Javascript callback coding style in C?

Question

Ok this question may be shocking for javascript haters and hard-core developers, forgive me!

I love the way I can write a callback function in javascript

var on = function(isTrue, doThis) {if (isTrue) doThis();}

Is there any possibility to replicate the same idea in C ? I know it's type dependent. More and less this is my case:

I have multiple booleans and multiple filters so my use would be, instead of writing

if (thisIs == true) executeThisVoid(passingThisStruct)

I would love to write:

on(thisIs, function(struct){ do this and this})

or simply

on(thisIs, executeThisVoid);

Many thanks everybody.

Yes, but it requires accepting and passing pointers to functions. :( — Gaurav
– Gaurav, Commented Jan 26, 2013 at 22:08
Why is that bad? Could you please elaborate a little bit more? — piggyback
– piggyback, Commented Jan 26, 2013 at 22:09
It's not bad. It's ugly and hard to read compared with Javascript. — Gaurav
– Gaurav, Commented Jan 26, 2013 at 22:10
@Gaurav Meh. It's only hard to read if you're not comfortable with reasonable C usage. IMO callbacks are callbacks; and it's a pretty minor syntactical difference. — Dave Newton
– Dave Newton, Commented Jan 26, 2013 at 22:13
This is a new feature in C++11 called lambdas, unlikely to appear in C. You might find compound statements in GCC an alternative. — Steve-o
– Steve-o, Commented Jan 26, 2013 at 22:39

Gaurav · Accepted Answer · 2013-01-26 22:22:06Z

2

OK, here goes. First define on:

void on(int thisIs, void (*executeThis)(void)) {
    if (thisIs)
        (*executeThis)();
}

Then, define someVoid:

void someVoid(void) {
    /* ... */
}

Then, within another function, call on:

on(1, someVoid);

answered Jan 26, 2013 at 22:22

Gaurav

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Comments

Chen Kinnrot · Accepted Answer · 2013-01-26 22:10:09Z

0

As I know, in C you can point to functions... so, If on is a method that get two function pointers, and thisIs is a function pointer, and executeThisVoid is alos one, you should not have any problems, just need to hold the struct in an outer scope, or create another struct that will represents a chain of method calling(to hold parameters and other stuff).

answered Jan 26, 2013 at 22:10

Chen Kinnrot

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