How to pass arguments to a callback in Erlang?

Question

I have a function that does some logic then runs a success callback function or a fail callback function.

Here is the code:

some_function() ->
    ArgumentsForCallback = [],
    check_some_condition(Input, fun success_callback/1, fun fail_callback/1).

How do I pass ArgumentsForCallback to the callbacks?

Can you please post the source of check_some_condition? Does it call the callback functions with 0 arguments? — Dogbert
– Dogbert, Commented Aug 5, 2016 at 8:44
You are right, callback functions are called without arguments which seems to be a wrong way. Should I pass arguments to check_some_condition and then call callback functions with them from inside check_some_condition function? — Sergei Basharov
– Sergei Basharov, Commented Aug 5, 2016 at 8:48

Dogbert · Accepted Answer · 2016-08-05 08:56:50Z

7

There are two ways:

Pass the argument to check_some_condition and make that function send the argument to the callbacks:

check_some_condition(Input, ArgumentsForCallback, Success, Fail) ->
    Success(ArgumentsForCallback).

some_function() ->
    ArgumentsForCallback = [],
    check_some_condition(Input, ArgumentsForCallback, fun success_callback/1, fun fail_callback/1).

Send anonymous functions to check_some_condition:

check_some_condition(Input,
    fun() -> success_callback(ArgumentsForCallback) end,
    fun() -> fail_callback(ArgumentsForCallback) end).

answered Aug 5, 2016 at 8:56

Dogbert

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