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Learning C++ by creating games with UE4

You're reading from   Learning C++ by creating games with UE4 Learn C++ programming with a fun, real-world application that allows you to create your own games!

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Product type Paperback
Published in Feb 2015
Publisher
ISBN-13 9781784396572
Length 342 pages
Edition 1st Edition
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Author (1):
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William Sherif William Sherif
Author Profile Icon William Sherif
William Sherif
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Table of Contents (14) Chapters Close

Preface 1. Coding with C++ FREE CHAPTER 2. Variables and Memory 3. If, Else, and Switch 4. Looping 5. Functions and Macros 6. Objects, Classes, and Inheritance 7. Dynamic Memory Allocation 8. Actors and Pawns 9. Templates and Commonly Used Containers 10. Inventory System and Pickup Items 11. Monsters 12. Spell Book Index

TMap<T, S>

A TMap<T, S> creates a table of sorts in the RAM. A TMap represents a mapping of the keys at the left to the values on the right-hand side. You can visualize a TMap as a two-column table, with keys in the left column and values in the right column.

A list of items for the player's inventory

For example, say we wanted to create a C++ data structure in order to store a list of items for the player's inventory. On the left-hand side of the table (the keys), we'd have an FString for the item's name. On the right-hand side (the values), we'd have an int for the quantity of that item.

Item (Key)

Quantity (Value)

apples

4

donuts

12

swords

1

shields

2

To do this in code, we'd simply use the following:

TMap<FString, int> items;
items.Add( "apples", 4 );
items.Add( "donuts", 12 );
items.Add( "swords", 1 );
items.Add( "shields", 2 );

Once you have created your TMap, you can access values inside...

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