CODEWITHSUNDEEP
c++
theorist
theorist

Reputation: 169

easy and portable ping pong communication

is there a way to implement such a communication in C++?

use case:

my main program calls a function of my external library to process a list. every time the function iterates through the list it sends a ping to the caller. the latter uses the received signal to track progress of the former and sends back a boolean pong [true: okay, move on; false: the user wants to abort the process, return now].

will this be more efficient than iterating through the list in the main program and let the function only process a single item? or the whole idea is just crap?

Upvotes: 0

Views: 534

Answers (3)

Alexandre C.
Alexandre C.

Reputation: 56976

Perhaps you should use boost::signal. This is at least as good as using callback functions.

Upvotes: 0

Hans Passant
Hans Passant

Reputation: 942050

Sounds to me like you are talking about a callback function. A function pointer:

typedef bool (* Callback)(int mumble);

void processList(Callback notify) {
    while (processingList) {
        if (!notify(42)) break;
        // etc..
    }
}

Upvotes: 1

ezpz
ezpz

Reputation: 12047

If it is the whole list you are processing, why not just use a return value from the function call to indicate when the iteration is complete. If you want to continue, call the function again - if not, dont.

Upvotes: 0

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