User-Defined Attributes (UDA)
Explore how to assign and use user-defined attributes in the D programming language. Understand their compile-time role, how to access them using __traits, and apply these concepts to control program behavior dynamically.
We'll cover the following...
Introduction
Any declaration (e.g., struct type, class type, variable, etc.) can be assigned attributes, which can then be accessed at compile time to alter the way the code is compiled. User-defined attributes are purely a compile-time feature.
The user-defined attribute syntax consists of the @ sign followed by the attribute and appears before the declaration that it is being assigned to. For example, the following code assigns the Encrypted attribute to the declaration of name:
@Encrypted string name;
Multiple attributes can be specified separately or as a parenthesized list of ...