ActionScript 3 Language Specification

ActionScript 3.0 Language Specification > 3 Phases and dialects of interpretation > 3.2 Verifying > 3.2.1 Compile time constant expressions

3.2.1 Compile time constant expressions

A compile time constant expression is an expression whose value can be determined at compile time (during verification), before any part of the program has been executed. Compile time constant expressions consist of the following sub-expressions:

• Literals such as null, Number, Boolean and String literals
• References to properties whose values are compile-time constants
• Operators whose results can be computed at compile time

Expressions in certain contexts are required to be compile time constant expressions:

• Type annotations
• Inheritance clauses references
• Attributes
• Pragma arguments (for example, use namespace ns2)

Of these, inheritance clause references and attributes must not have forward references.

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