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Defining Types
--------------
.. crowbar:element:: TypeDefinition <- StructDefinition / EnumDefinition / UnionDefinition
Crowbar has three different kinds of user-defined types.
.. crowbar:element:: StructDefinition <- 'struct' identifier '{' VariableDeclaration+ '}' ';'
A ``struct`` defines a composite type with several members.
.. todo::
define struct layout in memory
.. crowbar:element:: EnumDefinition <- 'enum' identifier '{' EnumMember (',' EnumMember)* ','? '}' ';'
EnumMember <- identifier ('=' Expression)?
An ``enum`` defines a type which can take one of several specified values.
.. todo::
define enum value assignment, type-related behavior
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