Initializer list won't work

[dusty rover]

void MessageHandler::setCallbackFn(std::function<void(char*)> callbackFn) : callbackFn(callbackFn) 
{
}

MessageHandler::setCallbackFn is a private member function.
There is a private member called callbackFn.
Why won't this initializer list work? It is being recognized as invalid syntax.

[pearl rover]

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[rancid dew]

Member initializer lists are only a thing for constructors

[dusty rover]

Oh, okay

!solved

[pearl rover]

[SOLVED] Initializer list won't work

[pearl rover]

Initializer list won't work