Erlang 18
Erlang 18
  • 请登录查看
字典 我要纠错

9. Preprocessor

9 Preprocessor

9.1 File Inclusion

A file can be included as follows:

-include(File).
-include_lib(File).

File, a string, is to point out a file. The contents of this file are included as is, at the position of the directive.

Include files are typically used for record and macro definitions that are shared by several modules. It is recommended to use the file name extension .hrl for include files.

File can start with a path component $VAR, for some string VAR. If that is the case, the value of the environment variable VAR as returned by os:getenv(VAR) is substituted for $VAR. If os:getenv(VAR) returns false, $