How can I pass a Mojo function as an input to another Mojo function?

[humphrey-and-the-machine]

I'd like to create a struct that whose init takes a Mojo function as an input, and the input function will be used to perform some calculations by other methods in the struct. I haven't managed to find a suitable Mojo Type to initialise the variable to which the function will be assigned.

[Brian-M-J]

I think you're looking for something like this?

@value
struct FuncyStruct:
    var func: fn (Int) -> Int

    fn calc(self, num: Int) -> Int:
        return self.func(num)


fn add_1(num: Int) -> Int:
    return num + 1


fn main():
    var a = FuncyStruct(add_1)
    print(a.calc(6))  # Prints 7

[humphrey-and-the-machine]

This is exactly what I needed; many thanks!