Development Kit Game Programming with UnrealScript
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Project Setup and Test Environments FREE CHAPTER 2. Storing and Manipulating Data 3. Understanding the Class Tree 4. Making Custom Classes 5. Using Functions 6. Using States to Control Behavior 7. Working with Kismet 8. Creating Multiplayer Games 9. Debugging and Optimization 10. Odds and Ends Pop Quiz Answers Index

Time for action – Out parameters


Passing parameters to functions lets us do things with the values that are passed, but what if we need to modify the variables themselves and pass them back? For this we would use out parameters.

  1. Let's change the DoSomething function in our AwesomeEnemySpawner class:

    function DoSomething(out float MyFloat, out int MyInt)
    {
        MyFloat = 5.0;
        MyInt = 18;
    }

    We've declared two out parameters, one int, and one float. In the function we change their values, and that's it.

  2. Now let's rewrite our PostBeginPlay function to call it:

    function PostBeginPlay()
    {
        local float MyF;
        local int MyI;
    
        super.PostBeginPlay();
    
        DoSomething(MyF, MyI);
        `log(MyF @ MyI);
    }

    We'll use two local variables, and then call DoSomething using them. Afterward we'll log their values.

  3. Compile the code and test. Now let's look at the log:

    [0004.54] ScriptLog: 5.0000 18
  4. It's important to remember that the values aren't passed back to the function that called us unless our parameters...

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