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include "xdp.kh"

type IpAddress = u32

@helper

fn helper_function(value: u32) -> u32 {

return value + 10

}

@helper

fn another_helper() -> u32 {

return 42

}

@xdp fn test_functions(ctx: *xdp_md) -> xdp_action {

var result = helper_function(5)

var const_val = another_helper()

return XDP_PASS

}

fn global_function(x: u32) -> u32 {

return x * 2

}

fn add_numbers(a: i32, b: i32) -> i32 {

return a + b

}

fn multiply_numbers(a: i32, b: i32) -> i32 {

return a * b

}

fn subtract_numbers(a: i32, b: i32) -> i32 {

return a - b

}

fn process_with_callback(x: i32, y: i32, callback: fn(i32, i32) -> i32) -> i32 {

return callback(x, y)

}

// Function pointer type declaration

type BinaryOp = fn(i32, i32) -> i32

fn main() -> i32 {

var result = global_function(21)

// Assign functions to function pointers

var add_op: BinaryOp = add_numbers

var mul_op: BinaryOp = multiply_numbers

var sub_op: BinaryOp = subtract_numbers

// Call functions through function pointers

var sum = add_op(10, 20) // Result: 30

var product = mul_op(5, 6) // Result: 30

var difference = sub_op(15, 7) // Result: 8

// Higher-order function with function pointer parameter

var callback_result = process_with_callback(4, 7, add_numbers) // Result: 11

var callback_result2 = process_with_callback(4, 7, multiply_numbers) // Result: 28

return 0

}

kernelscript/examples/functions.ks at main · multikernel/kernelscript · GitHub

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