7.2. Macros

Macros allow you to write abbreviations of Erlang constructs that the Erlang Preprocessor (EPP) expands at compile time. You can use macros to make programs more readable and to implement features outside the language itself. With conditional macros, it becomes possible to write programs that can be customized in different ways, switching between debugging and production modes or among different architectures.

7.2.1. Simple Macros

The simplest macro can be used to define a constant, as in: