CODEWITHSUNDEEP
rust
Jose
Jose

Reputation: 53

Is it possible to create an array of functions which returns a value in rust?

So I have several functions in a struct which return a value:

fn a(&mut self) -> u8{
   //Do stuff
   return 0;
}
fn b(z: u8) -> u8{return z;}
fn c(&mut self) -> u8{
   //Do stuff
   return 2;
}

I want to know if there is a way to call a function from an array which can be accessed by other member for functions, so, for example:

static FUNCTIONS: [u8; 3] = [a(), b(some_value), c()];
// OR
let functions: [u8; 3] = [a(), b(some_value), c()];

So in summation, I would like to do something like this:

struct this_struct {
   value:u8
}

impl this_struct {
   // The array of functions could be placed here for member access

   fn a(&mut self) -> u8{
      //Do stuff with value
      return 0;
   }
   fn b(z: u8) -> u8{return z;}
   fn c(&mut self) -> u8{
      //Do stuff with value
      return 2;
   }
}

Basically, I just want to know if there is a way to call a function of a struct from an array in a way which will modify the struct's member variable. Is this possible? If so, how and where should I place the array?

Upvotes: 0

Views: 292

Answers (1)

Luki446
Luki446

Reputation: 161

What you are trying to do here is not an array of functions but an array of functions results. Then you must specify from what struct you use functions ex.

static FUNCTIONS: [u8; 3] = [this_struct::a(), this_struct::b(value), this_struct::c()];

Additionaly in statics you can only use constant functions

impl this_struct {
   const fn a() -> u8{return 0;}
   const fn b(z: u8) -> u8{return z;}
   const fn c() -> u8{return 2;}
}

Upvotes: 1

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