[Codeah]

#define is a pre-processor directive. You can read more about it here and here.

To put it in simple words. It replaces A with B in your code :

Код:

#define A B

This happens before the gamemode/filterscript is compiled and only affects lines below the directive.

Here is an example :

Код:

#define SERVER_VERSION "0.00.1"
#define SOME_IDENTIFIER print("Oh, hey there!");
#define foo(%0) print(%0)

public OnGameModeInit()
{
    SOME_IDENTIFIER
    foo("Oh, hey there!");

    SetGameModeText("MyGameMode v" #SERVER_VERSION);
}

Note : When interpolating strings you need to put a number sign/hash (#) before the identifier.