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Editorial Team
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Asked: 2026-05-21T14:42:17+00:00

I have 2 define: -define(LOGIN_PACKET, 1). -define(LOGOUT_PACKET, 2). An try to: case func(…) of

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I have 2 define:

-define(LOGIN_PACKET, 1).
-define(LOGOUT_PACKET, 2).

An try to:

case func(...) of
   LOGIN_PACKET ->
               .....;
   LOGOUT_PACKET ->
               ......
end

But i get warning:

this clause cannot match because a previous clause at line 209 always matches.

Why? Can we use defines in case of in Erlang.

Thank you.

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1 Answer

  1. Editorial Team

    Do it like below

    case func(...) of
   ?LOGIN_PACKET ->
               .....;
   ?LOGOUT_PACKET ->
               ......
end

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