Structural Class: Difference between revisions
>Samacado A lot of pages linked to it so I wrote an article on it. I don't like calling is a structural class. |
>Emess No edit summary |
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No structural classes can be created in the game, sub-classes of them can be. | No structural classes can be created in the game, sub-classes of them can be. | ||
For example; the objects [[Part]], [[ | For example; the objects [[Part]], [[TrussPart]], and [[WedgePart]] all inherit their properties from the structural class [[BasePart]]; and all of the GUI objects inherit their properties and methods from [[GuiBase]]. | ||
They are used to create objects, that while similar, play different roles. A [[ | They are used to create objects, that while similar, play different roles. A [[TrussPart]] and a [[Part]] are quite similar in concept, and would require all of the same methods and properties, but are slightly divergent. | ||
<pre> | <pre> | ||
| Line 12: | Line 12: | ||
Part | Part | ||
WedgePart | WedgePart | ||
TrussPart | |||
GuiBase | GuiBase | ||
ScreenGui | ScreenGui | ||
| Line 18: | Line 18: | ||
TextButton | TextButton | ||
</pre> | </pre> | ||
{{Example| | {{Example| | ||
Using the [[ | Using the [[IsA]] method, we can demonstrate the concept of superclasses. | ||
<pre> | <pre> | ||
wedge = Instance.new("WedgePart") | wedge = Instance.new("WedgePart")) | ||
print(wedge: | print(wedge:IsA("BasePart")) | ||
print(wedge: | print(wedge:IsA("WedgePart")) | ||
print(wedge: | print(wedge:IsA("Part")) | ||
print(wedge: | print(wedge:IsA("Instance")) | ||
</pre> | </pre> | ||
would result in | would result in | ||
Latest revision as of 03:40, 18 February 2011
A structural class (in the context of ROBLOX), or superclass is an object which is not actually used or possible to instantiate in-game, but is used as the basis from which certain other objects to inherit certain properties, events, and methods. All global properties are inherited from Instance, and then further structural classes exist.
No structural classes can be created in the game, sub-classes of them can be.
For example; the objects Part, TrussPart, and WedgePart all inherit their properties from the structural class BasePart; and all of the GUI objects inherit their properties and methods from GuiBase.
They are used to create objects, that while similar, play different roles. A TrussPart and a Part are quite similar in concept, and would require all of the same methods and properties, but are slightly divergent.
Instance
BasePart
Part
WedgePart
TrussPart
GuiBase
ScreenGui
ImageLabel
TextButton
Using the IsA method, we can demonstrate the concept of superclasses.
wedge = Instance.new("WedgePart"))
print(wedge:IsA("BasePart"))
print(wedge:IsA("WedgePart"))
print(wedge:IsA("Part"))
print(wedge:IsA("Instance"))
would result in
true true false true
WedgePart and Part share the same structural class BasePart, and are thus both considered to be BaseParts. WedgePart is also obviously a WedgePart, but it is important to note that WedgePart is not also a Part, just because of their shared ancestry. Additionally, all objects in ROBLOX inherit their properties from Instance, and thus all objects are considered to be an Instance.
